Question

machines help us to do work. a machine is a device that makes work easier. it does this by changing the direction of the force, changing the amount of force, or changing the distance over which the force is being applied. work is defined mathematically as force times distance. using a pulley and rope system to move objects changes the direction of the force from pulling the rope straight up to using gravity as an advantage to pull the rope down. choose the correct answer how does using a pulley make it easier to raise a flag? the pulley changes the direction of the force. the pulley increases the amount of force exerted. the pulley decreases the distance the flag moves.

Explanation:

The text explains that a pulley changes the force direction for raising a flag (from pulling up to pulling down, using gravity). The first option matches this explanation. The second is wrong (pulley doesn't increase force here), and the third is wrong (distance doesn't decrease).

Answer:

The pulley changes the direction of the force.