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Mini-Quiz: Equivalence Principle of Gravity

by Ron Kurtus (revised 18 February 2010)

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



1. What happens when you increase the mass of an object?

The force of gravity on it increases

The acceleration due to gravity increases

Its weight decreases

2. When does the rule that different masses fall at the same rate fail?

The rule is always true, no matter what

It fails every other time you try it

When an object is noticeably affected by air resistance

3. How could Galileo tell whether the balls hit the ground at the same time, after he dropped them from the Leaning Tower of Pisa?

He used a stopwatch to time them

He had someone standing on the ground below to make the observation

He just guessed that they probably hit the ground at the same time

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.


You can prove things with experiments


Resources and references

Ron Kurtus' Credentials

Websites

Test of Weak Equivalence Principle - Precision Astronomy Group of Harvard-Smithsonian Center for Astrophysics

Feather & Hammer Drop on Moon - YouTube video

Gravity Resources

Books

Top-rated books on Simple Gravity Science

Top-rated books on Advanced Gravity Physics


Questions and comments

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.


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