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December 20, 2014

December 20, 2014

Posted by **Rachel** on Thursday, October 16, 2008 at 3:04pm.

F(push)

Weight

Normal

Friction Force

- Physics -
**Damon**, Thursday, October 16, 2008 at 3:16pmF(push) of course decreases

The weight, m g, does not change

Now the normal force against the wall is exactly your push force.

The maximum friction force is mu, the coefficient of friction, times the normal force. Until the book slips, it is equal to mg, the weight. When mu * F decreases to equal the weight, mg, then the book will start to slip.

- Physics -
**Damon**, Thursday, October 16, 2008 at 3:30pmHere is a way to think about this:

Think of the book attached to the wall by a frictional hook.

Until the hook breaks, the hook(friction)holds the book up and the hook (friction) force is exactly equal to the weight because the friction and the weight are the only vertical forces on the book and the book is not accelerating.

However when the normal force decreases so that mu F = mg, the frictional hook breaks and the book slides down.

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