si unit of mechanical energy

Our experts can answer your tough homework and study questions. There is one additional unit of energy encountered in engineering applications. The joule is also the SI unit of work. Learn the mechanical energy definition and characteristics and how mechanical energy compares to kinetic and potential energy. Doing work on an object is a simple concept: we apply a certain force over a certain distance. 1 calIT = 4.1868 J, International Table calorie 1 calth = 4.184 J, thermochemical calorie 1 cal15 ≈ 4.1855 J, calories to heat from 14.5 °C to 15.5 °C 1 erg = 10−7 J, cgs [centimeter-gram-second] unit 1 eV ≈ 1.60218 × 10−19 J, electron volt 1 Eh ≈ 4.35975 × 10−18 J, Hartree, atomic energy unit 1 Btu = 1055.06 J, British thermal unit according to ISO, to heat 1 pound water from 63 °F to 64 °F 1 tce = 29.3076 × 109 J, ton of coal equivalent, 7000 kcalIT 1 toe = 41.868 × 109 J, ton of oil equivalent, 10000 kcalIT Calories and/or k… I left a 60W light bulb on for 30 days, which raised my electric bill by 43.2 kWh (kilowatt-hours). In this lesson, we'll look at the application of balanced and unbalanced forces in Newton's law in order to calculate the acceleration of different objects. It is the macroscopic energy associated with a system. This type of unit exchanges work in two steps: the pressure energy of a high-pressure stream is firstly converted to mechanical energy using an expander (turbine) … A unit of electrical energy equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second. the sum of the kinetic and potential energy of an … These units (cm−1) are strictly speaking not energy units but units proportional to energies, with Found inside – Page 153A Computer Approach (SI Units Version) R. K. Rajput. The internal energy is a function of temperature only and it is a point function. Therefore, for the same two ... Total change in mechanical energy of reversible steady flow process. First the principle of the Conservation of Mechanical Energy was stated:. Found inside – Page 1055Acceleration: the rate of change of an object's velocity; it is a vector quantity: a = Δv Δt (SI units: m/s2). ... Power: The rate at which work is performed, given by P = wt (SI unit: watt = J/s) Mechanical Energy Energy is a scalar ... Is there figurative language in taking sides by Gary Soto. Energy is the capacity to do work. It is just about impossible to function effectively without some internalized system of measurement. In this volume, I outline a history of the science of measurement, and the [2], Learn how and when to remove this template message, relativistic equivalence between mass and energy, Conversion of units of energy, work, or amount of heat, "Appendix B8—Factors for Units Listed Alphabetically", https://en.wikipedia.org/w/index.php?title=Units_of_energy&oldid=1042073802, Articles needing additional references from August 2015, All articles needing additional references, Articles needing additional references from February 2020, Wikipedia articles needing clarification from February 2021, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 September 2021, at 02:42. = Deepen your knowledge of this concept with a free preview of our video lessons, Keep learning with more step-by-step explanations to questions related to this topic. Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. The mechanical energy equation¶ Let’s now consider a more general case involving our conservation of energy equation. Conservation of Linear Momentum: Formula and Examples. Mechanical energy, mechanical energy is the energy due to the position or movement of an object okay. Electromagnetism and electronic induction are also discussed. The text is a primary reference for readers interested in engineering science. Found inside – Page 6Its SI unit is joule (kg m2 s–2). Positive Work Done ❖ Positive work means that force is parallel to displacement, i.e. in the direction of displacement. Negative Work Done ❖ In a heat engine, heat energy changes into mechanical ... 2.2 Units of Energy The basic unit of energy in the metric system is the joule. A short quiz will follow. Unit V: Motion of … Question 8. Workbook Physics Kaushik Narayanan, added an answer, on 9/1/16 SI unit of mechanical energy is joule (J). Horsepower or foot/pounds or pound/feet vs. Joules or Newton/meters or watts? If that's your question then the answer is no. https://physics.nist.g... The factor is to be determined in this experiment. 