Practice Problems
Gravitational Fields and Forces
Directions:
On this worksheet you will examine the properties of gravitational forces and fields.
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Question 1
Two masses, 3 kg and 6 kg, initially at rest, are both released and fall freely to the ground. Which mass would experience the greater acceleration while falling?
6 kg
both masses experience the same acceleration
3 kg
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Question 2
When initially released, which mass experienced the greater gravitational force of attraction to the earth?
3 kg
both masses experience the same gravitational force of attraction
6 kg
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Question 3
When initially released, which mass weighed more in the earth's gravitational field?
6 kg
both masses weighed the same
3 kg
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Question 4
If when both masses impact the earth their centers land 2.646 meters apart, what is the gravitational force exerted on the small mass by the larger mass?
8.57 x 10
^{-11}
N
1.91 x 10
^{-11}
N
2.86 x 10
^{-11}
N
1.71 x 10
^{-10}
N
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Question 5
On the surface of Planet X a 42-kg mass weighs 823.2 N. What is the local value of Planet X's gravitational field strength?
84.0 N/kg
19.6 N/kg
9.8 N/kg
0.051 N/kg
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Question 6
If Planet X has the same radius as the Earth, what is the mass of Planet X? If needed, the mass of the Earth is 5.98 x 10
^{24}
kg.
1.15 x 10
^{27}
kg
1.2 x 10
^{25}
kg
2.99 x 10
^{24}
kg
1.17 x 10
^{26}
kg
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Question 7
If the 42-kg mass is moved to a position which is 6.3 radii above the surface of Planet X, how will its weight be affected?
its weight will be decreased by a factor of 10 / 63
its weight will be decreased by a factor of 100 / 3969
its weight will be increased by a factor of 3969 / 100
its weight will be increased by a factor of 63 / 10
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Question 8
When released from rest an object in freefall and tracked by a motion detector, which of the following position-time graphs will be displayed?
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Question 9
When released from rest an object in freefall and tracked by a motion detector, which of the following velocity-time graphs will be displayed?
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