Chapter 13, Problem 1A

In Newton’s insight, what did a falling apple have in common with the moon?

To determine

To Explain: In Newton's insight, a falling apple have in common with the moon.

Explanation of Solution

Introduction:

Newton knew that the speed and direction of an object would be changed by applying a force. He saw apple falling in a straight-line path towards earth. But the Moon does not fall, it revolves around in circular orbit around the earth.

Newton knew that circular motion of a Moon around earth was an accelerated motion. For both motions a force is required. He predicted that this force is Earth’s gravitational force.

Conclusion:

Both moon and apple is in motion due to gravitational force of earth.