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Circular Motion Calculation Review
1. Suppose that two objects attract each other with a gravitational force of 16 Newtons. If the
distance between the two objects is doubled, what is the new force of attraction between the
two objects?
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2. Suppose that two objects attract each other with a gravitational force of 16 Newtons. If the
distance between the two objects is reduced in half, then what is the new force of attraction
between the two objects?
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3. Suppose that two objects attract each other with a gravitational force of 16 Newtons. If the
mass of both objects was doubled, and if the distance between the objects remained the same,
then what would be the new force of attraction between the two objects?
4. Suppose that two objects attract each other with a gravitational force of 16 Newtons. If the
mass of both objects was doubled, and if the distance between the objects was doubled, then
what would be the new force of attraction between the two objects?
5. Suppose that two objects attract each other with a gravitational force of 16 Newtons. If the
mass of both objects was tripled, and if the distance between the objects was doubled, then
what would be the new force of attraction between the two objects?
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6. A 3-kg rock swings in a circle rock swings in'a circle of radius of radius 5 m. If its constant
speed is 8 m/s, what is the centripetal acceleration?, what Ls_Iha_c.eotripetal acceleration?
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7. A skater moves with a speed of 15 m/s in a circle of radius circle of radius 30 m. The ice exerts
a centripetal force of 450 N. What is the mass of the skater?
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8. The wall exerts a 600 N force on an 80-kg person moving at 4 m/s on a circular platform.
What is the radius of the circular path?
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9. The mass of two balls is 0.80 kg each and they are separated by a distance of 0.25 meters.
Calculate the gravitational force between the two balls.
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10. Mars has a mass of 6.4 x 1023 kg and its moon Phobos has a mass of 9.6 x 10is kg. The
magnitude of the gravitational force between the two bodies is 4.6 x 10is N. Calculate the radius
of the orbit between Mars and Phobos.
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