Number of Forces Doing Work on Box on Incline

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A box is being pulled up a rough incline, and the discussion centers on identifying the forces acting on it and determining how many of those forces are doing work. Participants agree that there are multiple forces at play, including normal force, friction, and the applied force from the rope. One contributor initially counted four forces but later found that the correct number is three. The emphasis is on understanding the direction of these forces and their role in doing work on the box. Clarifying the forces involved is crucial before concluding which ones contribute to the work done.
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Homework Statement


A box is being pulled up a rough incline by a rope connected to a pulley as shown below. The arrows indicate the direction of motion of the blocks. How many forces are doing work on the box?
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Homework Equations



different forces must be taken into account

The Attempt at a Solution



ok so there's the normal force, force, friction?
 

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msattar07 said:
ok so there's the normal force, force, friction?
First figure out how many forces act on the box. In what direction do they act?

Then figure out which of those forces do work on the box.

Hint: I count 4 forces acting on the box.
 
yea...i guessed that there were four forces because i was looking over another problem in my book that resembled this problem but i don't understand what the forces are..
but then i checked the answer for this problem just now..and the answer is three froces??
 
I advise you to first understand how to identify the forces that act on the box before you worry about which of them are doing work. Start listing them and specify which way they point.
 

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