1. Draw and label the direction of the friction force acting on the racing car, which is travelling at constant speed.
2. A small toy car moves along a bench at a slow and constant speed pulled by a mass of 10 g.
i) Draw on the diagram the direction of the friction force acting on the toy car.
Explain the following situations:
I) Both pieces of paper are the same mass. Which piece of paper would hit the ground first? Explain why this is the case.
Crumpled ball of paper falling.
Flat sheet of paper falling
4. A block of wood is being dragged along the motion bench in the laboratory with a force of 20 N. The block’s speed is increasing.
Explain what this tells you about the size of the applied force when comparing it to the frictional force.
ii) Explain what happens to the size of the applied force if the block slows down.
5. Provide examples of three situations where friction is useful. Explain why.
6. Provide examples of three situations where friction can be a hindrance. Explain why it is a hindrance. In each of these situations what can be done to reduce the friction.