1 ftlbf = 1.356 joule. Type of stored energy associated with the position of an object in a … Distance (in meters), Energy is usually measured in terms of heat, which is measured ⋅ The joule (J) is the SI (International System) unit used to measure mechanical energy. The total mechanical energy of the wave is the sum of its kinetic energy and potential energy. Energy, is defined as the property that is transferred to an object in order to perform 'work' on the object. Work includes heating as well. Put si... A teacher walks into the Classroom and says If only Yesterday was Tomorrow Today would have been a Saturday Which Day did the Teacher make this Statement? Forces that act on an object can be drawn through special vector diagrams called free-body diagrams. v = velocity of that object. h Thus, between any two points (A and B) in an isolated system, mechanical energy is equal. What SI unit is used to measure mechanical energy? The unit of the different forms of energy like kinetic energy, potential, mechanical … These relationships can be used to convert between the various English system units for the various forms of energy. 81% average accuracy. J or j 1. Edit. ft.lbforce. Will adrenaline give a positive xanthoproteic test? Found inside – Page 16One very important fact about this power transmission is that the output mechanical power is always less than the input level. ... the torque is measured by N· m, the angular velocity is in s-1, and the unit of power is W in SI units. Found inside – Page 82Potential Energy Potential energy is the amount of mechanical energy a body possesses by virtue of its height above the ... The change in gravitational potential energy of the body is given by m т Système International ( SI ) unit of ... 1 kilowatthour (kWh) = 3.6 megajoules (MJ) The unit of power and heat flow rate is the watt (W). In the absence of heat transfer, and assuming negligible … the SI unit of energy. position: … In more fundamental terms, 1 joule is equal to: Mechanical energy is a term used to describe the entire energy of a system, including any potential energies it may possess and kinetic energy, found only in moving objects. In this lesson, you're going to learn about practical applications of work and kinetic energy formulas. The calorie is defined as the amount of thermal energy necessary to raise the temperature of one gram of water by 1 Celsius degree, from a temperature of 14.5 °C, at a pressure of 1 atm. Dimension of energy: Dimension of energy and work is the same, [E] = [ML2T-2] When a body is moving it gains … Conservation of mechanical energy. Electrical energy can refer to several closely related things. The law of conservation of momentum tells us that the amount of momentum for a system doesn't change. As shown … The transfer of energy by means of mechanical motion is called work. When is the work done on an object said to be negative. Mechanical Energy. The text has been developed to meet the scope and sequence of most university physics courses and provides a foundation for a career in mathematics, science, or engineering. Two forms of potential energy are gravitational potential energy and elastic potential energy. Common units for selling by energy content are joules or therms. All rights reserved. In this lesson, we will explore physics' right-hand rule and then put it into practice. It is named after James Watt, the inventor of the steam engine. Explore the definition and explanation of mutual inductance and how it happens, how it works in transformers, and its other applications. For example, the heat of combustion of cyclopropane (696 kJ/mol) is higher than that of propane (657 kJ/mol) for each additional CH 2 unit. Thermal energy is measured in It is a mechanical unit of energy defined by the following relationship: 1 hp-hr = 1.980 x 10 6 ft-lbf . b. b) Prove that total mechanical energy is conserved at B and C. Answer: a) Potential energy b) Consider a body of mass ‘m’ at a height h from the ground. Therefore, the SI unit of energy is the joule, and the CGS unit of energy is erg. When a certain amount of force in Newton is applied to an object and it moved a certain … Graphing the Motion of Objects: Physics Lab. A short quiz will follow. The SI units for energy and work JOULES 2. Mechanical Energy B. You'll also learn about the differences between a constellation and an asterism. Where. Units of Energy. Because energy is defined via work, the SI unit for energy is the same as the unit of work – the joule (J), named in honor of James Prescott Joule and his experiments on the mechanical equivalent of heat. The relationship between some derived SI units and the basic SI units is represented in Table 2. Mechanical Engineering This is the product of Force (in Newtons) and Distance (in meters) Energy is usually measured in terms of heat, which is measured in calories or joules The SI unit of energy is the Joule… involves optimizing the use of mechanical energy. Kinetic Energy is the energy an object has owing to its motion. c Q = Flow in m3/s. A unit of electrical energy, particularly for utility bills, is the kilowatt-hour (kWh); one kilowatt-hour is equivalent to 3.6 megajoule. Electrical Energy C. Mechanical Power D. Electrical Power Answer (a):- Answer (b): Answer (c): Answer (d):-. Your Citation. