Question

Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulley is helping him. How is the pulley helping Adam lift the object?
a. All of these answers are correct.
b. A fixed pulley lowers the amount of force needed to do the same amount of work.
c. A fixed pulley increases the distance over which the force is applied.
d. A fixed pulley helps Adam change the direction of the effort force.

Answer 1

A fixed pulley changes the direction of the effort force, but not its magnitude.

Answer 2

Explanation :

Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulley is helping him.

A pulley is a simple machine which always changes the direction of effort forces. It consists of a rope and a wheel.

The pulley can be of three types i.e. a fixed pulley, movable pulleys and combined-pulley systems.

Hence, the correct option is (d) " A fixed pulley helps Adam change the direction of the effort force ".