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Mini-Quiz: Gravitational Force Between Two Objects

by Ron Kurtus (revised 15 September)

Take this Mini-Quiz to check your understanding of the lesson material.



1. Why is an average separation between the Earth and the Moon used?

It is difficult to measure the exact separation since the Moon is moving so fast

The Moon's orbit around the Earth is more of an ellipse, so an average must be used

Measuring devices are not accurate

2. What is one result of the great force between the Earth and the Moon?

Oceans are pulled toward the Moon

There is no gravitation on the Moon

Items often will just fly into space

3. Why won't most objects move together because of their gravitational forces?

They actually repel each other

No one is sure of the reason

The force of attraction is quite small

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.


Assert yourself


Resources and references

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Acceleration due to Gravity Calculations - from Western Washington University

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Top-rated books on Gravity

Top-rated books on Gravitation


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