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jmm5180
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Homework Statement
A 165N sled is pulled a distance of 205m. The task requires 5200J of work to overcome friction and is done by pulling a rope at what angle? Coefficient of friction is 0.25.
Homework Equations
W= Fdcos@ (@ for theta)
F= ma
The Attempt at a Solution
My free body diagram had Force applied in the y direction (Fay) and normal force along the positive y-axis and weight on the negative y axis. Force applied in the x direcrion (Fax) is on the positive x-axis and the force of friction is on the negative y axis.
I tried to solve for a variety of variables, but i can't get the right combination so two unknowns aren't in the same equation. I believe I need to find the force applied before I can get theta.
I solved that Ff = Facos@ (Force applied in the x direction)
For the y direction:
Fasin@ = -N + W
I solved for Fa then..
Fa= (-N+W)/sin@
I plugged that back into Ff= Facos@
Ff= cos@* (-N+W)/sin@
However, normal force is another unknown. I'm not sure where else to go from here.
Thanks in advance.