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WORK,ENERGY AND POWER Part I

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WORK,ENERGY AND POWER
Part I
1. What is the formula for work? A. Force x Distance B. Distance/Force C. Force/Distance 2. What is the relationship between Work, Force, and Distance? A. Work is the what you get when a force acts over a certain distance. Therefore, without distance or force there would be no work. B. Work and Distance are related because force is acted over a long distance. C. Without work you do not have force. 3. What are the units for work? A. Watts, and Joules B. Dollars, and Euros C. Newton Meter, and Joules 4. If you exert a force of 800 newtons, and the object moves 10 meters how much work did you do? A. 8000 Joules B. 80 Joules C. 80,000 Joules 5. What is Energy, and how does it relate to work? A. Energy is the ability to do work or make work, and without it work not is done. B. Energy causes a change, and work is needed for energy to happen. C. Energy is the ability to do work or cause a change, and work is the transfer of energy. 6. What is the unit of measurement for energy? A. Watts B. Joules C. Newtons 7. What are the differences between Kinetic and Potential energy. A. Kinetic energy is the energy of motion, and potential energy is stored energy B. Potential energy is the energy of weight, and kinetic energy is the energy of nuclear atoms. C. Potential energy is the energy of speed, and kinetic energy is the stored energy. 8. Examples of Potential Energy are? A. Gravielastic energy, and Joules B. Gravitational potential energy which is dependent on the height of the object. C. Nucleus potential energy, depending on the amount of nuclear power. 9. What is the formula for G.P.E, and do a calculation. A. GPE= 1/2 Mass X Velocity 10kg x 54m/s = 540 540/2= 270 B. GPE= M x G x H 5kg x 10x 2m = 100 Joules C. GPE= M x G x H 5kg x 10x 2m = 100 Watts 10. What is the difference between Elastic Potential Energy and GPE A. GPE is potential energy that's dependent on height, EPE is energy associated with objects that can be stretched or compressed B. GPE is potential energy dependent on weight only, and EPE is the potential energy only found in rubber bands. C. GPE and EPE are the same, but are not written the same way. 11. What is the formula for Kinetic Energy. A. 1/2 Mass x Velocity squared B. Mass x Velocity x 2 C. Velocity / Mass x 1/2 12. When is there more GPE in a swinging pendulum? A. At the top B. At its lowest point C. In between the top, and the lowest point
Part II
1. Mary pushes her cart across the floor with a force of 150N for a distance of 10m. What is the work done on the cart? A. 140 joules B. 200 joules C. 15 joules D. 1500 joules
2. If Nancy pushes an object with twice the force for half the distance, she does A. The same work B.Twice the work C. Half the work D. Four times the work 3. How much work is done on a 10kg rock that you lift 10m straight up? A. 500 joules B. 10 joules C. 1000 joules D. 1 joule 4. Change in quality of environment that can be harmful and unpleasant for living things is called A. Energy B. Pollution C.Revolution D. Transformation 5. The energy possessed by a body due to its position is called its A. Heat energy B. Kinetic energy C. Potential energy D. Chemical energy 6. Work is being done only when a force is _______________ an object. A. with B. Moving C. Next to D.Stationary 7. Work is done when a force moves an object a certain ______________ A. Distance B. Way C. Energy D. Temperature 8. When a force acting on a body displaces it in direction of a force then A. Uniform velocity occurs B. Uniform speed occurs C. Work is done D. Equilibrium take place 9. When a moving object has the energy of motion it has this type of energy. A.Potential energy B. High energy C. Kinetic energy D. Transfer energy 10. A moving car possesses A. Sound energy B. Mechanical energy C. Heat energy D. Chemical energy
Part III
1. A solar collector heats the water in the water tank of a home. Which energy transformation equation best describes this situation? A. Radiant --> thermal B.Radiant --> electrical C. Radiant --> gravitational --> electrical D. Radiant --> gravitational --> thermal E. Radiant --> thermal --> electrical
2. The amount of work done when a 80.00-kg person jumps 1.000 m into the air in 0.5000 s is A. 292.0 J B. 40.00 J C. 784.00 J D. 1568 J E. 160.0 J 3. The amount of work done to stop a bullet travelling through a tree trunk a distance of 50 cm with a force of 2.00 ´ 102 N is A.
–
4.00 x 102 J B. +4.00 x 102 J C. +1.00 x 102 J D.
