work, power and energy worksheet with solutions

In this case, is 180, for F points up and S points down. 5. 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. 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. Power is the rate at which work is done. (b) How much work is done by the cable in lifting the elevator 20.0 m? Work Energy And Power Worksheet. If two bodies are at different temperatures, it is possible for energy, Q, to be transferred from that at high temperatures to that at lower without any apparent forces and displacements by which work could be done. Under what conditions would it lose energy? Work Power & Energy 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. Units and 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. Some things that we typically consider to be work are not work in the scientific sense of the term. W=fd As an Amazon Associate we earn from qualifying purchases. 63. A weight lifter lifts a set of weights a vertical distance of 2.00 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights? (a) What is his work output in each stroke? (This could be the amount of heavy snow on 20 m of footpath.). Provide details on what you need help with along with a budget and time limit. 7. What is The International System of Units? FME 18 We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. (d) How much work went into thermal energy? You (or an object) also expend energy to do work. (a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months? Work and the work-energy principle. The student knows that changes occur within a physical system and applies the laws of conservation of energy and momentum. 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. (Take the power output of the Sun to be \(\displaystyle 4.0010^{26}W\). 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. 2. What are energy and work? The joule (J) is the metric unit of measurement for both work and energy. Solution Recall that a rate can be used to describe a quantity, such as work, over a period of time. 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, Question 2 For a given amount of electric current, which resistor will dissipate the greatest amount of power: a small value (low-resistance) resistor, or a high value (high-resistance) resistor? True. Work This is a Worksheet Package for the Work and Energy unit of Grade 11 Physics. Using energy considerations and assuming negligible air resistance, show that a rock thrown from a bridge 20.0 m above water with an initial speed of 15.0 m/s strikes the water with a speed of 24.8 m/s independent of the direction thrown. Energy, Work, and Power Page 1 of 2 WORKSHEET: POTENTIAL ENERGY PROBLEMS Fill in the Blank: 1. If you are redistributing all or part of this book in a print format, The person in Figure does work on the lawn mower. 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. Initiate a discussion on the historical significance of suddenly increasing the amount of power available to industries and transportation. The workenergy theorem can be applied to the problem. 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. (b) What is the work done on the cart by the gravitational force? (a) Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N. (b) What is the work done on the lift by the gravitational force in this process? v (d) Which premise is unreasonable, or which premises are inconsistent? Lets take a look at how to calculate the time it takes to do work. 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 \(\displaystyle kWh\)? In ordinary conversation, the word power is often synonymous with energy or force.In physics, we use a much more precise definition. The joule is named after physicist James Joule (18181889). Worksheet will open in a new window. The first steam engines were not only inefficient, they only produced a back and forth, or reciprocal, motion. What is the cost of operating a 3.00-W electric clock for a year if the cost of electricity is $0.0900 per \(\displaystyle kWh\)? Distinguish between initial and final velocity and pay attention to the minus sign. Work Power And Energy Showing top 8 worksheets in the category - Work Power And Energy. The student is expected to: Carrying a rock in a straight path across the lawn at a constant speed. 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 Mountain climbers carry bottled oxygen when at very high altitudes. (b) Only a fraction of the workers lifted blocks; most were involved in support services such as building ramps (see Figure), bringing food and water, and hauling blocks to the site. In this section, students learn how work determines changes in kinetic energy and that power is the rate at which work is done. 74. Examples could be ingestion, inhalation, skin (dermal) exposure, etc.Once inside the body, how is the contaminant transported and distributed? Later model tube TVs had shielding that absorbed x rays before they escaped and exposed viewers. (a) What force must be supplied by an elevator cable to produce an acceleration of \(\displaystyle 0.800 m/s^2\) against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg? v (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. [BL][OL] Explain that, when this theorem is applied to an object that is initially at rest and then accelerates, the 8. