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fernancb
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Homework Statement
A 15.0 kg block is dragged over a rough, horizontal surface by a 74.9 N force acting at 17.6 degrees above the horizontal. The block is displaced 4.91 m, and the coefficient of kinetic friction is 0.266.
Find the work done by the 74.9 N force = 351 J
Find the work done by the normal force = 0 J
What work does the gravitational force do on the block? = 0 J
This is the part i can't figure out:
How much energy is lost due to friction?
And related to that:
Find the total change in the block's kinetic energy.
Homework Equations
Ff = ((mu)k)(mg)
E = F*d
The Attempt at a Solution
Ef = ((mu)k)(mg) (d)
= 0.266*15*9.8*4.91
= 192 J
What am I doing wrong?