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.
when someone uses a pulley to raise a window blind, the direction of the force is changed, making the work easier.
choose the correct answer
how does pulling down on a cord make it easier to raise window blinds?
the width of the force is changed.
the temperature of the force is changed.
the direction of the force is changed.

Explanation:

The question is about how a pulley (a machine) helps in raising window blinds. From the text, it's stated that machines can change the direction of force to make work easier, and for pulleys used in blinds, the direction of force is changed. The first option about "width of force" is incorrect as force doesn't have width in this context. The second option about "temperature of force" is also incorrect as force isn't related to temperature here. The third option matches the explanation about changing the direction of force.

Answer:

The direction of the force is changed.