Unit 3: Energy, Force and Motion Review

Harry uses a pulley to put up a bucket of water from a well. Which of the following energy transformations also occurs as the bucket rises from the bottom of the well?

• a.     Energy is gained as potential energy is transformed to kinetic energy.

• b.     Energy is gained as kinetic energy is transformed to potential energy.

• c.      Energy is conserved as potential energy is transformed to kinetic energy.

• d.     Energy is conserved as kinetic energy is transformed to potential energy.

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The diagram above depicts a vehicle on its journey throughout the day.  As the car moves from point A, to point B, and finally to point C, which of the following shows how the total energy of the car changes throughout the day?

• a.    The energy decreases from point A to point B, then increases from point B to point C

• b.    The energy increases from point A to point B, then decreases from point B to point C

• c.    The energy stays the same, but is converted between potential and kinetic energy

• d.    The energy is lost between points B and C and then lost between points A and B

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Refer to the diagram of a roller coaster to help you answer this question.

Ryan and his family are visiting a theme park and he wants to ride a roller coaster. At which point in the diagram would he expect to have the greatest amount of potential energy?

• a)     Point W

• b)     Point X

• c)      Point Y

• d)     Point Z

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Pam rubs a balloon on her head and then holds the balloon up against a wall. Why might the balloon stick to the wall?

• a. Friction prevents the balloon from sliding down the wall.

• b. A chemical reaction causes the balloon to stick to the wall.

• c. Electric force causes particles in the balloon and the wall to attract.

• d. Magnetism causes an attractive force between the balloon and the wall.

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When a pendulum swings, at which point is potential energy at its greatest?

• 1
• 2
• 3
• 4

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A group of people rented a fishing boat for the day and traveled far from land. Later they discovered they needed a compass to find their way back. Which of the following describes the force acting on the compass to guide them safely back to land?

• A. Gravity

• B. Electrical Force

• C. Magnetic Force

• D.  Friction

In 1969, Neil Armstrong became the first person to walk on the Moon. Video coverage showing the astronaut walking on the surface of the Moon gives the impression that he was bouncing while he walked. What is the reason for this?

• 1. A The astronaut's mass on the Moon decreases.

• 1. B. The density of the astronaut on the Moon is higher than on Earth.

  2. force.

• 1. C. The atmosphere of the Moon affects the way the astronaut is able to move.

• 1. D. The astronaut's weight on the Moon depends on the Moon's gravitational

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According to the Law of Universal Gravitation, which satellite would experience the least amount of gravitational attraction to the Earth?

 

• A.   Satellite A

• B.    Satellite B

• C.    Satellite C

• D.   Satellite D

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• A

• B

• C

• D

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• A

• B

• C

• D

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