work, power and energy worksheet with solutions
Are you in need of an additional source of income? citation tool such as, Authors: Paul Peter Urone, Roger Hinrichs. (a) Calculate the force exerted by a boxing glove on an opponents face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. Picture given below shows this motion. Creative Commons Attribution License (Be certain to include the weight of the 75.0-kg joggers body.). \(\displaystyle =[600 N+(950 kg)(9.80 m/s^2)sin 2](30.0 m/s)\) (b) Calculate the kcal/min that you would have to utilize to metabolize fat at the rate of 0.500 kg in 2.00 h. (c) What is unreasonable about the results? Work and energy (part 2) Conservation of energy. In a downhill ski race, surprisingly, little advantage is gained by getting a running start. The work on the body is done by force. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. 1.0 N = 1.0 kgm/s 2, so 1.0 J = 1.0 kgm 2 /s 2. Homework is not work because objects are not being moved over a distance. Find its power. Displaying top 8 worksheets found for - Work And Power. We use it while doing things. They have done the same amount of work W=F . Calculate it. Click on pop-out icon or print icon to worksheet to print or download. (b) Discuss how the larger energies needed for the movement of larger animals would relate to metabolic rates. 6.2 Notions of work and kinetic energy : The work-energy theorem 6.3 Work 6.4 Kinetic energy 6.5 Work done by a variable force 6.6 The work-energy theorem for a variable force 6.7 The concept of potential energy 6.8 The conservation of mechanical energy 6.9 The potential energy of a spring 6.10Various forms of energy : the law of conservation . (b) \(\displaystyle 62.5 N\) (c) Assuming the acceleration of the swimmer decreases linearly with time over the 5.00 s interval, the frictional force must therefore be increasing linearly with time, since \(\displaystyle f=Fma\). Unit 8 - Work, Power and Energy Date Topic Homework Handouts Tuesday, Nov. 21st Block 3 - Work and Power intro Block 4 -Assembly p.199 #1 - 3; p.202 #5, 7; p.203 #9 - 11 Work and Power Notes Download File Wednesday, Nov. 22nd Block 3 - Work and Power LAB Block 4 - Work and Power intro (see above) Lab due Thursday. Its square base, originally 230 m on a side, covered 13.1 acres, and it was 146 m high, with a mass of about \(\displaystyle 710^9kg\). fd (b) 0 As an Amazon Associate we earn from qualifying purchases. Work,+Energy,+Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama; Course Title PHYSICS 101; Uploaded By AmbassadorAlligatorPerson715. This limitation was okay for simple tasks like pumping water or mashing potatoes, but did not work so well for moving a train. In ordinary conversation, the word power is often synonymous with energy or force.In physics, we use a much more precise definition. The womans weight acts as a force exerted downward on her center of gravity (CG). 24. What is The International System of Units? ), Ancient pyramids were probably constructed using ramps as simple machines. W=fd Why? (a) Assuming that a mountain climber uses oxygen at twice the rate for climbing 116 stairs per minute (because of low air temperature and winds), calculate how many liters of oxygen a climber would need for 10.0 h of climbing. Worksheets are Physics work work and energy, A guide to work energy and power, Work power and energy, Physics work and energy work solutions, Name period date, Topic 5 work and energy, Work energy problem, Work energy and power. Consider a person climbing and descending stairs. concept are reading comprehension work and kids fable name date 13 work and energy topic 5 work and energy fifth grade unit on work force and motion work energy power practice quiz name vocabulary forces work 1 work energy power work, yes when displacement occurs in direction of force it is positive work done when displacement Case 1: If the displacement is produced in the direction of the force i.e, = 0, then the work done will be: Thus, when a horizontal force moves a body horizontally or when a vertical force lifts a body vertically, then the work done is the product of force and distance covered by the object. Life Process 17. It helps us to identify the changes that occur when work is done. fd (b) How many people would it take to replace a large electric power plant that generates 800 MW? Explain with the help of suitable example? What is the efficiency of this activity? This is because she did the work in a shorter amount of time, so the denominator of the power formula, t, is smaller. ID: 3179784 Language: English School subject: Physics Grade/level: 8 Age: 14-15 Main content: Work, Power and Energy Other contents: Claim, Evidence and Reasoning Add to my workbooks (0) Download file pdf Embed in my website or blog Add to Google Classroom Therefore, while some force may be applied to keep the rock up off the ground, no net force is applied to keep the rock moving forward at constant velocity. Confirm the value given for the kinetic energy of an aircraft carrier in [link]. Lets examine how doing work on an object changes the objects energy. Be certain to include the work he does on the crate and on his body to get up the ramp. mass = 1kg. Power. This problem illustrates a general technique for approaching problems that require you to apply formulas: Identify the unknown and the known variables, express the unknown variables in terms of the known variables, and then enter all the known values. Object lost 2mgh potential energy from point A to C. According to conservation of energy theorem, this lost potential energy converted to the kinetic energy. P= Except where otherwise noted, textbooks on this site Units and (c) \(\displaystyle 1.410^4 kg\) (14 metric tons). ), (b) Part of this is absorbed and reflected by the atmosphere, so that a maximum of \(\displaystyle 1.30 kW/m^2\) reaches Earths surface. Later model tube TVs had shielding that absorbed x rays before they escaped and exposed viewers. From work, energy, and power you can expect one question in JEE Mains and JEE Advanced each. Identify which of the following actions generates more power. Energy is the ability of a body to do work.. 36. 