# Mini-Quiz: Reducing Sliding Friction

by Ron Kurtus (revised 31 October 2016)

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

1. What happens when you apply a lubricant?

The coefficient of friction increases because the lubricant holds back motion

The coefficient of friction decreases due to fluid friction

The coefficient of friction becomes zero

2. How can rollers reduce friction?

The rollers spin at a high speed

No one is really sure, because it is too hard to measure

You are replacing sliding friction with rolling friction

3. What happens when you pull slightly upward on a rope as you slide an object along the floor?

The upward pull reduces the normal force and thus reduces the friction

The upward pull pivots the object against the floor, making it harder to pull

The object will tip over

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.

Work hard and you will succeed

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mini-quiz_friction_sliding_reducing.htm

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