Homework Help: physics

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

need help with this question please

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 10:08pm
The 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 10:27pm
how do you find the distance? is it 2/sin30?
physics - sammeh, Sunday, November 15, 2009 at 10:37pm
I 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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