–
1.00 x 102 J E. +1.00 x 104 J 4. A person lifts a pail of water of mass of 1.50 kg from the ground to a deck, 1.00 m above the ground. How much work was done by gravitational force on the pail of water? A.
–
14.7 J B. +1.50 J C.
–
1.50 J D. +0.153 J E. +14.7 J 5. In which case is negative work done? A. The work done by Earth on a ball as the ball, which was initially at rest, falls 3.0 m down towards Earth. B. A eastward force is applied to an eastward moving soccer ball that is already moving at a constant velocity to increase its speed in that direction. C. A cart is moving at a constant velocity of 10 m/s [W] when a 0.5 N [downward] force is applied. D. The work done by Earth on an arrow as it is fired 200 m straight up into the air. E. Earth applies a force on the Moon as the Moon travels one completion rotation in orbit around Earth. 6. In which case is positive work done? A. The work done by air resistance on a ball as the ball, which was initially at rest, falls 3.0 m down towards Earth. B. A eastward force is applied to an eastward moving soccer ball that is already moving at a constant velocity to increase its speed in that direction. C. Earth applies a force on the Moon as the Moon travels one completion rotation in orbit around Earth. D. A cart is moving at a constant velocity of 10 m/s [W] when a 0.5 N [downward] force is applied. E. The work done by Earth on an arrow as it is fired 200 m straight up into the air. 7. An elevator motor lifts a load of 2500 kg a height of 12.0 m in 3.00 seconds. The energy required by the motor to accomplish this task is 300 000 J. What is the efficiency of the elevator? A. 10.0% B. 98.0% C. 30.0% D. 102% E. 8.17% 8. In the following figure, a 0.60-kg ball is about to fall to the step below. The gravitational potential energy of the ball relative to the step is A. 8.8 x 101 J B. 2.9 x 101 J C. 6.0 x 100 J D. 3.0 x 100 J E. 5.9 x 101 J 9. Jughead (m = 60 kg), Archie (m = 65 kg), and Reggie (m = 70 kg), all decide to run up a flight of stairs
at with a height of 4.0 m at constant speed at good ol’ Riverdale High. If all three achieve this task in a
time of 3.5 seconds, who generates the most power? A. Jughead
B. Archie C. Reggie D. They all generate the same amount of power E. Not enough information is provided to answer this question 10. During a recent NBA basketball game, Jose Calderon, a guard with the Toronto Raptors, threw a basketball into the crowd in an unsportsmanlike manner. Which one of the following statements about the basketball is FALSE? A. As the basketball rises, its kinetic energy decreases B. As the basketball rises, it is accelerated downward C. As the basketball rises, its potential energy increases D. When the basketball reaches the top of its flight, its kinetic energy is zero E. When the basketball reaches the top of its flight, acceleration is still g 11. Nicholas exerts a certain force to lift a dumbell 3.0 m straight above his head in 20 s. If he had completed the same task in 10 s, the energy he would need to use would be A. Twice as great B. The same C. Four times as great D. Half as great E. Cannot be calculated using the given information 12. If Elio pushes against an immobile wall with twice as much force as Jordan, which of the following is TRUE? A. Elio is doing twice as much work as Jordan. B. Elio generates twice as much power as Jordan. C. Elio is doing four times as much work as Jordan. D. No work is being done by Elio or Jordan. E. They both generate power in equal amounts.
Part IV
1. Which of the following has the most potential energy? A. A car at the top of a hill. B. A car speeding down the hill. C. A person at the top of a hill. 2. What is potential energy? A. The stored energy of an object due to its position or condition. B. The energy an object has due to its motion. C. The energy an object might have if it existed. 3. What is kinetic energy? A. The energy that an object gains from some outer source. B. The energy that an object possesses due to its motion. C. The energy created by water. 4. What is an example of kinetic energy at work? A. A ball lodged in a tree. B. A frisbee flying through the air. C. A car in the garage.
5. What would have the greatest kinetic energy? A. A person running down a hill. B. A ball rolling down a hill. C. A car driving down a hill. 6. What has the least kinetic energy? A. An object that is not moving. B. A satellite orbiting in space. C. A car running at 5 mph. 7. When is kinetic energy transferred from one object to another? A. When the first object will crash with the second object. B. When both objects are force-crashed by a person. C.Both options are right 8. Can you create or destroy energy? A. Yes, only if you are stronger than this energy. B. No, you can not destroy an energy. C. It can be transformed or converted into another form.

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