The block moves up an incline with constant speed. what is the total work wtotal done on the block by all forces as the block moves a distance l = 3.60 m up the incline? include only the work done after the block has started moving at constant speed, not the work needed to start the block moving from rest.

Question

Physics

Kenya Sims

9 September, 16:13

The block moves up an incline with constant speed. what is the total work wtotal done on the block by all forces as the block moves a distance l = 3.60 m up the incline? include only the work done after the block has started moving at constant speed, not the work needed to start the block moving from rest.

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Raiden · Answer 1

I found a similar problem from another website which shows the diagram. This is because we need to compute first the net force to determine the work. Afterwhich, we can use the formula: Work = Force*Distance.

Net Force = 12.2 N - wcosθ

Since the weight is 30 N and the angle is 24°,

Net Force = 12.2 - 30cos24° = - 15.2 N

So,

W = (-15.2 N) (3.60 m)

W = - 54.7 J