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Assessment
What is the primary force that keeps planets in orbit around the sun?
Gravity
Electromagnetic force
Friction
Centrifugal force
Which law describes the relationship between the period of a planet’s orbit and its distance from the sun?
Kepler's Third Law
Newton's First Law
Newton's Law of Universal Gravitation
Ohm's Law
What must happen for a planet to remain in a stable orbit around the sun?
The gravitational force must balance its inertia.
The planet must have zero velocity.
The planet must generate its own gravitational force.
The sun must lose mass continually.
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