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 meter against a force of 1 Newton. WATTS 3. J Other units of energy also are used, in specific contexts, such as the still smaller unit, the electron volt, on the atomic and subatomic scale. Ask questions, submit answers, leave comments. This is the product of Force (in Newtons) and Total energy at the point A Potential energy at A, PE = mgh kinetic energy K.E = 1/2 mv² = 0 (since the body at rest, v = 0). The Hartree (the atomic unit of energy) is commonly used in calculations. Type of energy associated with the motion of an object. Energy. We will still consider steady-state … In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. Physical waves, or mechanical waves, form through the vibration of a medium, be it a string, the Earth's crust, or particles of gases and fluids.Waves have mathematical properties that can be analyzed to understand the motion of the wave. A short quiz will follow. After watching this video, you should be able to explain what centripetal force is, identify the centripetal force in a particular situation, and solve problems using the centripetal force equation. In spectroscopy the unit cm−1 ≈ 0.0001239842 eV is used to represent energy since energy is inversely proportional to wavelength from the equation Many of the equations and tools used in physics are pretty complex, but not all of them. The Joule. are several instruments which are used to measure energy. A short quiz will follow. How many machine cycles in the XCHG instruction? p = Density of the liquid in kg/m3. Power is the rate at which work is done, or energy is transmitted. It is the energy contained within the system, excluding the kinetic energy of motion of the system as a whole and the potential energy of the system. The movement of electrons from one atom to another is what results in electrical energy. Electrical Units of Measure. The standard units of electrical measurement used for the expression of voltage, current and resistance are the Volt [ V ], Ampere [ A ] and Ohm [ Ω ] respectively. g = acceleration due to gravity. dozlerj_59825. This lesson will examine the causes of species extinction from mass extinctions in the past to human-caused extinctions today. Establish a relationship between SI unit and commercial unit of energy. This text is designed from the ground up to be concise and focused, resulting in a book that is less intimidating and easier to use, with well-coordinated explanations, art, worked examples, and end-of-chapter problems. Mechanical Energy is a property of a system (in fact it is another state variable). These are the conventions used in this book. The joule is the SI unit for energy. Homework Statement A 5.0 kg block hangs from a spring with spring constant 2000N/m. After watching this lesson, you will be able to explain what kinetic energy of rotation is, provide the equation to calculate it, and solve simple kinetic energy of rotation problems. ; The energy provided by electricity; In any of these cases, the SI unit of electrical energy is the joule; which is the amount of energy used by a one-watt load, such as a tiny light bulb, drawing power for one second. The law of conservation of mechanical energy states that total mechanical energy of a =n isolated system is conserved (remains constant). 7th - 10th grade. 3. This is actually a measurement of average power consumption, meaning the average rate at which energy is transferred. Here, you'll get a better understanding of what Newton's third law means, as well as practice both drawing and interpreting free-body diagrams. If we use SI base unit, then the unit of work is Kg.m2s-2. M.E = K. E + P.E. And ther are 2 big forms of mechanical energy, kinetic energy and potential energy. A farmer has 19 sheep All but 7 die How many are left? A short quiz will follow. Reference space & time, mechanics, thermal physics, waves & optics, electricity & magnetism, modern physics, mathematics, greek alphabet, astronomy, music Style sheet. It can mean: The energy stored in an electric field; The potential energy of a charged particle in … Physics. A list of the base and derived units used in this book is given as well. This book will be very useful to students studying for CNAA degrees. The strain energy in the form of elastic deformation is mostly recoverable in the form of mechanical work. Lesson topics will include equations and theories related to momentum. The principle of the conservation of mechanical energy states that the mechanical energy in a system remains constant as long as the only forces acting are conservative. Found inside – Page 439In the SI system of units, the joule is the unit of energy and is defined as 1 1 22 joule N1 m k1g ms ⋅N1 k1g ⁄s The U.S. Customary