- #1
Prannu
- 17
- 2
If you are twirling a rock around your head with a rope (assuming it is uniform circular motion), then the only acceleration that is acting is radial. So if you take a look at the rock at any given instant, its velocity is perpendicular to its acceleration. My question is, why does the rock not gain any speed as a result of its acceleration? Why do textbooks say that the speed is constant, despite the fact that there is an acceleration (a net force) on the rock?