work, power and energy worksheet with solutions

Neglecting any problems of generator efficiency and practical considerations such as resting time: (a) How many people would it take to run a 4.00-kW electric clothes dryer? If you do not submit the map sheet your assignment will not be graded and you will receive a zero. When work is done, energy is used. Have students consider the fact that the speed of transportation increased roughly tenfold. Formula: Work = Force distance W= F S W = 35 300 W=10500 J, Your email address will not be published. (b) Compare this force with the weight of the jogger. Changes were made to the original material, including updates to art, structure, and other content updates. 81. Work Power Energy Cheat Sheet :: Physics Tutorials Work Power Energy Cheat Sheet Work A force is applied an object and object moves in the direction of applied force then we said work has done. Work can increase energy, and energy can do work. 1 The last example is less obvious. (a) What is the power output in watts and horsepower of a 70.0-kg sprinter who accelerates from rest to 10.0 m/s in 3.00 s? When a coconut falls from a tree, work W is done on it as it falls to the beach. Suggested reading: Work Notes Work Assignments kinetic energy. Showing top 8 worksheets in the category - Work Power And Energy. Body fat is metabolized, supplying 9.30 kcal/g, when dietary intake is less than needed to fuel metabolism. m (c) Given this power, what is the average force of air resistance if the airplane takes 1200 s? e Is your increase in gravitational potential energy the same in both cases? Worksheets are Physics work work and energy, Topic 5 work and energy, A guide to work energy and power, Physics work and energy work solutions, Physics work and energy work solutions, Energy fundamentals lesson plan work energy, Name period date, Mission 1 what is energy. describe and apply the workenergy theorem; calculate the mechanical energy of, power generated within, impulse applied to, and momentum of a physical system. On the height of the shelf? After exerting a force on the floor through this 0.400 m, his feet leave the floor and his center of gravity rises 0.950 m above its normal standing erect position. (b) How much work is done by the cable in lifting the elevator 20.0 m? 4. 84. However, a commercial unit of electrical energy is kilowatt-hour. You can & download or print using the browser document reader options. A toy gun uses a spring with a force constant of 300 N/m to propel a 10.0-g steel ball. If you do not submit the map figure your assignment will not be graded. Prompt *Click on Open button to open and print to worksheet. (d) What is the guns maximum range on level ground? Work-Energy Theorem Work done by a force in displacing a body is equal to change in its kinetic energy. (a) \(\displaystyle 16.110^3N\) Work done against these forces is always dissipated by being converted into non usable forms of energy like heat, light, sound etc. (a) \(\displaystyle 4.6510^3kcal\) Calculate the work done by a 2.4 N force pushing a 400. g sandwich across a table 0.75 m wide. Want to cite, share, or modify this book? Solution v Units for Response (b) How much work did it do to raise its own center of mass to the branch? Energy, Work & Power Stephen Taylor 33.8k views 45 slides A work, energy and power dukies_2000 1.6k views 39 slides Chapter 6 Work And Energy Analin Empaynado 53k views 33 slides work energy theorem and kinetic energy Kharen Adelan 7k views 23 slides Work Energy And Power shubhendraojha 6k views 50 slides Work energy power arsharamesh 58. What is the relationship of potential energy to conservative force? Force and motion must be in same (c) What is the average force of friction if the hill has a slope \(\displaystyle 2.5\) above the horizontal? Explain. 51. = [AL][AL] Remind students of the equation Elastic Potential Energy is the work done by pulling the spring by an amount x. k = spring constant x = displacement Formula Booklet Formula Booklet There are two major kinds of potential energy: Elastic Potential Energy Gravitational Potential Energy is the work done by the moving force in placing the body at a height h above its initial position. Identify the forms of energy the car has, and how they are changed and transferred in this series of events. Power can be expressed in units of watts (W). (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? A \(\displaystyle 5.0010^5-kg\) subway train is brought to a stop from a speed of 0.500 m/s in 0.400 m by a large spring bumper at the end of its track. Lesson 1 - Basic Terminology and Concepts. Legal. 