Question: Look at the illustration of the pulley system at the right to answer the questions. Explain the disadvantage of using this system compared to a single movable pulley system.
Reference answer: You have to pull 3 times more rope (apply the effort over a distance 3 times farther than the distance the load moves).

Student answer: The disadvantage of a single movable pulley is you have to pull or push the pulley up or down.

Student answer: You have to use more rope.

Student answer: You pull the effort up show how many Newtons you have to lift the load.

Student answer: You have to push or pull up or down.

Student answer: The disadvantage is that it is 3 times as much rope.

Student answer: You would pull 3 times.

Student answer: You have to pull 3 times as much.

Student answer: You would have to apply.

Student answer: 3 times harder to pull.

Student answer: It takes more rope.

Student answer: You will have to pull the rope farther.

Student answer: You will have to pull more rope.

Student answer: Pull longer.

Student answer: The distance of a single movable is 20 meters instead of 30 meters of that system.

Student answer: You have less distance to move the load.

Student answer: A single movable pulley has less rope, so it does not have to travel as much from 10 meters to lift the load.

Student answer: The picture shows a single fixed to single moveable effort upward which needs more effort than a single moveable.

Student answer: The single movable does not have as many rope supporting the load.

Student answer: There are more ropes that you have to pull.

Student answer: It takes more effort to lift the load.

Student answer: Single movable has a better directional advantage.

Student answer: This requires more rope to be pulled.

Student answer: There is more rope so you have to pull longer.

Student answer: For this you have to use an extra pulley.

Student answer: You have to pull a lot of rope.

Student answer: You have to pull more rope to get it farther with the single fixed, single movable upward.

Student answer: On this system you have to pull 3 times as much compared to 2 times as much rope.

Student answer: You have to pull the rope twice the distance you want to move it.

Student answer: You must pull the rope farther.

Student answer: There is more rope so you would have to pull longer.

Student answer: The disadvantage is that you would have to go to the top of the building then go back down.

Student answer: The disadvantage is that it is easier to lift with a single movable because it moves up faster to where you need it.

Student answer: A directional advantage.

Student answer: You need a longer string.

Student answer: Mechanical.

Student answer: There is twice as much rope.

Student answer: The single fixed to single movable upward is good to use, but single movable is a lot easier for you to lift the load because there is less rope supporting it.

Student answer: There are 3 rope supporting the load for 2 single fixed or single movable upward effort so on a single movable there are only 2 ropes supporting the load so the reduction is greater on a single fixed or single movable upward effort.

Student answer: You lose distance, for this pulley you have to move the effort 15 centimeters to move the load 5 centimeters. For the single movable to move the load 5 centimeters you only have to move the effort 10 centimeters.

Student answer: This pulley has a directional disadvantage and so does the single movable.