# Mini-Quiz: Horizontal Motion Unaffected by Gravity

by Ron Kurtus (revised 14 February 2011)

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

1. What happens when an object is projected perpendicular to gravity?

It continually moves parallel to the ground

Its horizontal velocity remains the same, but it falls according to gravity

It slows down

2. Is the horizontal velocity constant when an object is projected at a downward angle?

Yes, the horizontal component of the velocity remains constant

It depends on the angle

No, the horizontal velocity accelerates

3. If the Earth is a sphere, how can it be considered flat?

Many people still believe the Earth is flat

The Earth is not an exact sphere but is flat on one side

Since the Earth is so large, its surface is approximately flat for short displacements

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.

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## Resources and references

Ron Kurtus' Credentials

### Websites

Independence of Perpendicular Components of Motion - PhysicsClassroon.com

Gravity Resources

### Books

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

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