Question

1. Rolling friction is _____than sliding friction.
2. Graphite powder is used in some machines to ____ friction.
3. We want to reduce friction in order to increase ______.
4. To reduce friction between rotating shafts we use ______.​

Answer 1

Answer:

1.lesser2.increase3.force4.ball bearings

Answer 2

1. stronger
2. increase
3. i don't know
4. grease