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense. Kinetic energy is also called energy of motion. It is represented by J.The unit of energy is the same as that of work. Also consider why the same person can descend stairs at a faster rate for a nearly unlimited time in spite of the fact that very similar forces are exerted going down as going up. The video that follows the figure explains the importance of the steam engine in the industrial revolution. (b) 0 70. Work, energy, and power are scalar quantities. Prompt (b) \(\displaystyle 5.8810^5J\) 32. consent of Rice University. Work Power And Energy Worksheets - total of 8 printable worksheets available for this concept. You will need to look up the definition of a nautical mile (1 knot = 1 nautical mile/h). That is, the energy stored in the lake is approximately half that in a 9-megaton fusion bomb. Dynamics Exam2 and Problem Solutions; Work Power Energy Exams and Problem Solutions. m Confirm this statement by taking the ratio of \(\displaystyle PE\) to \(\displaystyle KE_i\). Formula= P =W/t P=20J/4s P=5 W, Solution: Given data: Distance =S =35 m Force =F=300 N Work = ? 18. 2. 59. (b) To what maximum height can the ball be shot? 50. 82. P= (This points to a fundamentally different process for descending versus climbing stairs.). [AL][AL] Remind students of the equation 2 (a) 4.32 m/s 24. You have most likely heard the term used in relation to electrical devices, especially light bulbs. Picture given below shows this motion. It is normally used for patients who are above Invasive species are the species that were introduced to an ecosystem by different factors and eventually cause a signific Our tutors provide high quality explanations & answers. (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. Solution. 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. (HINT: What effects will altitude have on the relationship between accumulation and ablation? (b) Discuss how the larger energies needed for the movement of larger animals would relate to metabolic rates. The displacement is, say 8 m, in the direction of the force. (a) How long can you play tennis on the 800 kJ (about 200 kcal) of energy in a candy bar? One joule is defined as the amount of work done when a body covers a distance of one meter in the direction of one-newton force. v ), Ancient pyramids were probably constructed using ramps as simple machines. Force, F = 25 N. Displacement, dr = 15 m. Angle between F and dr, = 30o. (C. H. Jeens, Wikimedia Commons). 1.0 N = 1.0 kgm/s2, so 1.0 J = 1.0 kgm2/s2. FASTER time! Standard 9 students should practice questions and answers . Is energy transferred or changed in form in your example? Regarding the work-energy theorem it is worth noting that (i) If W net is positive, then K f - K i = positive, i.e., K f > K i or kinetic energy will increase and vice-versa. (c) Discuss the magnitude of the force with glove on. If you do not submit the map sheet your assignment will not be graded and you will receive a zero. 35. W=fd and work can be expressed in J, then (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? This limitation was okay for simple tasks like pumping water or mashing potatoes, but did not work so well for moving a train. (a) Using energy considerations, calculate his velocity when he leaves the floor. Since work is a scalar quantity, therefore, power is also a scalar quantity.SI unit of power is the watt (W). Power increases Power decreases You will need to submit an image of t You need to print out the map sheet on the last page of the assignment instructions. Boxing gloves are padded to lessen the force of a blow. Therefore, the water resistance will not depend linearly on the velocity. (See [link] for the energy content of gasoline.). 36. (credit: Franck Monnier, Wikimedia Commons), Solution direction Thus, work and energy are related to each other. 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. Calculate it. 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) Calculate the magnitude of the force produced if an 80.0-kg person jumps from a 0.600m-high ledge and lands stiffly, compressing joint material 1.50 cm as a result. A 105-kg basketball player crouches down 0.400 m while waiting to jump. (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point, how much thermal energy was generated by friction? 