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October 20, 2014

October 20, 2014

Posted by **clueless** on Wednesday, November 10, 2010 at 8:25pm.

- ap physics -
**bobpursley**, Wednesday, November 10, 2010 at 8:32pmap?

the block has mgh of PE when it starts, so at the bottom all that energy is kinetic.

Now, friction absorbs this energy, so

mu*mg*distance=mgh

solve for mu

Notice the distance is independent of mass. Neat experiment to show this.

- ap physics -
**Damon**, Wednesday, November 10, 2010 at 8:33pmdistance down = 2.9 sin 30 = 1.45 meter

Ke at bottom = U at top = m g h = m*g*1.45 Joules

Work done by friction = that KE

mu m g * 4.8

so

m*g*1.45 = mu m g *4.8

mu = 1.45/4.8

note m g cancels

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