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. A fixed pulley lowers the amount of force needed to do the same amount of work.
B. A fixed pulley increases the distance over which the force is applied.
C. A fixed pulley helps Adam change the direction of the effort force.
D. All of these answers are correct.