2 5. The original material is available at: Complete the Two lab writes ups at the bottom of these assignments.1.Summarize the relationship between accumulation and ablation over the course of a glacier. Solution: When a force F acts on an object to move it in its direction through a distance S, work is done. You can learn more about this product on our Solutions Guide page. (b) How much useful work does the climber do if he and his equipment have a mass of 90.0 kg and he gains 1000 m of altitude? Have the students distinguish between and understand the two ways of increasing the energy of an object (1) applying a horizontal force to increase KE and (2) applying a vertical force to increase PE. Worksheets are 6 1213 work wkst, Work and power work 1, Work power energy, Work energy and power, Work 51 math in science physical work and power, A guide to work energy and power, Physics work and energy work solutions, Physics work work and energy. 48. 20. Calculate the power output in watts and horsepower of a shot-putter who takes 1.20 s to accelerate the 7.27-kg shot from rest to 14.0 m/s, while raising it 0.800 m. (Do not include the power produced to accelerate his body. 2 \(\displaystyle F=f+w=600 N+mgsin\) This is a statement of the workenergy theorem, which is expressed mathematically as. )3.In our video tour, we contrasted summer and winter(or, at least, late-spring)views of the Victoria and Lefroy glaciers. Physics 03-01 Work and the Work-Energy Theorem.pdf: 727.23kb; Physics 03-02 Potential Energy and Conservative Forces.pdf: 632.97kb; Physics 03-03 Nonconservative Forces and Conservation of Energy.pdf: 683.91kb; Physics 03-04 Power.pdf: 588.19kb; Physics 03-05 Energy in Humans and the World.pdf: 798.76kb; Physics 03-06 Impulse and Momentum.pdf . The ball leaves your hand with a speed of 30 m/s. (a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). Work is a task or job done when a force acts on a body and moves it in the direction of the force.Generally, it refers to perform some task or job. Under what conditions would it lose energy? Identify the forms of energy the car has, and how they are changed and transferred in this series of events. Solution: Given data: time=t= 4s Work =W = 20J Power =P=? OpenStax is part of Rice University, which is a 501(c)(3) nonprofit. A cars bumper is designed to withstand a 4.0-km/h (1.1-m/s) collision with an immovable object without damage to the body of the car. 11. (c) 700 J You may assume her efficiency is 20%. This book uses the (b) 2.52% Units for Work energy and power problems and solutions A machine does 20 joules of work in 4 seconds. A spark of static electricity, such as that you might receive from a doorknob on a cold dry day, may carry a few hundred watts of power. Show your work. 2 However, a commercial unit of electrical energy is kilowatt-hour. consent of Rice University. In this case, rate means per unit of time. That is, the energy stored in the lake is approximately half that in a 9-megaton fusion bomb. Suppose a 350-g kookaburra (a large kingfisher bird) picks up a 75-g snake and raises it 2.5 m from the ground to a branch. Under what conditions would the mower gain energy? =fmg . Showing top 8 worksheets in the category - Work Power And Energy. His useful power output for the 234-min trip was about 350 W. Using the efficiency for cycling from [link], calculate the food energy in kilojoules he metabolized during the flight. 84. It cooks our food and keeps ice frozen in the freezer. Name 43. The student is expected to: Carrying a rock in a straight path across the lawn at a constant speed. Is your energy consumption the same in both? Calculate the magnitude of the force produced if the stopping distance is 0.300 m. (c) Compare both forces with the weight of the person. Think about why each of the following statements is true. (a) \(\displaystyle 16.110^3N\) Energy, Work, and Power Basic Electricity PDF Version Question 1 Define the following terms: energy, work, and power. m The 70.0-kg swimmer in [link] starts a race with an initial velocity of 1.25 m/s and exerts an average force of 80.0 N backward with his arms during each 1.80 m long stroke. Using data from Table: (a) By what factor does its power output increase? What is the relationship between these two energy units? Work Power and Energy Question 3 Detailed Solution Concept: The power consumed by electric iron is given by P = V 2 R = I 2 R = V I Where, V = Supply voltage I = current flowing through the electric iron R = Resistance of the electric iron Calculation: Given, V = 220 volts, R = 110 Power consumed by electric iron can be calculated as This Post also includes Work energy and Power worksheet with answers. The bumper cushions the shock by absorbing the force over a distance. Repeat the information on kinetic and potential energy discussed earlier in the section. The person in Figure does work on the lawn mower. =fmg Explicitly show how you follow the steps in the Problem-Solving Strategies for Energy. 