Question

Rolling rock down the hill is an example for ......................... Fill in the blank

Answer 1

I think... ROLLING FRICTION is your answer, since you have not specified from which you are asking.

Answer 2

Rolling rock down the hill is an example for gravitational pull.

Gravitational wave is the invisible ripple in the space.

All the objects regardless of living beings or the celestial bodies are easily subject to the gravitational pull.

In fact, distant stars are exerting for attraction on the earth and many number of example.