Question

In the decreasing order of magnitude, which of the following is correct?
a. Rolling < static < sliding friction.
b. Static > sliding > rolling friction.
c. Static > rolling > sliding friction.
d. Sliding < static < rolling friction.

Answer 1

Answer:

b. Static > sliding > rolling friction.

Explanation:

Static friction is greater than sliding friction.  It takes more force to get an object to start sliding than to keep it sliding.

Sliding friction is greater than rolling friction.  There are fewer points of contact for a round surface compared to a flat one.