Friction A Force That Opposes Motion Chapter 1

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

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

We’re now going to watch a short clip on frictional forces

Frictional Forces pages 14 & 15

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

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

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

Static and Kinetic Friction pages 16 & 17

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!

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

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

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

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!

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

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