1. Friction
HANDS OFF THE RAMPS!!!!

2. The Source of Friction Close contact of two objects increases friction
The rougher the surface, the more friction
Every surface has microscopic bumps that create friction
These are sometimes known as hills and valleys

3. What are the types of friction?
Kinetic Friction – when a force is applied to an object, the object moves.
Sliding Friction
Rolling Friction
Fluid Friction
Static Friction - a force is applied to an object, but does not cause the object to move.

4. How Can We Reduce Friction?
We can use a lubricant to reduce friction.
A lubricant makes the surfaces slipperier or smoother, so the object moves more easily.
Wax
Motor oil (or regular oil)
Grease
Water

5. How Can We Increase Friction?
You can increase the force you are putting on an object
You can rub two rough surfaces against each other.
Such as:
using sandpaper
Wearing textured gloves (so a baseball bat doesn’t fly out of your hands)
Using a sponge with a scrubber to fight against food particles on dishes

7. Activity:
Surface
Penny Observations
Car Observations

8. Friction Ramps Copy Paper Laminate (clear plastic) Duct Tape Wax Paper
Sand Paper
Purple Fabric
Crumpled Tin Foil
Cardboard
Carpet
Bubble Wrap
Fuzzy Fabric

9. Activity:
You need a piece of lined paper. Fold the paper into thirds (portrait) and label it as shown: