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20 Cards in this Set
- Front
- Back
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1.
What is the force of gravity on a 500-N woman standing on Earth's surface? Possible Answers A. 50 N B. 250 N C. 500 N D. 509.8 N E. none of these |
C. 500 N
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2.
Inside a freely falling elevator, there would be no Possible Answers A. gravitational force on you. B. apparent weight for you. C. both gravitational force on you and apparent weight for you D. none of these |
B. Apparent weight for you
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3.
Consider two planets in space that gravitationally attract each other. If the masses of both planets is doubled, and the distance between them is also doubled, then the force between them is Possible Answers A. one-quarter. B. half as much. C. twice as much. D. four times as much. E. none of these |
E. None of these
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4.
An object is placed exactly halfway between Earth and the Moon. The object will fall toward the Possible Answers A. Earth. B. Moon. C. neither Earth nor Moon |
A. Earth
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5.
A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater? Possible Answers A. the force on A B. the force on B C. both forces are the same. |
C. Both Forces are the same
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6.
Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each Possible Answers A. increases. B. decreases. C. remains constant. |
A. Increases
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7.
Inside a freely falling runaway elevator, your Possible Answers A. acceleration is zero. B. apparent weight is zero. C. gravitational interaction with the earth is zero. D. all of these E. none of these |
B. Apparent weight is zero
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8.
Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are Possible Answers A. beyond the main pull of Earth's gravity. B. above Earth's atmosphere. C. without support forces. D. all of these E. none of these |
C. Without support forces
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9.
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity Possible Answers A. increases. B. remains unchanged. C. decreases. |
C. Decreases
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10.
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its horizontal component of velocity Possible Answers A. increases. B. remains unchanged. C. decreases. |
B. Remains Unchanged
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11. A stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the cliff is
Possible Answers A. 5 m. B. 10 m. C. 15 m. |
A.
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12.
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of motion Possible Answers A. decreases. B. remains constant. C. increases. |
B
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13.
A bullet fired from a rifle begins to fall Possible Answers A. as soon as it leaves the barrel. B. after air friction reduces its speed. C. neither as soon as it leaves the barrel nor after air friction reduces its speed |
A.
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14.A projectile is launched vertically at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is
Possible Answers A. less than 50 m/s. B. 50 m/s. C. more than 50 m/s. |
B.
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15. A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of speed because it
Possible Answers A. is not acted on by any forces. B. is not acted on by any horizontal forces. C. has no vertical component of speed to begin with. D. the net force acting on it is zero. E. none of these |
B
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16.A ball is thrown upward and caught when it comes back down. Neglecting air resistance, the speed with which it is caught is
Possible Answers A. more than the speed it had when thrown upward. B. less than the speed it had when thrown upward. C. the same as the speed it had when thrown upward. |
C
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17.
If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about Possible Answers A. 1 s. B. 2 s. C. 10 s. D. not enough information given |
A
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18.
Without air resistance, a projectile fired horizontally at 8 km/s from atop a mountain will Possible Answers A. accelerate downward at g as it moves horizontally. B. trace a curve that matches Earth's curvature. C. return later to its starting position and repeat its falling behavior. D. all of these E. none of these |
D
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19.earth satellites are typically more than 100 km high so as to be above Earth's
Possible Answers A. atmosphere. B. gravitational field. C. both atmosphere and gravitational field |
A
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20.A satellite in an elliptical orbit travels at constant
Possible Answers A. velocity. B. speed. C. acceleration. D. all of these E. none of these |
B
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