Question

Select all that apply.

A pulley can be used to _____.

increase the amount of work done
change the weight of the resistance
multiply the effort force
change the direction of the applied force

Answer 1

Step 1: A pulley, if frictionless, can produce only the same amount of work as the work done upon it, therefore it cannot increase the work.

Step-by-step explanation:

Therefore option(a) is rejected, being incorrect.

Step 2: A pulley can keep the work of resistance unchanged but cannot change it.

Step-by-step explanation:

Therefore option(b) is also rejected, being incorrect.

Step 3: A pulley cannot be used to multiply the effort force,

Step-by-step explanation:

Therefore option(c) is rejected as well, being incorrect.

Step 4: The function of a pulley is to change the direction of the force.

Step-by-step explanation:

Therefore option(d) is the correct option for this question.

Step-by-step explanation: