8. [1pt] A block of weight 35.0 N sits on an inclined plane, which makes anangle

Question

8. [1pt]
A block of weight 35.0 N sits on an inclined plane, which makes anangle of 30.0° with the horizontal, as shown. The coefficientof kinetic friction between the block and the inclined plane is0.340. A force applied parallel to the incline is just sufficientto pull the block up the plane at constant speed. What is the totalwork done on the block by all forces as the block moves a distanceL = 2.01 m up the incline? Include only thework done after the block has started moving at constant speed, notthe work needed to start the block moving from rest.
9. [1pt]
What is the work done by gravity?
10. [1pt]
What is the work done by the applied force?
11. [1pt]
What is the work done by the normal force?

Explanation / Answer

weight W = 35 N angle = 30 degrees The coefficient of kinetic friction between the block and theinclined plane is = 0.340 distance L = 2.01 m (a). work done by gravity w= - W sin * L                                          = - 35.175 J (b). Work done by applied force w ' = F *L   Since it moves with constant speed ,applied frce = frciotnalforce + W sin                                                                     F = W cos + W sin                                                                        = 27.8 N        So, w ' = 55.878 J (c). work done by normal force w " = 0 Since normal force and displacement are perpendicular toeach other

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