# Mini-Quiz: Normal Force in Sliding Friction

by Ron Kurtus (16 September 2016)

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

1. When is the normal force equal to the weight of an object?

When the object is on a level plane

It is actually equal to the mass of the object

It depends on the direction of motion

2. As the angle of an incline increases, what happens to the normal force, as affected by gravity?

It increases until it gets to infinity

Nothing, because normal force has nothing to do with the incline

It decreases until it reaches zero at a vertical incline

3. What is an example of creating an external normal force?

Increasing the incline of the plane

Pushing the two objects together

Changing the coefficient of friction

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 are on your way to the top

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