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Force of Friction

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on
Jul 24, 2020, 6:28:07 PM
Created by
on
Jun 20, 2014, 4:18:45 AM
Ffriction=μstatic⋅Fperpendicular
Frictional Coefficient of Surface
Force Pushing Surfaces Together
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f81b8799-f831-11e3-b7aa-bc764e2038f2

Force of Friction

  The simplest representation of the force of friction relates the coefficient of friction to the force pushing the friction-causing surfaces together, eg. a tire being pushed across a road surface by the weight of a turning car.

The inputs to this equation are the coefficient of friction, μs, and the force, F, pushing the surfaces together.

fs≤μs⋅Fperpendicular

/attachments/f81b8799-f831-11e3-b7aa-bc764e2038f2/ForceofFriction-illustration.png

Notes

In the illustration, we see the back end of a car turning to the left.  The weight of the car due to the force of gravity pushes downward.  That force is equal and opposite to the force of the road pushing up on the car's tires.  The frictional force is toward the direction of the turn keeping the car from sliding outward during the turn.  Hopefully the centripetal force due to the car turning with some radius is less than the Frictional Force, allowing the car to remain on the road.
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