Potential Energy

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 Question 1| 1.61 points  | Save  |
 | You are standing on a scale in an elevator. Suddenly you notice your weight decreases. What do you conclude?| | | | | | | | The elevator is accelerating downwards.|
| | The elevator is moving at a constant velocity downwards.| | | The elevator is moving at a constant velocity upwards.| | | Your diet is working.|
| | The elevator is accelerating upwards.|
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   Question 2| 1.61 points  | Save  |
 | Tidal friction caused by the earth's stretching from the Moon's gravity is gradually slowing down the rotation of the earth.| | | | | | | True|
| False|
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   Question 3| 1.61 points  | Save  |
 | If your mass is 60 kg on Earth, what would your mass be on the Moon?| | | | | | | | 10 kg|
| | 60 lb|
| | 50 kg|
| | 10 lb|
| | 60 kg|
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   Question 4| 1.61 points  | Save  |
 | In which of the following cases would you feel weightless?| | | | | | | | while walking on the Moon|
| | while falling from an airplane with your parachute open| | | while falling from a roof|
| | while traveling through space in an accelerating rocket| | | none of the above|
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   Question 5| 1.61 points  | Save  |
 | Which of the following best describes the origin of ocean tides on Earth?| | | | | | | | The Moon's gravity pulls harder on water than on land, because water is less dense than rock.| | | Tides are caused by the 23 1/2° tilt of the earth's rotational axis to the ecliptic plane.| | | Tides are caused primarily by the gravitational force of the Sun.| | | Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the earth.| | | Tides are caused on the side of the earth nearest the Moon because the Moon's gravity attracts the water.|

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   Question 6| 1.61 points  |...
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