Friction (Grade 9)
Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.
- potential energy.
- thermal energy.
- mechanical energy.
- electrical energy.
- A bicycle rolling down a hill
- A baseball player sliding into 2nd base
- A diver falling through the air to a pool
- All of the above experience some friction.
At which point did the rock have the strongest friction?
- when it was sitting still
- when Morgan was pushing it
- when it was falling through the air
- when it was rolling on the conveyor belt
- speed and light
- how fast the objects are going and on what planet
- how big the objects are and how hard you push them
- how hard the surfaces push together and the types of surfaces involved
- To decrease friction so you move faster
- To increase friction so you can change your motion more easily
- To decrease your mass so you have more momentum
- To reduce gravity and make you lighter
- 55 N
- 45 N
- 50 N
- 10 N
- Because wheels reduce the pull of gravity
- Because rolling friction is weaker than sliding friction, so you lose less work
- Because wheels increase the normal force on a box.
- None of the above