Friction

Friction is a force that keeps objects that are touching each other from sliding past each other easily.

Which surface could you travel more quickly? snow or ice Tell why. ______________________________________________ ______________________________________________

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Gravity or Friction

1. As the skydiver leaves the plane ________ is the only force acting on her.
2. _________________ causes the hockey puck to stop as it slides along the ice.
3. A boy sits halfway down a hill. _______________ keeps him from sliding down.
4. ______________ causes the apple to fall to the ground.
5. ______________ causes the toy car stops rolling on the carpet.
6. __________________ made this boy fall down on the ice.
7. _______________ is a force between all surfaces - rough or smooth.
8.    The boy is lying on the ground because of ______________.
9. The brakes in a car is an example of _____________________.
10. Spreading oil on a surface would create less _______________.