Question

how does a single fixed pulley, like the one seen here, help you do work?
a changes the direction of the force
b increases the amount of applied force
c decreases the amount of applied force
d allows you to pull the rope a shorter distance

Explanation:

A single fixed pulley's main function is to change the direction of the applied force (e.g., pulling down to lift an object up). It doesn't increase/decrease force or shorten rope pull distance. So option A is correct.

Answer:

A. changes the direction of the force