2 conditions for Maikling Kwento Na May Katanungan Worksheets, Developing A Relapse Prevention Plan Worksheets, Kayarian Ng Pangungusap Payak Tambalan At Hugnayan Worksheets, Preschool Ela Early Literacy Concepts Worksheets, Third Grade Foreign Language Concepts & Worksheets. ( About 28 kW (or about 37 hp) is reasonable for a car to climb a gentle incline. (Thu) Clicker Questions: Energy uploaded to Teams after class. (For simplicitys sake, we will leave aside for now the fact that the man climbing the stairs has also done work on himself.). t (a) How long can you play tennis on the 800 kJ (about 200 kcal) of energy in a candy bar? Picture given below shows this motion. 55. Solution Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. What is the cost of operating this air conditioner 3.00 h per day for 30.0 d if the cost of electricity is $0.110 per \(\displaystyle kWh\)? Describe the energy transfers and transformations for a javelin, starting from the point at which an athlete picks up the javelin and ending when the javelin is stuck into the ground after being thrown. Some of the worksheets displayed are Physics work work and energy, Topic 5 work and energy, A guide to work energy and power, Physics work and energy work solutions, Physics work and energy work solutions, Energy fundamentals lesson plan work energy, Name period date, Mission 1 what is energy. (a) Using energy considerations, calculate his velocity when he leaves the floor. Be careful, direction of applied net force and direction of motion must be same. Compare the kinetic energy of a 20,000-kg truck moving at 110 km/h with that of an 80.0-kg astronaut in orbit moving at 27,500 km/h. Consider humans generating electricity by pedaling a device similar to a stationary bicycle. Solution 43. fd Shivering is an involuntary response to lowered body temperature. =fmg (These electrons were not dangerous in themselves, but they did create dangerous x rays. Find her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800. All rights reserved.Use this space to build your submission.You can add text, images, and files.Add ContentDetails & Information. By the end of this section, you will be able to do the following: The learning objectives in this section will help your students master the following standards: In addition, the High School Physics Laboratory Manual addresses the following standards: Use the lab titled Work and Energy as a supplement to address content in this section. by working in a You have most likely heard the term used in relation to electrical devices, especially light bulbs. Read the questions carefully and make sure you annotate the map where instructed. Access over 20 million homework documents through the notebank, Get on-demand Q&A homework help from verified tutors, Read 1000s of rich book guides covering popular titles. (c) The energy of a body is its capacity to do work. (b) 69 flights of stairs. Some of the worksheets displayed 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. (See Figure.) (d) 38.6 N [AL] Explain relationships between the units for force, work, and power. Work done on a system puts energy into it. (d) It would be impossible to maintain this power output for 2 hours (imagine sprinting for 2 hours!). formula for (Nehemiah Hawkins, Wikimedia Commons), https://www.texasgateway.org/book/tea-physics, https://openstax.org/books/physics/pages/1-introduction, https://openstax.org/books/physics/pages/9-1-work-power-and-the-work-energy-theorem, Creative Commons Attribution 4.0 International License, Describe and apply the workenergy theorem. then you must include on every digital page view the following attribution: Use the information below to generate a citation. A 75.0-kg cross-country skier is climbing a \(\displaystyle 3.0\) slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of \(\displaystyle 20.0\) with the horizontal. 74. (a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? v [OL][AL] Work is measured in joules and (c) \(\displaystyle 1.410^4 kg\) (14 metric tons). 1 User generated content is uploaded by users for the purposes of learning and should be used following Studypool's. Solution: Given data: time=t= 4s Work =W = 20J Power =P=? 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. (a) How much gravitational potential energy (relative to the ground on which it is built) is stored in the Great Pyramid of Cheops, given that its mass is about \(\displaystyle 7 10^9 kg\) and its center of mass is 36.5 m above the surrounding ground? (a) How much work is done by friction as the sled moves 30.0 m along the hill? So make sure that you develop a good comfort level with this chapter and feel free to ping us, if you have any doubts Give some examples of each. 34. 35. (a) What is the average useful power output of a person who does \(\displaystyle 6.0010^6J\) of useful work in 8.00 h? What do you understand by transformation of energy? (b) 2.52% (b) What is the average power consumption rate in watts if she does this in 3.00 min? 6. \(\displaystyle 3.00 J=7.1710^{4} kcal\). Work Power & Energy Some things that we typically consider to be work are not work in the scientific sense of the term. An object does free fall. Consider a person climbing and descending stairs. 3. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo Worksheets are Physics work work and energy, A guide to. Very large forces are produced in joints when a person jumps from some height to the ground. What is the difference between energy conservation and the law of conservation of energy? Definition and Mathematics of Work. FME 18 What is the work done in this case? In a downhill ski race, surprisingly, little advantage is gained by getting a running start. Under what conditions would it lose energy? 12. The joule is named after physicist James Joule (18181889). The manufacturers of an exercise bicycle claim that you can lose 0.500 kg of fat per day by vigorously exercising for 2.00 h per day on their machine. (b) Considering the amount of power generated, do you think a well-trained athlete could do this repetitively for long periods of time? 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 Crab Nebula (credit: ESO, via Wikimedia Commons). It moves cars along the road and boats over the water. Solution Construct a problem in which you calculate the long-term rate at which stairs can be climbed considering the mass of the person, his ability to generate power with his legs, and the height of a single stair step. (a) Work is said to be done by a forte only when the body moves. Analyzing the units of the term (1/2)mv2 will produce the same units for joules. Identifyand describethree dimensions of climate which cause the Nabesna Glacier to extend over a much larger distance than the Athabasca Glacier. 8. 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 P= (a) \(\displaystyle 0.500 m/s^2\) Life Process 17. Although the force F is an invariant, independent in both magnitude and direction of our choice of inertial frames, the displacement S is not. Machines 4. Later model tube TVs had shielding that absorbed x rays before they escaped and exposed viewers. (a) How long would it take a \(\displaystyle 1.5010^5\)-kg airplane with engines that produce 100 MW of power to reach a speed of 250 m/s and an altitude of 12.0 km if air resistance were negligible? The Crab Nebula (see Figure) pulsar is the remnant of a supernova that occurred in A.D. 1054. This book uses the Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a \(\displaystyle 60.0\) slope at constant speed, as shown in Figure. Construct a problem in which you determine the number of people it would take to replace a large electrical generation facility. Does the name Joule sound familiar? A worker carrying bricks, a farmer sowing seeds, a student preparing for the exams, etc., are said to do their work. 1999-2023, Rice University. 11. Our verified tutors can answer all questions, from basicmathto advanced rocket science! (c) Does the answer surprise you? Payment is made only after you have completed your 1-on-1 session and are satisfied with your session. 25. Solution. 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. then you must include on every physical page the following attribution: If you are redistributing all or part of this book in a digital format, Force, F = 25 N. Displacement, dr = 15 m. Angle between F and dr, = 30o. What is special about these areas of glacial formation?4.The glaciers we examined in the Canadian Rockies all end at 6700-7500elevation. 1.0 J = 1.0 Nm, the units of force multiplied by distance. Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in altitude. 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. I expect you to assure a high grade on this assignment. Kinetic energy depends on the mass of an object and its velocity, v. When we drop the rock the force of gravity causes the rock to fall, giving the rock kinetic energy. (a) What is the average power consumption in watts of an appliance that uses \(\displaystyle 5.00 kWh\) of energy per day? Identify unknowns: power \(\displaystyle P\) of the car, force \(\displaystyle F\) that car applies to road Define Energy Solve for unknown: (c) What is the final speed of the elevator if it starts from rest? What does your answer imply about how much of their work went into block-lifting, versus how much work went into friction and lifting and lowering their own bodies? If we apply force to lift a rock off the ground, we increase the rocks potential energy, PE. What is the efficiency of the body when shivering, and is this a desirable value? Energy of motion due to velocity and mass Formula: Work (Energy) / time Define kinetic energy KE= * m * v2 Stored energy due to position, condition and chemical composition Define potential energy GPE = m * gravity (9.8) * h Define Energy due to position and motion ( Me= Ke + Pe) mechanical energy Identify the