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 7 kg, initially at rest, are both released and fall freely to the ground. Which mass would experience the greater acceleration while falling?
3 kg
both masses experience the same acceleration
7 kg
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Question 2
When initially released, which mass experienced the greater gravitational force of attraction to the earth?
7 kg
both masses experience the same gravitational force of attraction
3 kg
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Question 3
When initially released, which mass weighed more in the earth's gravitational field?
3 kg
both masses weighed the same
7 kg
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Question 4
If when both masses impact the earth their centers land 2.193 meters apart, what is the gravitational force exerted on the small mass by the larger mass?
5.55 x 10
^{-11}
N
1.39 x 10
^{-10}
N
2.91 x 10
^{-10}
N
3.24 x 10
^{-11}
N
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Question 5
On the surface of Planet X a 43-kg mass weighs 983.3 N. What is the local value of Planet X's gravitational field strength?
22.9 N/kg
100.3 N/kg
13.1 N/kg
0.044 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.
1.4 x 10
^{25}
kg
1.34 x 10
^{27}
kg
2.56 x 10
^{24}
kg
1.37 x 10
^{26}
kg
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Question 7
If the 43-kg mass is moved to a position which is 5.1 radii above the surface of Planet X, how will its weight be affected?
its weight will be increased by a factor of 2601 / 100
its weight will be increased by a factor of 51 / 10
its weight will be decreased by a factor of 100 / 2601
its weight will be decreased by a factor of 10 / 51
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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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