Simple Machine Pulley Quiz

Bob uses a pulley to lift his car 5 meters, he uses a force of 935 N. How much work has Bob done?

• 78 joules

• 4,675 joules

• 2,437 joules

• 253 joules

True or false: Using a pulley with 1 rope creates a mechanical advantage over not using a pulley.

• True

• False

Bill uses a pulley with 1 rope to lift a box. He applies a force of 126 N, the resistance force is also 126 N. If he adds another rope to his pulley, how much force does he need to apply this time?

• 504 N

• 2 N

• 252 N

• 63 N

Sally used a pulley to lift her couch onto a moving truck. She pulled with a force of 19 N and completed 32.3 joules of work. How many meters of rope did she pull?

• .58 meters

• 13.6 meters

• 1.7 meters

• 2.4 meters

What is the mechanical advantage of a pulley with 4 ropes?

• 4

• 3

• 2

• 1

A pulley is being used to lift boxes. It has a mechanical advantage of 7 and a resistance force of 2478 N. What is the effort force exerted on the pulley?

• 408 N

• 354 N

• 20 N

• 87.7 N

What is the best method to lift a heavy object using a pulley while exerting the least force?

• Adding more ropes to the pulley

• Using only 1 rope on the pulley

John lifts a dumbbell up 1 meter, Jane lifts the same dumbbell up 2 meters with a pulley with 2 ropes. Jane is exerting half the amount of force of John. Who has done the most work?

• John

• Jane

• They have done the same amount of work

What is the relation of the number of ropes on a pulley and the mechanical advantage?

• The number of ropes is equal to the mechanical advantage

• The number of ropes is greater than or equal to the mechanical advantage

• The number of ropes is less than or equal to the mechanical advantage

• There is no relation

If you decrease the amount of ropes on your pulley, how does the amount of force needed to apply change?

• The force needed decreases

• The force needed increases

• The force needed doesn't change