1. Friction: A Force That Opposes Motion
Chapter 1 Section 3 (pages 14-19)

2. Friction p. 14 A force that opposes motion
between two surfaces that are
in contact

3. We’re now going to watch a short clipon
frictional forces

4. Frictional Forces pages 14 & 15

5. When the hills and valleys of one surface stick to the hills
and valleys of another surface,
friction is created. P. 14

6. Amount of Friction Two or more factors p. 14 1 Roughness of
the surface 2
The amount of
force pushing the
surfaces together.

7. Static Kinetic Two Types of Friction pages 16-17
Friction between moving surfaces
Too heavy, can’t move!
This would be at a 0 Net force.
When a force is applied to an object,
but the object does not move.

8. Static and Kinetic Friction pages 16 & 17

9. Friction Harmful and Helpful p. 17
Less frictional forces in this situation
could spell disaster
You’ve got to have friction around these
corners or your in major trouble!

10. Look at the picture and tell how friction has been decrease
Look at the picture and tell how friction has been decrease. Write another example for each.

11. Lubricant (s) p. 18 Substances applied to surfaces
to reduce the friction between the surfaces.
One way to reduce
friction!
Lubricant (s) p. 18

12. Rolling Kinetic Friction p. 18
Another way to
reduce friction!
Rolling Kinetic Friction p. 18

13. Smooth surface reduces
Reducing Friction Again!! P. 18
Rough wood is uncomfortable
because of increased friction
between you and the wood.
Smooth surface reduces
friction and is more
comfortable to use!

14. Increasing Friction p. 19 One way is to make the surfaces rougher!
Applying or increasing pressure
One way is to make the
surfaces rougher!

15. While watching the video clip, consider how the wheel material enhances the drivers ability to drift.
Don’t do this at home!!!
Trike Drifting 1:44