InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
The figure shows the combination of a movable pulley P1 with a fixed pulley P2 used for lifting up a load W. (a) State the function of the fixed pulley P2 (b) If the free end of the string moves through a distance x, find the distance by which the load W is raised. (c) Calculate the force to be applied at C to just raise the load W = 20kgf, neglecting the weight of the pulley P1 and friction. |
|
Answer» (a) The fixed pulley P2 only changes the direction of the force i.e. force can be applied downwards which is more convenient. (b) The load will be raised by a distance x/2. (c) Distance moved by load dL = x/2 Distance moved by the effort dE = x Load (L) = 20 kgf Effort = ? Load × Load arm = effort × effort arm 20 x x/2 = x x E or E = 10kgf. |
|