1. Static
2. Sliding
3. Rolling
4. Fluid
Static
- It is friction that acts on something that is not moving
- Eg: A piano is held in place by static friction
- Static friction keeps you in your seat
- No heat or wear is generated
- It is a force resulting when pushing or pulling an object over a surface
- Eg: Pushing a box across the floor
- Heat and wear can result
- Contact is reduced because of rollers or wheels or ball bearings
- Eg: Skate boards have ball bearings in the wheels
- Eg: A cart has wheels
- Less heat and wear will result in comparison with sliding.
- Resistance from a liquid or air
- Eg: Stirring a thick batter
- Eg: Walking through water
- Eg: Olympic bike riders
A smooth surface does demonstrate as much friction as a rough surface.
A lubricant can be used to reduce friction.
Audrey, that's a good description for the different types of friction, and your research has moved the team's understanding forward. To move beyond the cut-and-pasted info, which form of friction are you measuring?
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