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zstraught

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- Homework Statement
- A 2.4*10^2 N force is pulling an 85 kg refrigerator across a horizontal surface. the force acts at an angle of 20.0 above the surface. the coefficient of kinetic friction is .200, and the refrigerator moves a distance of 8.00 m. find (a) the work is done by the pulling force, and (b) the work is done by the kinetic frictional force

- Relevant Equations
- W=Fd

I drew a force diagram, Normal force up, weight down, force of friction to the left, and Force applied 20 degrees above the positive x axis.

I need clarification to find the force of Friction for part B. Should I set Force of friction equal to mu · normal force or should I use Newton's second law and set the force of friction equal to Fa·cos(20)? They both look like valid choices, but they both give different values of force of friction.

I need clarification to find the force of Friction for part B. Should I set Force of friction equal to mu · normal force or should I use Newton's second law and set the force of friction equal to Fa·cos(20)? They both look like valid choices, but they both give different values of force of friction.