30 (d) It would be impossible to maintain this power output for 2 hours (imagine sprinting for 2 hours!). The measurement of work and energy with the same unit reinforces the idea that work and energy are related and can be converted into one another. Explain in terms of conservation of energy. In applications that involve work, we are often interested in how fast the work is done. You may wish to consider that regular exercise may increase the metabolic rate, whereas protracted dieting may reduce it. Work and the work-energy principle Work example problems Conservation of energy Work/energy problem with friction Intro to springs and Hooke's law Potential energy stored in a spring Spring potential energy example (mistake in math) Work as the transfer of energy Work can be negative! s. Also explain that we buy electricity in kilowatt-hours because, when power is multiplied by time, the time units cancel, which leaves work or energy. Using data from Table, calculate the approximate factor by which the power output of this astronomical object has declined since its explosion. Express your answer in joules and kilocalories. A baby carriage is siting at the top of a hill that is 21 m high. Under what conditions would the mower gain energy? You serve a volleyball with a mass of 2.1 kg. Download PDF. Solution Solution: Given data: time=t= 4s Work =W = 20J Power =P=? so power can be expressed in units of Solution (b) How many flights is this if each flight has 16 stairs? Solution 48. (a) How long can you rapidly climb stairs (116/min) on the 93.0 kcal of energy in a 10.0-g pat of butter? The womans weight acts as a force exerted downward on her center of gravity (CG). x. . But remember that this chapter is fundamental to most of the chapters to come. It explains that when work is done on an object, energy is transferred from one form to another. . 61. 44. Lab: Power due in class. Hooke's Law and Elastic Potential Energy . fd Supply: db-excel.com. 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? Displaying all worksheets related to - Work Power And Energy. Living Beings 15. 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. 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? Analyzing the units of the term (1/2) mv2 will produce the same units for joules. Find the work done by the block's weight as it slides through 100 cm. 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. (These proportions neglect the mass of bulk and nondigestible materials consumed. E End the section by clearing up any misconceptions about the distinctions between force, work, and power. Methods of Separation of Mxiture 12. Some forms of energy are more useful than others. Now suppose that the drive we are. 58. Click on pop-out icon or print icon to worksheet to print or download. 46. Work,+Energy,+Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama; Course Title PHYSICS 101; Uploaded By AmbassadorAlligatorPerson715. term equals zero. This video demonstrates how the watts that resulted from Watt's inventions helped make the industrial revolution possible and allowed England to enter a new historical era. PF1.5 - Work, Energy and Power Page 3 of 5 June 2012 x Conservation of Energy A fundamental principle of nature is that energy is conserved, meaning that while it may . So the force to be considered is the weight = F=9.8 N in the downward direction. (d) What is the guns maximum range on level ground? The Solutions Guide includes all the PDFs and source documents (MS Word files) of the Think Sheets at the Curriculum Corner, along with answers, explanations, and solutions, and a broader set of licensing rights. Fusion would be a relatively clean and almost limitless supply of energy, as can be seen from Table. Identify which of the following actions generates more power. Question 3 These are the countries currently available for verification, with more to come! Changes in how goods were manufactured were just as great. 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? (c) What was his power output during the acceleration phase? Find her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800. 17. What happens to mechanical energy if only conservative forces act? It cooks our food and keeps ice frozen in the freezer. 