What makes it roll?
Think about the question below. Only one of the answers listed is correct. We'll do some (but probably not all) of these questions in the lectures when you will all be asked to vote on which answer you think is correct. (Soon afterwards, you'll be able to see your responses, and those of the whole class at EVAF.)
A uniform cylinder is placed
at the top of a slope and released. What is the force that causes it to roll down the hill?
1 | The normal contact force |
2 | The component of its weight acting down the slope |
3 | The frictional force acting up the slope |