Work, Power, and Energy Worksheet 1. The force we exert to lift the rock is equal to its weight, w, which is equal to its mass, m, multiplied by acceleration due to gravity, g. The work we do on the rock equals the force we exert multiplied by the distance, d, that we lift the rock. and you must attribute Texas Education Agency (TEA). Work Power & Energy Using data from Table: (a) By what factor does its power output increase? 2 then you must include on every digital page view the following attribution: Use the information below to generate a citation. The car follows the curved track in Figure. =fmg . (b) 2.52% Displaying all worksheets related to - Work And Power. (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). The subscripts 2 and 1 indicate the final and initial velocity, respectively. 35. !Perfect for expanding on concepts of energy, heat, work, and power.Can be used as a standalone lesson or as a sub plan.Includes a fun story about Max and his adventure to make learning about kinetic and potential energy engaging.Two versions of informational . Distinguish between initial and final velocity and pay attention to the minus sign. Formula: Work= Force x Distance Explain why you are not injured by such a spark. Displaying top 8 worksheets found for - Work And Power. fd Using energy considerations, calculate the average force a 60.0-kg sprinter exerts backward on the track to accelerate from 2.00 to 8.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him. 1. e 24. P= 38. (a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1 hp = 746 W) to reach a speed of 15.0 m/s, neglecting friction? ) Analyzing the units of the term (1/2) mv2 will produce the same units for joules. (a) What is the average useful power output of a person who does \(\displaystyle 6.0010^6J\) of useful work in 8.00 h? So, If you want to get benefits from this post, then youll love this post. Identifyand describethree dimensions of climate which cause the Nabesna Glacier to extend over a much larger distance than the Athabasca Glacier. Work Power And Energy Worksheets - total of 8 printable worksheets available for this concept. If college students are struggling with a specific objective, the Check Your Understanding will assist identify which one and direct college students to the related content material. Chinas energy needs \(\displaystyle (6.310^{19}J)\)? In energy conversations and transfers, the total amount does not change. 29. Define Work 52. 42. If there are a number of forces acting on the body, then work done is separately calculated for each force. Displaying all worksheets related to - Work Power And Energy. (credit: John Haslam, Flickr). 34. A box is pulled with a force of 25 N to produce a displacement of 15 m. If the angle between the force and displacement is 30o, find the work done by the force. v The watt unit was named after James Watt (17361819) (see Figure 9.4). Work and Power. 40. (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? 47. Calculate the efficiency of the workers who did the lifting, assuming there were 1000 of them and they consumed food energy at the rate of 300 kcal/h. (a) \(\displaystyle 1.9610^{16}J\) In this post, Youll learn how work power and energy are related with each other. 8. Mountain climbers carry bottled oxygen when at very high altitudes. If students are struggling with a specific objective, the Check Your Understanding will help identify which one and direct students to the relevant content. Do devices with efficiencies of less than one violate the law of conservation of energy? This is a Worksheet Package for the Work and Energy unit of Grade 11 Physics. Fill in the blanks. Introduction to work and energy. Solution In this case, we define the work done by the force on the particle as the product of the component of the force along the line of motion and the magnitude of the displacement S. Sometimes force and displacement do not have the same direction. Some forms of energy are more useful than others. 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. What is the efficiency of this activity? Questions are posted anonymously and can be made 100% private. What happens to mechanical energy if only conservative forces act? 1999-2023, Rice University. The quantity that is the measure of the capacity of a body or a system for doing work. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense. However, the woman using the pulley has generated more power. Solution: Given data: time=t= 4s Work =W = 20J Power =P=? Work as the transfer of energy. Examples could be ingestion, inhalation, skin (dermal) exposure, etc.Once inside the body, how is the contaminant transported and distributed? Compare this to acceleration due to other forces, such as applying muscles to lift a rock, which may not be constant. fd (e) 0. What is the toaster's maximum power rating? Electricity is sold in kilowatt-hours because that equals the amount of electrical energy consumed. What do you understand by transformation of energy? . Give an example of something we think of as work in everyday circumstances that is not work in the scientific sense. An object does free fall. Note that the total mass of the counterbalanced system is 10,000 kgso that only 2500 kg is raised in height, but the full 10,000 kg is accelerated. A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower if this takes 7.30 s? 55. Physics 1120: Work & Energy Solutions Energy 1. 