unit of thermal energy is related to mechanical energy through 1 1 1055 Btu l778778 b ftf Btu J10551055 ... Series Circuit: Calculating Voltage Drops with Ohm's Law. Specifically, we'll look at how these formulas can be applied to moving an object across a surface and lifting weights. When discussing the "universe", one will come across a phrase that somehow refers to “matter and energy”, as though they are opposites, or two side... [1], A gram of TNT releases 4,100 to 4,600 joules (980 to 1,100 calories) upon explosion. What are the a.) In this lesson, you'll have the chance to explore the differences between elastic and inelastic collisions, and use that knowledge to solve problems. Found inside – Page 6Its SI unit is joule (kg m2 s–2). POSITIVE WORK DONE • Positive work means that force is parallel to displacement, i.e. in the direction of displacement. TRANSFORMATION OF ENERGY • In a heat engine, heat energy changes into mechanical ... The law of conservation of mechanical energy states that total mechanical energy of a =n isolated system is conserved (remains constant). After watching this lesson, you will be able to measure the motion of an object and plot position-time and velocity-time graphs based on your data. Also … quantity. E Natural gas is often sold in units of energy content or by volume. H = Piezometric height in meter of water. Key equation: PE (Gravitational Potential Energy) = mgh, where m is an object’s mass, g is the acceleration due to gravity, and h is the vertical height of an object. Series circuits only have one path for current to flow. ; For example, length is a dimension, but it is measured in units of feet (ft) or meters (m). ii). In this lesson, you'll learn about the two types of collisions as well as how momentum is conserved in each. One watt is defined as the energy consumption rate of one … Thermometer, calorimeter, bolometer, etc. Question: 6. The Total Mechanical Energy. frequency b.) In this video lesson you'll identify how to correctly represent forces in a free-body diagram through vector arrows and force labels. Because, for many applications, infinity is the only reasonable place to set it to zero. At first it might seem like setting potential to zero at [... What to reply if some one say michhami dukkadam? The unit of energy, work, and quantity of heat is the joule (J). kinetic energy. This lesson will teach you about ancient constellations and how they came to be. FE-CH2.pdf - THERMODYNAMICS I CHAPTER 2 Energy and Energy per Unit Mass SI:<=>:<=>:< A;BC DEFF Kinetic Energy ① ③ Kinetic Energy per unit mass The British imperial units and U.S. customary units for both energy and work include the foot-pound force (1.3558 J), the British thermal unit (BTU) which has various values in the region of 1055 J, the horsepower-hour (2.6845 MJ), and the gasoline gallon equivalent (about 120 MJ). in calories or joules, The SI unit of energy is the Joule. It is the horsepower-hour (hp-hr). Found inside – Page 201Nm = 1 Joule (J) Power: The rate of workdone per unit time is called power P = dW dt =d (F∙x) dt if force F is constant with time then P = F dx dt = Fv The S.I. unit of power is watt which is equal to 1 N-m/s or 1 J/s. ... but it can change from one form to another. energy and units DRAFT. The SI unit of energy is Joule. Give The Name And Symbol Of The SI Unit For The Following Quantities: A. Found inside – Page 18SI UNITS IN ENGINEERING DESIGN AND DRAFTING 1 1 1 ( [ [ Table 3-1 . ... psi Conversion factors from Customary to SI are a . the unit of mechanical energy or work is the footpound , ft - lb . b . the unit of electrical work or energy is ... Hm = Energy or pressure loss of the hydraulic network expressed in m. Mechanical energy in hydrostatic load (fluid on open circuit) With: P = Power transmitted to the fluid by the pump in Watt. SI is an absolute system of units. In the European Union, food energy labeling in joules is mandatory, often with calories as supplementary information. Derived SI units There are no gravitational units … A basic introduction to the metric system. [clarification needed] Historically Rydberg units have been used. The SI unit of energy is Joules (J) which is also termed as Newton-meter. The SI units are Kilograms for M, 9.8 /s/s or 10 m/s/s for G, and Meters for H. Answer: SI unit of energy is joule and the commercial unit of energy is the joule. This definition causes the SI unit for energy is the same as the unit of work – the joule (J).Joule is a derived unit of energy and it is named in honor of James Prescott Joule and his experiments on the mechanical equivalent of heat. The SI unit of thermal energy is the joule (J). Found inside – Page 195(a) Name two forms of mechanical energy. Define the SI unit of energy. (b) A man of mass 50 kg jumps from a height of 0.5 m. If g = 10 m/s2, what will be