Pulleys are used to

Pulleys are used to

• A. Change the direction of the applied force
• B. Increase the amount of force required
• C. Convert AC to DC
• D. Measure voltage

Answer: (A)

Pulleys are used to redirect the force you apply, letting you pull in a more convenient direction to lift or move a load. A fixed pulley simply changes where the rope goes, so you can pull downward to lift upward without increasing the effort due to direction alone. In more complex pulley systems you can gain mechanical advantage and reduce the required effort, but the basic function shown here is changing the direction of the applied force. The other options describe unrelated functions—converting AC to DC and measuring voltage—which are not what pulleys do.

Pulleys are used to redirect the force you apply, letting you pull in a more convenient direction to lift or move a load. A fixed pulley simply changes where the rope goes, so you can pull downward to lift upward without increasing the effort due to direction alone. In more complex pulley systems you can gain mechanical advantage and reduce the required effort, but the basic function shown here is changing the direction of the applied force. The other options describe unrelated functions—converting AC to DC and measuring voltage—which are not what pulleys do.