Term
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Definition
| A body exerts a force on another body when the first body causes the second force to accelerate. |
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Term
| Compared to the Moon, falling objects have more acceleration on Earth, neglecting drag. A grapefruit has a 1 kg mass. Suppose we take tghis grapefruit to the Moon. The force of gravity on the grapefruit will then be... |
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Definition
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| A certain grapefruit on Earth has a mass of 1 kg and a weight of 1 newton. When the grapefruit is on the Moon its mass is... |
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Definition
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Term
| Suppose we subject a golf ball and a more massive lead ball to identical net forces. Then compared to the golf ball, the lead ball must have.... |
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Definition
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| One third as much net force is exerted on object A as on object B. The two objects have the same mass. How do their accelerations compare? |
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Definition
| Object A has one third as much acceleration as object B |
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Term
| After a brief push, a block of wood slows down as it slides east along a tabletop. As the block slides... |
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Definition
| its acceleration is toward the west |
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Term
| Is any force exerted on you when you slow down while moving along a straight line? |
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Definition
| Yes there is a backward force on you, opposite to your direction of motion |
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Term
| You push your 2 kg physics book along a tabletop, pushing it with 10 N of force. The frictional force on its a 4 newtons. The book acceleration is... |
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Definition
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Term
| Which of the following is part of a force pair with your weight? |
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Definition
| The gravitational force by your body pulling upward on Earth |
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Term
| When you pull an object, such as a table, across the floor, the forward force by you on the table is equal but opposite to the backward force by the table on you. It seems as though these two forces should balance out, so that the table can't be moved. However, the table does move because... |
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Definition
| only one of these two forces actually acts on the table |
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Term
| A rocket taking off straight upward develops 10,000 Newtons of thrust. The rocket weighs 2000 newtons. The net force on the rocket, neglecting air resistance is.... |
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Definition
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Term
| An auto travels down a straight, level road at constant speed. One force that acts on the auto is... |
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Definition
| the normal force of the road pushing upward on the auto |
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Term
| How is the gravitational force between two objects affected by changes in the masses of the objects and by changes in the other objects? |
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Definition
| The force increases with increased mass, and decreases with increased distance |
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Term
| An astronaut's weight is 600 N at the surface of the Earth. How much will she weigh while orbiting in a satellite 12,000 km above the surface? |
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Definition
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Term
| Suppose that the gravitational force by the Earth on the Moon suddenly shut off. How would the Moon then move? |
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Definition
| It would move straight ahead in a straight line, at constant speed |
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Term
| Imagine that you could magically move the Moon closer to Earth, so that the distance from Earth to Moon is cut in half. This would cause the Earth exerts on the Moon to be... |
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Definition
| increased to four times its original value |
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Term
| Suppose we could magically triple the distance between Earth and the Moon. This would cause the gravitational force by Earth on the Moon to be.... |
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Definition
| reduced to 1/9 of its former value |
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Term
| When you are in a high flying jet plane, does either your weight of your mass differ from their normal value as measured on the ground? |
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Definition
| your weight is slightly reduced, but your mass is unchanged |
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Term
| Wood is less dense than iron. Does Earth's gravity pull more strongly on a block of wood or on a block or iron having the same size? Negative resistance, which one falls faster when dropped? |
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Definition
| Gravity pulls more strongly on the iron, and both fall at the same speed |
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Term
| If gold were always sold by weight, could you make money buying gold at one altitude above the ground and selling it a different altitude? |
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Definition
| Yes, you could make money by buying gold at a higher altitude and selling it at a lower altitude |
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