previous | 4 of 9 I n 59 Pulling a Block on an Incline with Friction Part A A bl
ID: 1774118 • Letter: P
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previous | 4 of 9 I n 59 Pulling a Block on an Incline with Friction Part A A block of weight mg sits on an inclined plane as shown in (Eigure 1). A force of magnitude F1 is applied to pull the block up the incline at constant speed. The coefficient of kinetic friction between the plane and the block is What is the total work Wrike done on the block by the force of friction as the block moves a distance L up the incline? Express the work done by friction in terms of any or all of the variables m, g, e, and F1 Hints Submit My Answers Give Up Part B What is the total work WE, done on the block by the applied force Fi as the block moves a distance L up the incline? Express your answer in terms of any or all of the variables m, g, L, and F. Figure 1 012 Submit My Answers Sive Up Now the applied force is changed to Fa. so that instead of pulling the block up the incline, the force pulls the block down the incline at a constant speed as shown in (Figure 2) ys Part c son AExplanation / Answer
(a) workdone by the frictional force
Wfric = Ffric * L
= - mg cos * L
= - m g L cos
(b) Workdone by total force F is
WF = F * L
= (mg sin + mg cos ) * L
= m g L ( sin + cos )
(c)workdone by the frictional force
Wfric = Ffric * L
= - mg cos * L
= - m g L cos
(d) Workdone by total force F is
WF = F * L
= (mg cos - mg sin ) * L
= m g L ( cos - sin )
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