Physics free-body diagram help?
Tuesday, February 24th, 2009 at
2:01 pm
MRK asked:
A roofer is dragging a 15.0-kg bundle of shingles up the roof using a light rope parallel to the roof. The roof is sloped at an angle of 30.0° with the horizontal.
a.Draw a free-body diagram of the forces involved.
b.What is the force component perpendicular to the roof of the weight of the bundle of shingles?
I drew the diagram, but I really don’t understand what part b is asking me for… Do they want me to state “the perpendicular force”? do they want a value? what do they want??
THANKS!
Tagged with: Free Body Diagram • Physics Help • Roofer
Filed under: Physics
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herts leaking roof
It seems they are asking for the normal force, i.e., the component of the bundle’s weight that is perpendicular to the roof, which is the cosine of the angle of the slope times the bundle’s weight, or
N = cos(30)*15*9.8
N = 127 N