Wednesday, September 19, 2007

The force exerts the brakes to stop the car.




The direction of the force is in the opposite direction that the object moves.

W = F cos 180˚ d


cos 180 ˚ = - 1

W= - F d

The Work Done on the car is negative because of the frictional force.

Frictional Force is always opposing the relative motion of the body.

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