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1. A 2 kg ball and a 4 kg ball move to the right at the same constant speed. Select the statement below that describes how their kinetic energies compare.

A. The more massive ball has twice the kinetic energy of the less massive ball.

B. The more massive ball has half the kinetic energy of the less massive ball.

C. The more massive ball has four times more kinetic energy than the less massive ball.

D. The more massive ball has four times less kinetic energy than the less massive ball.

radt,-(,7_ 6-377K II 9- j 2. A red truck and a blue truck travel at the same speed along a straight

flat road. The red truck is 3 times more massive than the blue truck. Compare their kinetic energy. A. The red truck and the blue truck have the same kinetic energy. B. The blue truck's kinetic energy is triple the red truck's

kinetic energy. C The red truck's kinetic energy is triple the blue truck's

kinetic energy. D The red truck's kinetic energy is nine times greater than the

blue truck's kinetic energy.

Ev 7 •15, N./ 3. Calculate the kinetic energy when mass is 5 kg and velocity is 8 m/s. A. 0.625J B. 40J C. 20J D. 160J

A EFL k. A 4. Two identical springs are used in an experiment. Spring A is

compressed 3 cm. If 50 Joules of energy is stored in Spring A and 200 Joules of energy is stored in Spring B, how far is Spring B compressed?

a. 3 cm b. 6 cm c. 12 cm d. 20 cm

5. A 40 kg cart increases velocity from 3 m/s to 6 m/s. Select the statement that describes the effect on kinetic energy. v 3 A z

Etc, 3 A Ek of the cart will remain constant since the mass stays the same. Ek of the cart will increase by 3 joules. Ek of the cart will quadruple. Ek of the cart will triple.

6. How can you decrease an object's kinetic energy? A. Increase the object's velocity. B. Decrease the object's velocity. C. Increase the height of the object's position. D. Decrease the height of the object's position.

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7. Ball 'Y' moves to the right at twice the velocity of ball 'X'. If the balls are the same mass, select the statement below that describes how their kinetic energies compare.

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A. Ball 'Y' has twice the kinetic energy of Ball 'X'. B. Ball 'Y' has half the kinetic energy of Ball 'X'. C. Ball 'Y' has four times more kinetic energy of Ball 'X'. D. Ball 'Y' has 1/4 the kinetic energy of Ball 'X'.

8. A 700 kg sports car speeds down the road at 20 m/s. What is the kinetic energy of the sports car?

A, 280,000J B. 28,000J

C. 140,000J D. 14,000J

9. A pair of skydivers jump from an airplane when the plane achieves an altitude of 10,000 meters. If Earl's gravitational potential energy is greater than Javon's immediately after they jump, select the statement that must be true. h tiFigau 11)--Aw:J

A. Earl and Javon have the same mass so their terminal velocities will be the same.

B. Earl has more mass than Javon. C. Earl has less mass than Javon. D. Earl falls faster than Javon.

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10. The path of a bouncing ball is shown above.,liThe mass of the ball is 0.3 kg. If the initial height _(h0) of the ball is 5 meters, select the most likely values for the gravitational potential energy of the ball at h1 and h2.

A. At h1, Eg = 15 J At h2, Eg = 10 J B. At h1, Eg = 150 J At h2, Eg = 100 J C. At hi, Eg = 10 J At h2, Eg = 5 J D. At h1, Eg = 100 At h2, Eg = 50J

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11. The gravitational potential energy of a red ball is greater than the gravitational potential energy of a blue ball. If the red and blue balls have the same mass, select the statement(s) that could be true: I. The red and blue balls are located in the same gravitational

fields and are located at different heights above the ground. The red and blue balls are located in different gravitational fields and are located at the same height above the ground.

III. The red and blue balls are located in the same gravitational fields and are located at the same height above the ground.

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A. I only B. II only C. Ill only D. I and II only E. II and III only

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fr 12, A ball rests at the top of a 1 meter tall ramp. The 2 kg ball begins rolling down the ramp. If the ball and ramp are a closed sysfem, what is the potential energy of the system? A. 1.96J B. 19.6J C. 196J D. 1960J

13, How can you increase an object's gravitational potential energy? A, Increase the object's velocity. B. Decrease the object's velocity. C.1 h C. Increase the height of the object's position. D. Decrease the height of the object's position.

14. Calculate the potential energy of a roller coas r when mass is 120 kg and height is 25 m.

C. 4.8 J D. 29,400 J

C6- - rn 11 ) J 15. Calculate the potential energy when mass is 12 kg, gravity is 9.8 m/s/s, and height is 2 m. A. 470.4J B. 24J C. 235.2J D. 58.8J

A. 3000J B. 37,500J

h 16. When an object is not moving, the energy stored due to its height is: A. Elastic energy

A. Dynamic energy B. Kinetic energy C. Potential energy

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17. The picture above shows a waterfall. Choose the pie chart that best represents the kinetic and gravitational potential energy of a water droplet falling in mid-air where the arrow is pointing. Assume no energy is dissipated in the waterfall. Circle the letter below the correct answer.

