Gravity and Motion Answers

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Which force helps keep Earth in orbit?

A
Earth’s gravity
B
the moon’s inertia
C
the Sun’s gravity
D
the Sun’s inertia
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In a far-off galaxy, an astronomer observes a moon orbiting a planet. The moon stays in orbit because of the planet’s gravity.Which scenario would increase the gravity of the planet?

A
decreasing the distance between the moon and the planet
B
increasing the distance between the moon and planet
C
increasing the planet’s inertia
D
increasing the moon’s inertia
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The planets Hox and Blox are near each other in the Dorgon system. The Dorgons have very advanced technology, and a Dorgon scientist wants to increase the pull of gravity between the two planets.Which proposals would the scientist make to accomplish this goal? Check all that apply.

A
decreasing the distance between Hox and Blox
B
increasing the mass of Hox
C
increasing the distance between Hox and Blox
D
decreasing the mass of Blox
E
increasing the mass of Blox
F
decreasing the mass of Hox and Blox
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Fredo’s spaceship takes him to the very edge of known space. There, gravity has no effect at all. Fredo takes a baseball and tosses it into space. What will most likely happen to the ball?

A
It will not move at all.
B
It will return to Fredo’s spaceship.
C
It will eventually stop moving.
D
It will continue moving in a straight line.

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