Bell Work: Friction Details

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Presentation transcript:

Bell Work: Friction Details To increase friction, ( increase / decrease ) an objects weight. To increase friction, make the surface ( rougher / smoother ). ______ forces cause acceleration. If the net force is zero, you are moving at a ( constant / changing ) speed. What are the units for friction?

Coefficient of Friction Tells how strong the friction force is Depends on two things: Weight of object Surface conditions (rough or smooth) Ratio of friction to normal force Symbol: μ (mu) Has no units

Static Friction Friction when an object is stationary Higher than kinetic because you have to accelerate to overcome it. Acceleration requires a net force.

Kinetic Friction Friction when an object is moving Lower than static friction because you do not need to accelerate. No acceleration means no net force.