Question

Friction between two surfaces may be reduced by all of the following methods EXCEPT:

• A. Separating the two surfaces with a cushion of air.
• B. Pushing the two surfaces together with a greater force.
• C. Putting liquid such as oil between the surfaces.
• D. Using ball bearings between the two surfaces changing sliding motion to rolling motion

Answer 1

The correct option is B

Pushing the two surfaces together with a greater force.

Pushing the two surfaces together with a greater force increases friction.