What is friction?

Friction is a contact force. It can make an object stay still, or oppose the motion of a moving object.

The problem of friction:

1. Slow down the motion and waste the energy
2. Cause wear

Way to Reduce friction:

1. Air Cushion
2. Use lubricant (WD40 / soapy water / oil (liquid form)/ grease (solid form))
3. Changing sliding motion to rolling motion
4. Stream lized shape

* Reduce contact surface area between object can reduce friction.

Making use of friction:

1. Prevent slipping or skidding
2. Hold an object in position
3. Slow down a moving object
4. Move objects
5. Produce heat (kinetic energy --> heat energy + sound energy)

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