59. t 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? 69. (b) \(\displaystyle 5.8810^5J\) In applications that involve work, we are often interested in how fast the work is done. He exerts a force of 500 N on the crate parallel to the ramp and moves at a constant speed. Kanellos Kanellopoulos flew 119 km from Crete to Santorini, Greece, on April 23, 1988, in the Daedalus 88, an aircraft powered by a bicycle-type drive mechanism (see Figure). 17. Equating \(\displaystyle PE_g\) and \(\displaystyle KE\), we obtain \(\displaystyle v=\sqrt{2gh+v_0^2}=\sqrt{2(9.80 m/s^2)(20.0 m)+(15.0 m/s)^2}=24.8 m/s\). 31. Mechanical Energy. Have students consider the fact that the speed of transportation increased roughly tenfold. We use it while doing things. [BL][OL] Review understanding of mass, velocity, and acceleration due to gravity. *Click on Open button to open and print to worksheet. Use the equations for mechanical energy and work to show what is work and what is not. When a body does work, W, its energy decreases by an amount equal to W.The energy of a body upon which it does work increases by exactly the same amount so that the total energy of the system does not change. With the same assumptions, what area would be needed to meet the United States energy needs \(\displaystyle (1.0510^{20}J)\)? *Click on Open button to open and print to worksheet. This is a Worksheet Package for the Work and Energy unit of Grade 11 Physics. 68. 65. (c) What is the average force of friction if the hill has a slope \(\displaystyle 2.5\) above the horizontal? 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. Since work is a scalar quantity, therefore, power is also a scalar quantity.SI unit of power is the watt (W). Energy brings about changes in the world. Energy can take a variety of different forms, and one form of energy can transform to another. (Hint: See Table.). Show your work. citation tool such as, Authors: Paul Peter Urone, Roger Hinrichs. Studypool is not sponsored or endorsed by any college or university. 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. (a) Calculate the energy in kJ used by a 55.0-kg woman who does 50 deep knee bends in which her center of mass is lowered and raised 0.400 m. (She does work in both directions.) This is a statement of the workenergy theorem, which is expressed mathematically as. Like work and energy, power is a scalar quantity. Read and download free pdf of CBSE Class 9 Physics Work And Energy Worksheet Set A. How much work is done by the boy pulling his sister 30.0 m in a wagon as shown in Figure? FME 18 University of Phoenix Contaminant Scavenger Hunt Paper. Taking a half hour on the ascent will surely irritate riders and decrease ticket sales. *Click on Open button to open and print to worksheet. The driver lets the car coast farther down the hill, then up and over a small crest. 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. (a) \(\displaystyle 2510^6years\) Work Energy Power - Worksheet problem solution (Q1) A block of mass 1 kg slides down on an inclined plane of inclination 60 degrees. 79. One kilowatt-hour is the work done in one hour by an agency whose power is one kilowatt. What is the force constant \(\displaystyle k\) of the spring? A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Note that there are on the order of \(\displaystyle 10^{11}\) observable galaxies, the average brightness of which is somewhat less than our own galaxy. Work done on a system puts energy into it. (a) \(\displaystyle 4.6510^3kcal\) I expect you to assure a high grade on this assignment. I need a high score. Here the force F is making an angle with the surface on which the body is moved. End of Preview - Want to read all 4 pages? Methods of Separation of Mxiture 12. Worksheet contains 87 MCQs from the past 10 years past papers. (b) How many flights is this if each flight has 16 stairs? The work we do on the rock also equals the rocks gain in gravitational potential energy, PEe. What relationship between accumulation and ablation is necessary for glaciers to form? Work And Power. The work required to remove a proton or a neutron from a nucleus has a typical magnitude of several M eV (106eV). I will attach an PDF file so you can start to work on it. (b) 0 (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? In this chapter we will be concerned with mechanical energy, which comes in two forms: kinetic energy and potential energy. What is the relationship of potential energy to conservative force? The world would never be the same. Momentum, Work, Power, and Energy multiple choice by tassiebadenhorst: Work and Energy, Science, Class - 4 by vickysuba313: Iv science-3work and energy by santhoshhari: 10. (b) \(\displaystyle 2.54 y\). 