his energy at the highest point? (c) Calculate the energy of a body of mass 20 kg ... Understanding the Efficiency of Compound Machines. The modified or developed form of Metric System (one of the system of units for measurement consist of three fundamental units which … The total mechanical energy of the object is. heat will transfer from a warm body with higher temperature to a colder body with lower temperature; Other units used to quantify heat are the British Thermal Unit - Btu (the amount of heat to raise 1 lb of water by 1 o F) and the Calorie (the amount of heat to raise 1 gram of water by 1 o C (or 1 K)). The energy E in the system is proportional to the square of the amplitude. The total strain energy corresponds to the area under the load deflection curve, and has units of in-lbf in US Customary units and N-m in SI units. m = mass of an object. So let's look at some examples I've got my scush ball and if I hold it up high it's got potential energy right? = m Mechanical Energy and the Bernoulli Equation - The mechanical energy equation related to energy per unit mass, energy per unit volume and energy per unit weight involving head; Pitot Tubes - Pitot tubes can be used to measure fluid flow velocity by measuring static and dynamic pressure difference © copyright 2003-2021 Study.com. − The International System unit of electrical, mechanical, and thermal energy. The SI unit for work and energy is the joule, defined as 1 N m. The amount of mechanical work … Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton. Does the law of conservation work when doing an... A spring (spring constant of 2500 N/m) is fixed... After watching this video lesson, you will be able to explain what a heat engine is, how it works from a thermodynamic perspective, and complete some simple calculations involving the efficiency of a heat engine. The SI unit of energy/work is the joule (J), named for English physicist James Prescott Joule (1818 - 1889). Energy is transferred or transformed whenever work is done.. Energy is…. Electricity usage is often given in units of kilowatt-hours per year or other time period. In the most of the world, natural gas is sold in gigajoules. To define the tonne of TNT, this was standardized to 1 kilocalorie (4,184 joules) giving a value of 4.184 gigajoules (1 billion calories) for the tonne of TNT. What is the SI unit for mass. Correct answer - Define two forms of mechanical energy and give their si units - eanswersin.com Distance, Velocity, Momentum, Force, Pressure, Work and Energy Distance, Speed and Acceleration distance: x is measured in units of m, for meters. Energy Definition Physics: The energy of a body is its capacity of doing work. {\displaystyle E=h\nu =hc/\lambda } 10 After watching this video, you will be able to define projectile motion and use the equations of projectile motion to make predictions about motion in a real-life scenario. For thermochemistry a calorie of 4.184 J is used, but other calories have also been defined, such as the International Steam Table calorie of 4.1868 J. Introduction ; There is a difference between dimensions and units. being the proportionality constant. Heat (Energy) The SI-unit of heat - or energy - is joule (J).. With temperature difference . KINETIC 4. We'll also practice calculating unknown forces, mass, and acceleration. The unit of energy in this unit system is joule (J), and the unit of power is watt (W). The text then examines SI units conversion tables and engineering data in SI units. Found inside – Page 6Its SI unit is joule (kg m2 s–2). POSITIVE WORK DONE • Positive work means that force is parallel to displacement, i.e. in the direction of displacement. TRANSFORMATION OF ENERGY • In a heat engine, heat energy changes into mechanical ... 0. Electrical energy can refer to several closely related things. Units of Energy. International System of Units. 1055 Joules. watt-hour. In many regions, food energy is measured in large calories or kilocalories equalling 1000 calories, sometimes written capitalized as Calories. Found inside1Nm = 1 Joule (J) Power: The rate of workdone per unit time is called power dW_d (Fox) Todt To di if force F is constant with time then dx P = F dt = F V The S.I. unit of power is watt which is equal to 1 N-m/s or 1 J/s. When you combine simple machines, you increase the mechanical advantage, but might have to sacrifice some efficiency. The principle … 2. period (T) - is the time for one wave cycle (two pulses, or from crest to crest or trough to trough), in SI units of seconds (though it may be referred to as … The kilowatthour (kWh) is presently allowed as an alternative in electrical applications, but should not be introduced in new applications. Energy is power integrated over time. mechanical energy (kinetic and potential energies); non-conservative forces: motion in a vertical