Work & Friction: Calculating Magnitude

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To calculate the magnitude of the work done by the force of friction on the block, first determine the normal force, which accounts for the angle of the applied force. The frictional force can be calculated using the coefficient of kinetic friction multiplied by the normal force. Once the frictional force is known, apply the work formula, W = F * D, using the frictional force as F and the displacement as D. The work done by friction will be negative since it opposes the direction of motion. Clear steps and calculations are essential for arriving at the correct answer.
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Homework Statement



An 18.5 kg block is dragged over a rough,
horizontal surface by a constant force of 129 N
acting at an angle of angle 29.3◦ above the
horizontal. The block is displaced 64.8 m,
and the coefficient of kinetic friction is 0.115. The
acceleration of gravity is 9.8 m/s2 .

How can I figure out the magnitude of the work done by the force of friction!


Homework Equations



W = F*D

The Attempt at a Solution


I attempted to do -129 times the displacement but, its not correct :(
 
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