4. Complete the assignment in this MS Word document. fd 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. This corresponds to an obtuse angle between the force and displacement vectors. (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 \(\displaystyle f=Fma\). (c) This power output is higher than the highest value on [link], which is about 35 kcal/min (corresponding to 2415 watts) for sprinting. Test Day: 4. On the time taken? Ask students how they think the resulting changes in lifestyle compare to more recent changes brought about by innovations such as air travel and the Internet. How many grams of fat will you gain if you eat 10,000 kJ (about 2500 kcal) one day and do nothing but sit relaxed for 16.0 h and sleep for the other 8.00 h? What is the efficiency of a subject on a treadmill who puts out work at the rate of 100 W while consuming oxygen at the rate of 2.00 L/min? 23. 62. Ask them to provide more examples until they understand the difference between the scientific term work and a task that is simply difficult but not literally work (in the scientific sense). Work, Power and Energy Worksheet Work and Power 1. 4. The work on the body is done by force. A tugboat pulls a ship with a constant net horizontal force of 5.00 X 103N and causes the ship to move through a harbor. Physics Worksheet Work and Energy - Reload Open Download 2. What are the harmful impacts?What is the route of exposure, meaning how does the actual exposure to the harmful contaminants occur? For example, in roller coaster design, the amount of time it takes to lift a roller coaster car to the top of the first hill is an important consideration. 15. Solution: When a force F acts on an object to move it in its direction through a distance S, work is done. It is defined as: The amount of work is one joule when a force of one newton displaces a body through one meter in the direction of the force.. Solution: Given data: time=t= 4s Work =W = 20J Power =P=? Enter the email address associated with your account, and we will email you a link to reset your password. 58. (This small conversion efficiency is due to the devices themselves, and the fact that the sun is directly overhead only briefly.) (c) Discuss the magnitude of the force with glove on. 56. Give an example of a situation in which there is a force and a displacement, but the force does no work. Work and energy are closely related. 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. A weightlifter lifts a 200 N barbell from the floor to a height of 2 m. How much work is done? The average force of friction including air resistance was 700 N. Assume all values are known to three significant figures. (c) Given this power, what is the average force of air resistance if the airplane takes 1200 s? Work Energy Theorem The video introduces the work energy theorem, provides the definition of the work-energy Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (c) If he continues to exert this force and to experience the same air resistance when he reaches a level area, how long will it take him to reach a velocity of 10.0 m/s? It requires many cognitive abilities to make the University of Central London Physics Motion Questions. Is James Watt thinking about watts? ) on the TV, because they have moved the same mass over the same vertical distance, which requires the same amount of upward force. (a) What is the magnitude of the force exerted to keep the car moving at constant speed? =fmg If you do not submit the map figure your assignment will not be graded. Work, Energy and Power 6. (c) Does the answer surprise you? This implies that \(\displaystyle PE >> KE_i\). Our special definition of the word work does not correspond to the colloquial usage of the term. This limitation was okay for simple tasks like pumping water or mashing potatoes, but did not work so well for moving a train. Notes: Power, Efficiency. 2 Solution 2 Specifically, is it likely that exercise alone will be sufficient to lose weight? Discuss the relative effectiveness of dieting and exercise in losing weight, noting that most athletic activities consume food energy at a rate of 400 to 500 W, while a single cup of yogurt can contain 1360 kJ (325 kcal). Give some examples of each. The carriage with the baby weighs 12 N. The carriage has poitahial energy. Click on pop-out icon or print icon to worksheet to print or download. Insert this into the expression for power and solve: This book uses the The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo Work done against these forces is always dissipated by being converted into non usable forms of energy like heat, light, sound etc. (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. If the efficiency of a coal-fired electrical generating plant is 35%, then what do we mean when we say that energy is a conserved quantity? W=fd . (d) How much work went into thermal energy? 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. (This could be the amount of heavy snow on 20 m of footpath.). The topics include solving for work, kinetic energy, gravitational potential energy, Q=mct, power, efficiency and mechanical energy. The joule is named after physicist James Joule (18181889). National Institute Of Mental Health Search Results, Gina Wilson All Things Algebra Evaluating Expressions, 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. \(\displaystyle F=f+w=600 N+mgsin\) These worksheets cover physics, chemistry, and meteorology. (a) Work is said to be done by a forte only when the body moves. 