# Mini-Quiz: Direction Convention for Gravitational Motion

by Ron Kurtus (revised 15 May 2011)

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

1. Why are the direction conventions for gravity and gravitation equations similar?

It is a strange coincidence

Gravity is an approximation of gravitation

They are only similar when the masses of the objects are the same

2. Why is the larger object used as a frame-of-reference?

Because the larger object has no center of mass

Smaller objects move faster than larger objects

You usually consider small objects orbiting larger objects

3. When is a velocity in a negative direction?

When the velocity is moving toward the larger object

When the velocity is in a circle

When the velocity is moving away from the larger object

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.

## Resources and references

Ron Kurtus' Credentials

### Websites

Gravitation Resources

### Books

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.

## Students and researchers

www.school-for-champions.com/science/
mini-quiz_gravitation_direction_convention.htm

## Where are you now?

School for Champions

Gravitation topics

## Gravity

### Let's make the world a better place

Be the best that you can be.

Use your knowledge and skills to help others succeed.

Don't be wasteful; protect our environment.

#### You CAN influence the world.

The School for Champions helps you become the type of person who can be called a Champion.