| Simple | Functions |
 | Reduces effort to overcome a load |
 | Changes the direction of the applied force but not the speed |
 | Changes the speed at which an object moves |
A) X and Y
B) Y and Z
C) Z only
D) Only
Correct Answer: B
Solution :
Figure Y shows gears which change the direction of applied force and also the speed at which an object moves. The smaller gear will turn faster than larger gear. Figure Z shows pulley. It changes the direction of the force but not the speed at which the object moves.
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