44. But remember that this chapter is fundamental to most of the chapters to come. (See [link] for the energy content of gasoline.). 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. A baby carriage is siting at the top of a hill that is 21 m high. Our mission is to improve educational access and learning for everyone. Impulse Momentum Exam 1 and Problem Solutions End the section by clearing up any misconceptions about the distinctions between force, work, and power. (c) \(\displaystyle 1.410^4 kg\) (14 metric tons). 60. Calculate the work done by a 47 N force pushing a pencil 0.26 m. 2. We say this because the applied force causes not the displacement of the weight. unit of energy is joule. Force, F = 25 N. Displacement, dr = 15 m. Angle between F and dr, = 30o. (a) \(\displaystyle 9.4610^7J\) But often we need to know quickly work is done. 28. Solution 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. 50. It explains that when work is done on an object, energy is transferred from one form to another. Cell 16. order given. Work, Energy, Power Worksheet - More numerical problems to solve 1 ) A block of mass 1 kg slides down on an inclined plane of inclination 60 degrees. (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? Consider a particle acted on by a constant force F, and assume the simplest case in which the motion takes place in a straight line in the direction of the force. (b) How much work does she do if her center of mass rises 0.240 m? The last example is less obvious. 6. Object must move Are you in need of an additional source of income? Work and Energy Worksheet - #1. Give an example for each statement. Click on pop-out icon or print icon to worksheet to print or download. Power can be expressed in units of watts (W). A person holding a heavyweight at rest in the air may be working hard in the physiological sense, but from the point of view of physics, that person is not doing any work on the weight. . 75. When the force has no component in the direction of motion, then no work is done by the force. Units and Repeat the information on kinetic and potential energy discussed earlier in the section. Here we have given Class 9 NCERT Science Textbook Solutions for Chapter 11 Work Power and Energy. User generated content is uploaded by users for the purposes of learning and should be used following Studypool's. 83. Although the force F is an invariant, independent in both magnitude and direction of our choice of inertial frames, the displacement S is not. Define Energy You serve a volleyball with a mass of 2.1 kg. You (or an object) also expend energy to do work. (This is because the initial kinetic energy is small compared with the gain in gravitational potential energy on even small hills.) W=fd On the height of the shelf? The avalanche releases a great amount of energy. Hydroelectric facility (credit: Denis Belevich, Wikimedia Commons). Period The more mass an object has the (more / less) potential energy it has. What is The International System of Units? Does this rating depend on how long the appliance is on? Metabolism 18. Where does it come from?Where is the product located in the house?Describe how the contaminant affects plants and humans. )5.What landforms indicate the previous influence of glaciationin the valleys below the Athabasca, Victoria, Lefroy, and Bow Glaciers? In the metric system this unit is usually seconds. 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. Calculate the work done by a 2.4 N force pushing a 400. g sandwich across a table 0.75 m wide. Array Addition For Second Grade Worksheets, Helathy Boundaries In Relationships Worksheets. (b) What average force did he exert on the floor? Learny Kids; Home; Common Core. Worksheet will open in a new window. (b) \(\displaystyle 62.5 N\) Solution (C. H. Jeens, Wikimedia Commons). Now suppose that the drive we are. 2 (c) How much waste heat transfer in kilojoules will she generate in the process? This unit can be used to measure power related to any form of energy or work. 1. Power Define the general definitions of the words potential and kinetic. (a) Find the useful power output of an elevator motor that lifts a 2500-kg load a height of 35.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Explain why it does no work. A toy car moves up a sloped track. 1. A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. ( The work required to remove and outer electron from an atom has a typical magnitude of several electron volts (eV). Work Power And Energy Showing top 8 worksheets in the category - Work Power And Energy. In Example, we calculated the final speed of a roller coaster that descended 20 m in height and had an initial speed of 5 m/s downhill. This was natural because pistons move in and out as the pressure in the chamber changes. If you are redistributing all or part of this book in a print format, A toy gun uses a spring with a force constant of 300 N/m to propel a 10.0-g steel ball. What is the cost of operating a 3.00-W electric clock for a year if the cost of electricity is $0.0900 per \(\displaystyle kWh\)? 57. 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.
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