18. Electrical energy is the movement of electrons. For example, electrons move through the wires of your headphones so you can listen to music. What type of energy does this represent? A. Kinetic energy

A. Potential energy

B. Chemical energy

C. Thermal energy

19. When an object is moving, the energy due to its motion is: A. Elastic energy B. Dynamic energy C. Kinetic energy D. Potential energy

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20. A bowler releases a bowling ball at 5 m/s. the ball speeds up as it rolls down the ramp to the pins. Select the correct statement about the energies present at A, B, and C.

A. A: Ek>0 and Eg>0 B: Ek>0 and Eg>0 C: Ek>0 and Eg=0

B. A: Ek>0 and Eg>0 B: Ek>0 and Eg>0 C: Ek>0 and Eg>0

C. A: Ek=0 and Eg=0 B: Ek<0 and Eg>0 C: Ek>0 and Eg>0

D. A: Ek=0 and Eg>0 B: Ek>0 and Eg>0 C: Ek>0 and Eg>0

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21. The pendulum swings from A to B to C to D. Select the statement that is true a. The gravitational potential energy and kinetic energy is maximum at D. b. The gravitational potential energy and kinetic energy is maximum at C. c. At A, the gravitational potential energy is maximum and kinetic energy is minimum. d. At A, the gravitational potential energy and kinetic energy is minimum.

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V, C. 22. At position A, the 500 kg roller coaster car is_at rest.. As the coaster moves from A to B, 5000 Joules of energy is diuipated. Comparing position A to position B, which statement below concerning the energy transformation would be true?

A. The car at position B has 150,000 J of gravitational energy and 5000 J of kinetic energy.

B. The car at position B has 150,000 J of kinetic energy and 5000 J of gravitational potential energy.

C. The car at position B has 145,000 J of gravitational energy and 0 J of kinetic energy.

D. The car at position B has 145,000 J of kinetic energy and 0 J gravitational energy.

MC.03 \ S kV/0-e_ K cjz : ) ;72-53 23. A 2 kg green cart and a 2 kg yellow cart travel along a straight flat track. The kinetic energy of green cart is 25 joules. If the yellow cart is moving at twice the speed of the green cart, how much kinetic energy does the yellow cart have?

D. 125 J A. 25J B. 50J C. 100J

C 24. A moving 10 kg ball has a kinetic energy of 45 joules. After 2

seconds, the kinetic energy of the 10 kg ball is 90 joules. Select the statement that describes the motion of the ball. —

A. The ball has maintained a constant energy. B. The ball has accelerated. C. The ball has maintained a constant velocity. D. The ball has decreased its velocity.

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— BOTTOM \i/V1/4)( 25. (/) The picture above shows a waterfall. Choose the pie chart that best

represents the kinetic and gravitational potential energy of a water droplet falling in mid-air where the arrow is pointing. Assume no energy is dissipated in the waterfall. Circle the letter below the correct answer.

26. The total potential and kinetic energy of an object is called: a. Mechanical energy b. thermal energy c. chemical chemical energy d. electrical energy

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27. Two objects with different masses are at rest on the same shelf. _.) Which object contains more energy? a. The object with greater mass has more energy. h kikt b. The object will less mass has more energy. c. Both object have the same energy. d. Neither object has energy since they are at rest.

28. An object has18 joules of potential energy and 30 joules of kinetic energy. How much mechanical energy would it contain?

a. 12 Joules b. 18 Joules c. 30 Joules d. 48 Joules

29. A spring is compressed 50 cm. If the spring coefficient is 10 N/m, how much energy is stored in it?

a. 1.00 J

f )( b. 1.25J 4 c. 2.50J d. 5.00 J

30. The Law of Conservation of Energy states that when one form of energy is converted to another form,

a. Energy is destroyed. b. No energy is destroyed. c. Energy is created. d. Some amount of energy cannot be accounted for.

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31. Where is pote-rtial energy greatest?

a. A b. D c. F d. G

1AT B EcL A = 6)3 E- 32. Two springs are used in an experiment. The springs have

different spring coefficients. Both springs are compressed the same distance. If 6 Joules of energy is stored in Spring—A and 24 J—oules of-energy is stored in Spring B, compare their spring coefficients.

a. A's spring coefficient is four times larger than B's spring coefficient.

b. A's spring coefficient is two times larger than B's spring coefficient.

c. B's spring coefficient is four times larger than A's spring coefficient.

d. B's spring coefficient is two times larger than A's spring coefficient.

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33. Calculate the kinetic energy of a roller coaster when the velocity is 0.2 m/s and mass is 1500 kg.

A. 30J B. 225,000J C. 2940J D. 300J

34. Energy is: a. the capacity to transform b. the ability to do work. c. Working on transformations. d. Mechanical.

35. Energy is measured in: a. Newtons b. Meters per second c. Joules d. Newtons/meter