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Mini-Quiz: Law of Universal Gravitation

by Ron Kurtus

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

1. Did Isaac Newton discover gravity?

Yes, he made the discovery after keen observations

Most people think he invented gravity, because it didn't exist before him

No, Newton elaborated on previous work of other scientists

2. Why would the orbit of Mars be affected by the Earth?

Gravitation from the Earth can distort the orbit of Mars at certain positions

Mars will sometimes rotate around the Earth

The planets are too far apart to have any influence

3. Are light rays deflected by the Earth's gravitation?

No, because light has no weight

Yes, although the deflection would be extremely small

It depends on the speed of the light rays

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.

Learn why things happen

Resources and references

Ron Kurtus' Credentials


Scientific Hypothesis, Theory, Law Definitions: Learn the Language of Science - Anne Marie Helmenstine, Ph.D.,

Understanding General Relativity - Rafi Moor, Israel

Einstein's Theory of General Relativity - Andrew Zimmerman Jones,

General Relativity - Wikipedia

The Meaning of Einstein's Equation - John C. Baez, University of California-Riverside and Emory F. Bunn, University of Richmond (Virginia)

The Einstein Field Equations - Larry Smarr, University of Illinois

Gravitation Resources


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Mini-Quiz: Law of Universal Gravitation

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