Question

Device to change sliding friction into rolling friction _________

Answer 1

1. Due to the fact that rolling friction is less than sliding friction, sliding is typically replaced with rolling in most machines through the use of ball bearings to reduce friction.
2. Ceiling fans and bicycles, for example, use ball bearings between their hubs and axles, which is a common application.

Hence, the device to change sliding friction into rolling friction is ball bearing.