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Questions and Answers

What provides the centripetal force for the moon's motion around the earth?

Force of repulsion of the earth

Force of attraction of the sun

Force of attraction of the earth (correct)

Force of attraction of the moon

Why does the earth not move towards an apple when the apple falls towards the earth?

The apple's gravitational force is not strong enough to move the earth

The earth is stationary

The earth's gravitational force only acts on smaller objects

The mass of the earth is much larger than the mass of the apple (correct)

Why do we not see the earth moving towards the moon?

The moon's gravitational force is not strong enough to move the earth

The mass of the earth is much larger than the mass of the moon (correct)

The earth's gravitational force only acts on smaller objects

The earth is too far from the moon

What did Newton conclude from the motion of the planets around the Sun?

<p>There exists a force between the Sun and the planets</p> Signup and view all the answers

According to the third law of motion, does the apple attract the earth?

<p>Yes, the apple does attract the earth</p> Signup and view all the answers

Study Notes

Gravity and Motion

The centripetal force for the moon's motion around the earth is provided by the gravitational force between the earth and the moon.
The earth does not move towards an apple when it falls because the mass of the earth is enormous compared to the mass of the apple, resulting in an imperceptible acceleration of the earth towards the apple.
We do not see the earth moving towards the moon because the moon's mass is relatively small compared to the earth's, resulting in an acceleration of the earth towards the moon that is too small to be noticeable.

Newton's Conclusions

From the motion of the planets around the Sun, Newton concluded that the force of gravity is a universal force that acts between all objects with mass.
According to the third law of motion, the apple attracts the earth with the same force that the earth attracts the apple, demonstrating the mutual nature of gravitational force.

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Description

Test your knowledge of geography, art, and astronomy with this fun quiz! Answer questions like, "What is the capital of France?" and "Who painted the Mona Lisa?" Challenge yourself and see how much you really know about the world around you.