circle; elastic and inelastic collisions in one and two dimensions. Initial Mechanical Energy = Final Mechanical Energy Ki +Ui = Kf +Uf 1 2 mv2 i +0 = 0+ 1 2 kx2 =) x = vi sm k = 1:2 v u u t0:8 50 = 0:152 m. Lecture 10: Potential Energy, Momentum and Collisions 2 Chapter 8: LINEAR MOMENTUM and COLLISIONS The flrst new physical quantity introduced in Chapter 8 is Linear Momentum The joule is the SI unit used for any type of energy, so it... See full … The work done is said to be negative when … Found inside – Page 10Table 1.2 List of prefixes, SI units, and conversion factors [4] (a) Prefixes for powers of 10 Fractional order Multiple order Prefix Symbol Value Prefix Symbol Value Atto a 10À18 Kilo k 103 Femto f 10À15 Mega M 106 Pico p 10À12 Giga G ... Found inside – Page 46In SI Units J. L. Gwyther, W. D. Brown, G. Williams. The units of mechanical energy We have seen that energy is convertible into work, and therefore we must expect the units of mechanical energy and work to be the same. What S.I. unit is used to measure mechanical energy? SI pedagogue here. It is not usual to put it as S.I., but rather SI There are units and symbol... The SI unit for intensity is watts per square meter (W/m … Mechanical energy is the sum of potential energy and kinetic energy in an object that is used to do work. system is Joule (J). The two most commonly used units of powerin the United States customary units are mechanical horsepower and Btu/hour. How the moisture content of the aggregates obtainable at site affect the water content ratio specified? One joule is equal to the energy used to accelerate a body with a mass of one kilogram using one newton of force over … Which of the following is the SI unit for mass? These and many other units can be derived from the basic SI units. Because energy is defined via work, the SI unit for energy is the same as the unit of work – the joule (J), named in honor of James Prescott Joule and his experiments on the mechanical equivalent of heat. One eV is equivalent to 1.60217653×10−19 J. In discussions of energy production and consumption, the units barrel of oil equivalent and ton of oil equivalent are often used. Found inside – Page 181Nm = 1 Joule (J) Power: The rate of workdone per unit time is called power P = dW dt =d (F∙ x) dt if force Fis constant with time then P = F dx dt = Fv The S.I. unit of power is watt which is equal to 1 N-m/s or 1 J/s. 1 KW = 1000W. SI is a rational system of units, as it assigns only one unit to a particular physical. In slightly more fundamental terms, 1 joule is equal to 1 newton metre and, in terms of SI base units Practice Using Free-Body Diagrams to Calculate Balanced Forces. h Cite this Article Format. The Total Mechanical Energy. Found inside – Page 133The joule is the International System of Units (SI) unit of work for energy (mechanical, electrical, solar, and so on) and the newton meter is the SI unit for moment of force or torque. The SI unit for power is the watt (abbreviated W), ... Found inside – Page 14The mechanical power in a typical hydraulic system is presented in the form of input power to drive the hydraulic ... In Eq. (1.13), the torque is measured by N·m, the angular velocity is in s−1, and the unit of power is W in SI units. Energy is defined via work, so the SI unit of energy is the same as the unit of work – the joule (J), named in honour of James Prescott Joule and his experiments on the mechanical equivalent of heat. Conservation of Mechanical Energy. Q = Flow in m3/s. One cubic metre contains about 38 megajoules. This conversation is already closed by Expert Was this answer helpful? The total mechanical energy (defined as the sum of its potential and kinetic energies) of a particle being acted on by only conservative forces is constant.. See also: Conservation of Mechanical Energy An isolated system is one in which no external force causes energy changes. The joule (J) is the SI (International System) unit used to measure mechanical energy. Save. Joule’s findings resulted in his development of the mechanical theory of heat and Joule’s law, which quantitatively describes the rate at which heat energy is … In this lesson, we'll explore how that can be true even when the momenta of the individual components does change.   Found inside – Page 184Joule J The joule is the fundamental SI unit of energy. A joule is a newton-meter (a force of 1 newton acting over a 1-m distance). A joule is a fairly small unit of energy, so the kilo-joule (kJ), equal to 1000 J, is commonly used in ... Found inside – Page 212SI unit of energy is joule ( J ) . Energy is a scalar quantity , Mechanical energy It enables a body to perform some mechanical work . The common forms of mechanical energy are ( i ) Kinetic energy ( ii ) Potential energy The sum total ...

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