In a pulley, is work being done if the force exerted is in the opposite direction of the motion?

Answer 1

If we are moving something with a pulley, we are doing positive work on that object (as it is speeding up). The force on the object is due to the tension in the rope, which pulls the object in that direction. By the virtue of the pulley, one of its uses is just this, to change the direction of an applied force. This force of tension IS IN THE DIRECTION OF THE MOTION and direction of the actual body doing the pulling is irrelevant.

Answer 2

For type a million you all began real via breaking the rigidity into x and y. You made the blunders questioning the Fn is altered via the rigidity (that's no longer). Fn = Fgy (tension of gravity interior the Y path). The tension of rigidity is a mix of the two x & y guidelines going up the incline. extraordinarily plenty to sparkling up it you separate each and every of the forces into the x and y guidelines (Fn and Friction). then you certainly examine out Ftx - Fgx - Ffx = ma (Ffx tension of friction in x path). Do the comparable for the y path to locate Fty after which you ft^2 = Ftx^2 + Fty^2. type 2b you had real. because of the fact the helium replaced into putting rigidity up and the load replaced into putting rigidity down. considering there replaced into no flow the rigidity up equals the rigidity down, consequently the internet rigidity on the rope is comparable to 0. i think of it relatively is right, optimistically it helped.

Answer 3

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