Question

Explain how forces affect the motion of the planets

Answer 1

The Two Forces That Keep the Planets in Motion Around the Sun

Gravity. Gravity is the primary force that controls the orbit of the planets around the sun.

Inertia. The physical law that states that objects in motion have a tendency to remain in motion.

Gravity Working with Inertia.

Step-by-step explanation:

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Answer 2

Any moving object in space will travel in a straight line at the same speed forever, planets included. The planets would be moving in straight lines, but the sun's gravity pulls them toward it. The force of gravity causes the moving planets to travel in roughly circular orbits around the sun.