Static and Kinetic Friction

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Presentation transcript:

Static and Kinetic Friction

The force of friction depends on two things, what are they? The force pressing the surfaces together (normal force - FN) The type of surfaces in contact (coefficient of friction – μ)

What direction does friction always act? Opposite the direction of motion or opposite the direction an object would tend to move.

Static Friction The Force of Static Friction keeps a stationary object at rest! FN F fs Fg

Kinetic Friction Once the Force of Static Friction is overcome, the Force of Kinetic Friction is what offers resistance to a moving object! Motion FN F fk Fg