1. Friction
Force and Motion

2. Notes Write down the words in yellow.
The words in white are discussion points, you may write these down, but are not required.

3. Friction
When objects fall to Earth’s surface, gravity is not the only force that acts on them.
Friction is a force that acts between surfaces that touch each other.
Friction slows an objects motion.

4. Friction
When an object is moving, friction pushes it in the opposite direction.
If you push a book across the table, friction between the tabletop and the book slows the book’s motion.

5. Friction The types of surfaces affect the motion of friction.
Friction is greater between rough surfaces than between smooth surfaces.
It is harder to push a box on a rough sidewalk than on a smooth wooden floor.

6. Friction
High Friction Surfaces
carpet
rough sidewalk
grass
gravel

7. Friction Low Friction Surfaces ice hardwood floor linoleum metal
plastic

8. Watch Bill Nye: Friction
Watch Newton’s Apple: The Science of Roller Coasters

9. Exit Ticket How does friction affect the motion of an object?
What types of surfaces have less friction?