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Authoritative PPT Summary
"Friction" Motion and Force PPT Courseware 4
1. How is friction generated?
2. What is the direction of friction?
What does the magnitude of friction depend on?
1. When two objects in contact with each other move relative to each other, a force will be generated on the contact surface that hinders the relative movement. This force is called friction.
2. The direction of friction is always opposite to the direction of relative motion of objects.
question:
1. How to change the pressure of the wood block?
Put weights on the block
2. What tool is used to measure friction? How to test?
spring dynamometer
Pulling the block at a constant speed, the pulling force is equal to the friction force
3. What scientific methods are used?
Control Variable
1. Friction: When two objects in contact with each other move relative to each other, a force will be generated on the contact surface that hinders relative movement. This force is called friction (f).
2. Factors affecting the magnitude of sliding friction
Amount of pressure
The roughness of the contact surface
3. Methods to increase friction
Increase the pressure. For example: when braking, increasing pressure is used to increase friction.
Increase the roughness of the contact surface. For example, there are uneven patterns on the soles and tires.
4. Methods to reduce friction
Reduce stress
Reduce the roughness of the contact surface
Use scrolling instead of sliding
Keep the friction surfaces of the two contact surfaces away from each other
Add lubricant
The electromagnetic field separates the contact surfaces
Use air cushion
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