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Ib Physics IA Tutor Help Topics Solid Friction

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Solid friction

Friction is a non conservative force which opposes motion. If there is no motion, then there will be no force caused by friction.

For two solid surfaces moving over each other, the friction will be affected by the nature (roughness etc) of the two surfaces. However, the surface area and velocity of the object does not affect the friction.

There are also two types of friction for solid surfaces: static friction and kinetic friction. Static friction is that which stops objects from beginning to move. Kinetic friction is that which slows objects down when they are moving. Static friction is always larger than kinetic friction.

These two types of friction are defined individually by their constants µs and µk respectively.

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