Module 4 Test

Approximately how high would you have to lift the box to increase gravitational potential energy by 350 J?

• 3.6 m

• 2.5 m

• 4.2 m

• 5.0 m

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As you throw a ball, you exert a force on that ball of 4.2 N. You exert this force on the ball while the ball moves a distance of 0.50 m. The ball then leaves your hand and travels a horizontal distance of 8.5 m to your friend. How much work have you done on the ball?

• 2.1 J

• 5.0 J

• 10.0 J

• 15.0 J

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What are three ways that simple machines can make work easier?

• By increasing the force applied

• By changing the direction of the force

• By increasing the distance over which the force is applied

• By decreasing the amount of work done

• by increasing the friction

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An input force of 80 N is used to lift an object weighing 240 N with a system of pulleys. What is the mechanical advantage of the pulley system?

• 3

• 2

• 4

• 5

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What is the gravitational potential energy of an Earth-dictionary system if the dictionary has a mass of 5.0-kg and is located 2.0 m above the ground? Use the ground as the reference level.

• 98 J

• 50 J

• 20 J

• 10 J

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What is the kinetic energy from the motion of a 0.06-kg tennis ball traveling at a speed of 50 m/s?

• 75 J

• 50 J

• 100 J

• 25 J

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The graph shows the kinetic energy of a falling rock. According to the graph, what is the kinetic energy of the rock after it has fallen for 2 s?

• 100 J

• 200 J

• 300 J

• 400 J

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The graph shows the kinetic energy of a falling rock. If the rock has a mass of 1 kg, what is the speed of the rock after it has fallen for 2 s?

• 10 m/s

• 15 m/s

• 20 m/s

• 25 m/s

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Three toy cars, each with a mass of 0.050 kg, roll down ramps with different heights. The height of each ramp and the speed of each car at the bottom of each ramp is given in the table. Complete the table by calculating the GPE for each car at the top of the ramp relative to the bottom of the ramp and the KE at the bottom from each car’s motion down the ramp. Round your values to two decimal places. How do the values of GPE and KE you calculated compare? In each case, the GPE at the top of the ramp relative to the bottom of the ramp is equal to the kinetic energy from the car’s motion down the ramp. This demonstrates the law of conservation of energy.

• The GPE is greater than the KE.

• The GPE is less than the KE.

• The GPE is equal to the KE.

• The GPE and KE cannot be compared.

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The diagram shows a person swinging a golf club from point A to point D. The kinetic energy of the golf club would be greatest at which point?

• Point A

• Point B

• Point C

• Point D

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