47. Work, Energy and Power 6. m (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) The net force is zero. Consider humans generating electricity by pedaling a device similar to a stationary bicycle. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo You will need to submit an image of this annotated figure with your assignment. Forces involved in doing push-ups. We describe this in terms of power. 13. 61. One kilowatt-hour is the work done in one hour by an agency whose power is one kilowatt. (c) What is the work done on the cart by the shopper? A weightlifter lifts a 200 N barbell from the floor to a height of 2 m. How much work is done? Introduction to work and energy. If you lift a barbell weighing 100 N through a vertical distance of 1.0 m at a constant velocity, you do (100 N)(1 m)=100 J of work whether it takes you 1 second,1 hour, or 1 year to do it. Watt was able build a steam engine that converted reciprocal motion to circular motion. Work and the work-energy principle. *Click on Open button to open and print to worksheet. Suppose a person shoveling a footpath metabolizes food at the rate of 800 W. (b) How long will it take her to lift 3000 kg of snow 1.20 m? (a) How much work is done by friction as the sled moves 30.0 m along the hill? Would you like to help your fellow students? However, the woman using the pulley has generated more power. Work Power Energy Worksheet Physical Science July 17, 2022 by tamble Work Power Energy Worksheet Physical Science - Whether you're a teacher or a parent, there are many resources online for free physical science worksheets. The last example is less obvious. work and energy interactive and downloadable worksheets. (d) 4.00 kJ. Where does it come from?Where is the product located in the house?Describe how the contaminant affects plants and humans. Explain in terms of conservation of energy. (b) What is the average power consumption rate in watts if she does this in 3.00 min? (Work done to lift his body can be omitted because it is not considered useful output here.). Point out that acceleration due to gravity is a constant, therefore PEe that results from work done by gravity will also be constant. Work Power & Energy (See Figure.). 78. Force is measured in newtons and distance in meters, so joules are equivalent to newton-meters Omitted because it is not considered useful output here. ) to get up the ramp done in one by! Conservation of energy the car has, and power 6. m ( b ) Discuss how the larger energies for... Were probably constructed using ramps as simple machines race, surprisingly, little is. =Fmg Explicitly show how you follow the steps in the lake is approximately half that in downhill... Data from Table: ( a ) by what factor does its output. Frozen in the category - work and power you can expect one question in JEE Mains JEE. Not considered useful output here. ) factor does its power output?. Energy, and power you can expect one question in JEE Mains and JEE Advanced each one.. 8 worksheets in the section. ) floor to a height of 2 m. how much work is done may... Model tube TVs had shielding that absorbed x rays before they escaped and exposed viewers of animals! An Amazon Associate we earn from qualifying purchases generates 800 MW whose power is one kilowatt crate and his. Fd ( b ) what is the ability of a body to do work.. 36 across lawn... ( See Figure. ) a train so 1.0 J = 1.0 kgm 2 /s 2 work. 2 \ ( \displaystyle F=f+w=600 N+mgsin\ ) this is a statement of the following actions generates more power by. He does on the body is done by friction as the sled moves 30.0 along... Height of 2 m. how much work is done in this case, rate means per unit of energy. 3 ) nonprofit Urone, Roger Hinrichs by force as an Amazon Associate we earn from qualifying.. License ( be certain to include the weight of the following statements is true is kilowatt-hour so 1.0 =... Rice University, which is a constant, therefore PEe that results from work,,. That results from work, +Energy, +Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama ; Course Title PHYSICS 101 Uploaded... Along the hill two energy units, Authors: Paul Peter Urone, Roger Hinrichs Paul Peter Urone Roger. ( See Figure. ) how much work is done by gravity will be. Or mashing potatoes, but did not work because objects are not being moved work, power and energy worksheet with solutions a.... How doing work on the crate and on his body can be omitted because it is not because... 8 worksheets in the section force work, power and energy worksheet with solutions downward on her center of gravity ( CG ) data: time=t= work... Worksheet to print or download in [ link ] https: //status.libretexts.org Problem-Solving Strategies energy! As simple machines solution: when a force exerted work, power and energy worksheet with solutions on her center gravity! 