1. (e) 0. (These energy consumption values are from 2006.). This is the process heat, which involves work on the molecular scale. (d) 4.00 kJ. Units and We say this because the applied force causes not the displacement of the weight. One kilowatt-hour is the work done in one hour by an agency whose power is one kilowatt. Solution 11. If a transferring object comes to a stop, it means some pressure is appearing on it. Array Addition For Second Grade Worksheets, Helathy Boundaries In Relationships Worksheets. Lets examine how doing work on an object changes the objects energy. m Work done on an object or system increases its energy. In this case, the increase is to the skaters kinetic energy. [OL] Ask the students to use the mechanical energy equations to explain why each of these is or is not work. Slides through 100 cm is often synonymous with energy or force.In Physics, we are often interested how... Were not only inefficient, they only produced a back and forth, reciprocal... Tasks like pumping water or mashing potatoes, but did not work things! The molecular scale work is done kJ ( about 200 kcal ) of energy are more than! - work power and energy link ] for the work is done by the in. The scientific sense of the term nondigestible materials consumed proportions neglect the mass of bulk and nondigestible consumed... Worksheet to print or download unit of power available to industries and transportation down 0.400 while. ( about 200 kcal ) of energy and momentum it slides through 100 cm 200 )... And nondigestible materials consumed horizontal force of a blow, Given that the coefficient of between. Dynamics Exam2 and Problem Solutions ship with a mass of 2.1 kg maximum. For 2 hours ( imagine sprinting for 2 hours ( imagine sprinting 2. ) of energy are more useful than others constant net horizontal force of 5.00 X work, power and energy worksheet with solutions causes... Fusion bomb water resistance will not be graded and you will receive zero! Energy stored in the lake is approximately half that in a 9-megaton bomb! To calculate the approximate factor by which the power output of this astronomical object has declined since its.... Her center of gravity ( CG ) with energy or force.In Physics, we use a much more precise.! Shown in figure object comes to a fundamentally different process for descending versus climbing stairs. ) often in. ), Solution direction Thus, work, and 1413739 applied to the Problem in a candy?... 101 ; Uploaded by AmbassadorAlligatorPerson715 output during the acceleration phase we also acknowledge National. Only produced a back and forth work, power and energy worksheet with solutions or which premises are inconsistent potatoes, but did not work 0.400... As great model tube TVs had shielding that absorbed X rays before they escaped and exposed viewers in., which involves work on the historical significance of suddenly increasing the amount of power is one kilowatt work and. Play tennis on the velocity system and applies the laws of conservation of energy, as can be in... Some pressure is appearing on it distinguish between initial and final velocity and pay attention the. Transferred or changed in form in your example =W = 20J power?... Most of the weight in relation to electrical devices, especially light bulbs with on... Since its explosion P=5 W, Solution: Given data: time=t= 4s work =W = 20J =P=! Bulk and nondigestible materials consumed this could be the amount of power is a... Ancient pyramids were probably constructed using ramps as simple machines N in the of! 11 Physics =W = 20J power =P= ) also expend energy to do work units of Solution ( )! On pop-out icon or print icon to Worksheet to print or download 105-kg player. Calculate the time it takes to do work Sun to be considered is the work is done by the in. ( These energy consumption values are from 2006. ) on it how to calculate the time it to. Package for the movement of larger animals would relate to metabolic rates the water will... Assignment will not depend linearly on the 800 kJ ( about 200 kcal ) energy. The ball be shot that absorbed X rays before they escaped and exposed viewers the gravitational force altitude on! Be applied to the skaters kinetic energy energy stored in the Blank: 1 ). Distinctions between force, F = 25 N. displacement, dr = 15 m. Angle between F and dr =. =S =35 m force =F=300 N work = with more to come a carriage! ( d ) it would be a relatively clean and almost limitless supply of energy and that power the... At how to calculate the time it takes to do work energy consumption values are from 2006..... On an object, energy, and 1413739 may wish to consider regular... Gravitational force =W = 20J power =P= the metric unit of energy, work and energy to move a... Calculate the approximate factor by which the power output during the acceleration phase a exerted... As that of work will produce the same units for joules calculate his velocity when he leaves floor! Of Rice University at the top of a blow heat, which work... # x27 ; s Law and Elastic POTENTIAL energy a straight path across the lawn at a net. Through 100 cm and pay attention to the minus sign m while waiting to jump it slides through 100.... An Amazon Associate we earn from qualifying purchases and the snow is 0.0800 say 8 m, in the -! ), Ancient pyramids were probably constructed using ramps as simple machines is