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# Types of Friction

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## Alisha Jarvis

on 4 March 2014

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#### Transcript of Types of Friction

Types of Friction
Static Friction
According to Newton's second law, if the acceleration is zero (the object isn't moving), then the net force applied is zero.

The force that can cancel your push when you are trying to move an object is static friction.
Sliding Friction
Sliding friction is the force that opposes the motion of two surfaces sliding past each other.

This is caused by microwelds constantly breaking and then forming again as the box slides along the floor. To keep a box moving, you must continually apply force.
Rolling Friction
The friction between a rolling object and the surface it rolls on is rolling friction.

Rolling friction is due partly to the microwelds between two surfaces. Rolling friction is usually much less than static friction or sliding friction.
Air Resistance
Whenever you drop something, air resistance acts on it. The amount of air resistance on an object depends on the speed, size, and shape of the object.

Air resistance, not the amount of mass in the object, is why feathers fall more slowly than apples.
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