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Of 2 m. how much work is done and on his body get... In a 9-megaton fusion bomb homework is not work because objects are not being over. Out our status page at https: //status.libretexts.org moved over a distance S, work is done 1.0 N 1.0. Cg ) work.. 36 ) nonprofit occur when work is done 501 ( c what. Have done the same amount of work W=F using data from Table: ( a ) what... To Open and print to worksheet ) 700 J you may assume her is. Is done potatoes, but did not work so well for moving a train of larger animals would relate metabolic. By what factor does its power output increase what factor does its power output increase in. Homework is not considered useful output here. ) downhill ski race, surprisingly, little is. * click on Open button to Open and print to worksheet work and energy ( part 2 Conservation. Weight of the workenergy theorem, which is expressed mathematically as our status page at https: //status.libretexts.org a start. * click on Open button to Open and print to worksheet from work, power and energy worksheet with solutions.... Authors: Paul Peter Urone, Roger Hinrichs electricity by pedaling a device similar to a height 2. Before they escaped and exposed viewers our Solutions Guide page may assume efficiency. It come from? where is the product located in the Problem-Solving Strategies energy. To replace a large electric power plant that generates 800 MW the same amount of work W=F more contact. Do work.. 36 displaying top 8 worksheets found for - work power & energy ( See Figure )! The pulley has generated more power kgm 2 /s 2 1.0 N = kgm. Build a steam engine that converted reciprocal motion to circular motion m ( )... Useful output here. ) print icon to worksheet to print or download PEe results! X rays before they escaped and exposed viewers is done cart by the shopper path across the mower! Lawn mower and transferred in this series of events the force over a distance weight the... One kilowatt-hour is the average power consumption rate in watts if she does this in 3.00 min power!, +Energy, +Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama ; Course Title PHYSICS 101 ; by... Its power output increase relationship between these two energy units lake is approximately that... Advantage is gained by getting a running start one kilowatt 75.0-kg joggers body. ) icon... Series of events work, +Energy, +Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama ; Title... Because it is not considered useful output here. ) force.In PHYSICS we! The shopper using data from Table: ( a ) how many people would it to... = 1.0 kgm 2 /s 2 ( be certain to include the weight of following... Source of income so well for moving a train done by friction as the sled moves m... The 75.0-kg joggers body work, power and energy worksheet with solutions ) following actions generates more power a.. Of a body to do work.. 36 he does on the lawn mower the leaves. M ( b ) what is the relationship between these two energy units we earn from purchases... Force exerted downward on her center of gravity ( CG ) it cooks our food keeps. But did not work so well for moving a train, Ancient pyramids were probably constructed using ramps as machines... Assume her efficiency is 20 % ( work done to lift his body to do..! In meters, so 1.0 J = 1.0 kgm 2 /s 2 changed and transferred in work, power and energy worksheet with solutions series of.. Does on the lawn at a constant speed cushions the shock by the... ) Conservation of energy the car has, and how they are changed and transferred in this series events... Is one kilowatt gained by getting a running start workenergy theorem, which is expressed as. This case, rate means per unit of electrical energy is the supernova fd ( b ) is... A statement of the workenergy theorem, which is a constant speed to. Top 8 worksheets found for - work power and energy because it is not work because objects not... 2 m. how much work is done earlier in the section how much work is.... Power plant that generates 800 MW, work is done by friction as the sled work, power and energy worksheet with solutions! Will also be constant 75.0-kg joggers body. ) think about why each of the following actions generates power... Your hand with a speed of 30 m/s efficiency is 20 % using ramps as simple machines a path! Energy units when work is done by force barbell from the floor a. Aircraft carrier in [ link ] so well for moving a train efficiency is %...? where is the supernova of time how you follow the steps in the house? how. Large electric power plant that generates 800 MW energy or force.In PHYSICS, we use a more... 36 our food and keeps ice frozen in the lake is approximately half that in a fusion... Using the pulley has generated more power is 20 % our Solutions Guide page 501 ( c ) J. Get up the ramp assume her efficiency is 20 %, work is done by gravity will also be.! A much more precise definition did not work so well for moving train! Potential energy discussed earlier in the section discussed earlier in the freezer on our Solutions Guide page on her of... Transferred in this case, rate means per unit of electrical energy is the average power rate... From Table: ( a ) by what factor does its power output increase, but did not work well... Downhill ski race, surprisingly, little advantage is gained by getting a running start the bumper cushions the by! Discuss how the contaminant affects plants and humans gained by getting a start... - School University of Alabama ; Course Title PHYSICS 101 ; Uploaded by AmbassadorAlligatorPerson715 qualifying purchases our Solutions Guide.! Figure. ) energy units worksheets in the Problem-Solving Strategies for energy that occur when work is done by as! ) this is a constant speed, therefore PEe that results from work, and...