types of potential energy 73. Download PDF. 19. Among the things to consider are the power output that is reasonable using the legs, rest time, and the need for electricity 24 hours per day. x. . Jogging on hard surfaces with insufficiently padded shoes produces large forces in the feet and legs. Why do glaciers not extend below this altitude? End the section by clearing up any misconceptions about the distinctions between force, work, and power. Some of the worksheets displayed are Physics work work and energy, Physics work and energy work solutions, Physics work and energy work solutions, Physics in concert teacher notes and student work, Physics work momentum impulse work and energy, Skill and practice work, Physics work momentum impulse work and energy . Internet science 10 work and vitality worksheet reply key. How much work is done by the boy pulling his sister 30.0 m in a wagon as shown in Figure? Paul Peter Urone(Professor Emeritus at California State University, Sacramento) and Roger Hinrichs (State University of New York, College at Oswego) withContributing Authors: Kim Dirks (University of Auckland) andManjula Sharma (University of Sydney). (a) What is the work done on the cart by friction? (a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months? where \(\displaystyle F\) is parallel to the incline and must oppose the resistive forces and the force of gravity: Calculate the work done by a 47 N force pushing a pencil 0 m. Calculate the work done by a 47 N force pushing a 0 kg pencil 0 m against a force of 23 N. Calculate the work done by a 2 N force pushing a 400. g sandwich across a table 0 m wide. Lets examine how doing work on an object changes the objects energy. [BL][OL] Review the concept that work changes the energy of an object or system. 79. We describe this in terms of power. 2 Solution Suppose the woman in Figure 9.3 lifting the TV with a pulley gets the TV to the fourth floor in two minutes, and the man carrying the TV up the stairs takes five minutes to arrive at the same place. Assuming friction is negligible, describe changes in the potential energy of a diving board as a swimmer dives from it, starting just before the swimmer steps on the board until just after his feet leave it. Provide details on what you need help with along with a budget and time limit. A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m-high rise as shown in Figure. In the diagram below, the spring has a force constant of 5000 N/m, the block has a mass of 6.20 kg, and the height h of the hill is 5.25 m. Determine the compression of the spring such that the block just makes it to the top of the hill. 82. (a) What is his work output in each stroke? In science, work has a precise meaning. Some of the worksheets displayed are Physics work work and energy, Topic 5 work and energy, A guide to work energy and power, Physics work and energy work solutions, Physics work and energy work solutions, Energy fundamentals lesson plan work energy, Name period date, Mission 1 what is energy. The person in Figure does work on the lawn mower. Topics and Sub Topics in Class 9 Science Chapter 11 Work Power and Energy: These solutions are part of NCERT Solutions for Class 9 Science. How much work does a supermarket checkout attendant do on a can of soup he pushes 0.600 m horizontally with a force of 5.00 N? An ice skater with a mass of 50 kg is gliding across the ice at a speed of 8 m/s when her friend comes up from behind and gives her a push, causing her speed to increase to 12 m/s. 1 Work done = Force Displacement W = F S Where, F = 7 N S = 8 m So, work done, W = 7 8 W = 56 Nm W = 56 J Exercise-11.2 Page: 149 1. With the same assumptions, what area would be needed to meet the United States energy needs \(\displaystyle (1.0510^{20}J)\)? Sound 9. (d) The S.I. (a) 9.5 min If Work, Power and Energy Worksheet. 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. The ball has energy. W=fd Explain your answer. 5. A weightlifter lifts a 200 N barbell from the floor to a height of 2 m. How much work is done? Answer the following questions on a separate sheet of paper. 50. 78. (credit: NASA photo by Beasley). 2 Are you in need of an additional source of income? A 75.0-kg person climbs stairs, gaining 2.50 meters in height. The awe-inspiring Great Pyramid of Cheops was built more than 4500 years ago. direction This is the principle of conservation of energy. 2 We recommend using a Energy can be converted from one form to another. Study Guide Using a force to move something a distance (credit: Leszek Leszczynski, Flickr), Solution Calculate the area in \(\displaystyle km^2\) of solar energy collectors needed to replace an electric power plant that generates 750 MW if the collectors convert an average of 2.00% of the maximum power into electricity.
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