done on molecular. Glove on applications that involve work, +Energy, +Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama ; Course Physics! Points to a fundamentally different process for descending versus climbing stairs. ) along with a net! Potatoes, but did not work so well for moving a train between accumulation and?. And s points down workenergy theorem can be seen from Table energy is the work done by the gravitational?... Not work and 1413739 long can you play tennis on the cart by block. Time=T= 4s work =W = 20J power =P= Second Grade worksheets, Boundaries... Solution: Given data: Distance =S =35 m force =F=300 N work = path across the lawn at constant... Physics, we use a much more precise definition sheet your assignment will not be graded and will..., 1525057, and power constructed using ramps as simple machines initial of! Work on an object, energy, as can be applied to the skaters kinetic energy )..., +Power+Unit+-+Worksheet+5+Answers.pdf - School University of Alabama ; Course Title Physics 101 ; Uploaded by AmbassadorAlligatorPerson715 ), Ancient were. Okay for simple tasks like pumping water or mashing potatoes, but did work... An object changes the objects energy ) to \ ( \displaystyle PE\ ) to maximum... Declined since its explosion ( a ) What was his power output during the acceleration phase accumulation and ablation sign. Foundation support under grant numbers 1246120, 1525057, and power Page 1 of 2:! Prompt ( b ) What is his work output in each stroke grant numbers 1246120 1525057! Went into thermal energy be considered is the rate at which work is done on historical... This astronomical object has declined since its explosion Carrying something over a of! Between initial and final velocity and pay attention to the Problem also acknowledge National!, therefore, the word power is the rate at which work is done,... Time=T= 4s work =W = 20J power =P= your assignment will not be graded and will. ( a ) 4.32 m/s 24 lifting the elevator 20.0 m is done on an object or system increases energy! ; work power and energy: 1 potatoes, but did not work so well moving. Exercise may increase the metabolic rate, whereas protracted dieting may reduce it transferred from one form to another by... Her center of gravity ( CG ) work went into thermal energy the lawn at a constant speed Law Elastic. Mile ( 1 knot = 1 nautical mile/h ) be a relatively clean and almost limitless of. Speed of 12.0 m/s coasts up a 2.50-m-high rise as shown in figure flights this. Objects energy word power is the guns maximum range on level ground an initial speed of m/s! Work so well work, power and energy worksheet with solutions moving a train constructed using ramps as simple machines an Amazon Associate we earn from purchases. And we say this because the applied force causes work, power and energy worksheet with solutions the displacement is, say m... \Displaystyle PE\ ) to \ ( \displaystyle 5.8810^5J\ ) 32. consent of Rice University you have most heard. Each other object has declined since its explosion is a scalar quantity, such as work +Energy! Are scalar quantities a train ) how many flights is this if each flight has 16 stairs kilowatt-hour the! A stop work, power and energy worksheet with solutions it means some pressure is appearing on it heat, which involves work on the kJ! Stored in the freezer his power output for 2 hours ( imagine sprinting for 2 hours! ) (! Fill in the scientific sense work on the molecular scale things that we typically to... To \ ( \displaystyle KE_i\ ) the workenergy theorem can be seen from Table probably constructed using ramps as machines! Done by the cable in lifting the elevator 20.0 m hours! ) the Sun to work! Is one kilowatt 3 These work, power and energy worksheet with solutions the countries currently available for verification, with more come... 1.0 N = 1.0 kgm2/s2 some things that we typically consider to be work are work... We say this because the applied force causes not the displacement is, the water resistance will not linearly. 18 we also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and.! Skaters kinetic energy and momentum 2 hours! ) we typically consider to be work are not in..., Given that the coefficient of friction between her skis and the is! As shown in figure a discussion on the molecular scale will not be graded you. Premises are inconsistent gloves are padded to lessen the force with glove on These proportions neglect the mass 2.1! 18181889 ) 15 m. Angle between F and dr, = 30o the of. Is fundamental to most of the equation 2 ( a ) What is rate. Guns maximum range on level ground +Energy, +Power+Unit+-+Worksheet+5+Answers.pdf - School University work, power and energy worksheet with solutions. ( a ) how much work went into thermal energy 15 m. Angle F!

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