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January 26, 2015

January 26, 2015

Posted by **sammeh** on Sunday, November 15, 2009 at 9:27pm.

a 1kg block starts at rest and slides down the incline. the coefficient of friction between the incline and the block is 0.1. The height of the incline is 2m, and the angle is 30 degrees. use energy consideration to find the block's speed at the bottom of the incline. (5.6m/s)

- physics -
**bobpursley**, Sunday, November 15, 2009 at 10:08pmThe friction is the thing to work.

Friction down the plane is .1*mg*cosTheta

Weight down the plane is mgSinTheta

FinalKE=initialPE- forcefriction*distance

Initial PE is mg*2m*sin30

- physics -
**sammeh**, Sunday, November 15, 2009 at 10:27pmhow do you find the distance? is it 2/sin30?

- physics -
**sammeh**, Sunday, November 15, 2009 at 10:37pmI cannot get 5.6m/s

this is what i did.

finalKE = initial PE - Ff*d

(1/2)mv^2 = 9.8 - (.8487 x 4)

v= 3.5

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