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Pulleys (Grades 11-12)

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Pulleys

Instructions: Answer the following questions, based on your knowledge of pulley systems.

1. 
Which of the following correctly defines what a pulley system can do?
  1. It can change the direction of the force.
  2. It can increase the output force.
  3. It can minimize the output force.
  4. (1) and (2)
  5. (1) and (3)
2. 
What does the pulley system shown below do to the force?
Fixed Pulley
  1. The force is multiplied.
  2. Only the direction of the force is changed.
  3. The number of lines determines how much the force increases by.
  4. The force is divided.
3. 
In the pulley system shown below, the force exerted on the machine is 30 N, and the force exerted on the load (the bucket) by the machine is 20 N. If the machine is moved by a distance of 20 cm, by what distance does the load (the bucket) move?
Fixed Pulley
  1. 20 cm
  2. 25 cm
  3. 30 cm
  4. 35 cm
4. 
Which of the following behaves most like a first-class lever, with the fulcrum between the force and the load?
  1. A movable pulley
  2. A single fixed pulley
  3. A block and tackle system
  4. A combination of one movable and one fixed pulley
5. 
In the pulley system shown below, the force exerted on the machine and on the load by the machine are equal. Which of the following correctly represents the ideal mechanical advantage (IMA) of the pulley system?
Fixed Pulley
  1. 1, because only the direction of the input force is changed.
  2. 1, because the input force is not multiplied or changed in any way.
  3. 2, because the input force is doubled by the presence of another load.
  4. 0, because the input force is balanced by the output force.
6. 
Given the diagram shown below, if the rope is pulled with an input force of 10 N, what would be the output force?
Movable Pulley
  1. 5 N
  2. 10 N
  3. 15 N
  4. 20 N
7. 
The system shown below consists of which of the following?
Pulley System
  1. A movable pulley, only
  2. A fixed pulley, only
  3. Two movable pulleys
  4. A movable and a fixed pulley
  5. Two fixed pulleys
8. 
Which of the following statements correctly describes the pulley system shown below?
Pulley System
  1. It has an IMA of 1, because it only changes the direction of the force.
  2. It has an IMA of 2, because there are only two support ropes.
  3. It has an IMA of 3, because there are three support ropes.
  4. None of the above.
9. 
The pulley system shown below involves an input force lifting 240 N of load a distance of 10 cm. Given that the machine is moved a distance of 30 cm, what is the input force? Show your work.
Pulley System










10. 
Explain why the ideal mechanical advantage of a single fixed pulley system is 1.










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