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Mechanical Advantage (Grade 9)

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Mechanical Advantage

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1. 
Jacob positions a class 1 lever so that the end he pushes down on is 0.5 m from the fulcrum. The object he is trying to lift is 0.1 m from the fulcrum. What is the IMA of the lever as he has it set up?
  1. 0.2
  2. 0.5
  3. 5
  4. 2
2. 
Mr. D needs to create a lever with a mechanical advantage of 0.4. If he is going to apply his force 2 meters from the fulcrum, how far away must his load be from the fulcrum to get the correct mechanical advantage?
  1. 5 meters
  2. 0.2 meters
  3. 1 meter
  4. None of the Above
3. 
If a machine has a mechanical advantage less than one, which of the following must be true:
(Think carefully)
  1. The Effort Force is less than the Resistance Force
  2. The Effort Distance is greater than the Resistance Distance
  3. The Effort Distance is less than the Resistance Distance
  4. The Effort Force and Resistance Force are the same.
4. 
Raenisha has a machine with a mechanical advantage of 3.7. She inputs a force of 23 N. What is the output force?





5. 
Which of the following is true about a single, fixed pulley?
  1. It has a mechanical advantage less than 1
  2. It has a mechanical advantage equal to 1
  3. It has a mechanical advantage greater than 1
  4. It has no friction.
6. 
CJ has placed a 25 kg mass on the end of a first-class lever. At the other end, he applies a 60 N force to balance the lever. What is the mechanical advantage of his lever?

Given: Mass [math]m=25kg[/math], input force [math]F_i=60N[/math]





7. 
Samantha has a mass of 65 kg, and she has a simple lever with a mechanical advantage of 4. What is the maximum weight of an object that she can lift when she stands on one end of the lever?





8. 
In the 1800s, a German prince designed a hand-cranked machine to lift water from a stream to the kitchen window. The machine required 200 N of applied force to lift 100 kg of water. What is the mechanical advantage of the prince's machine?





9. 
Austin needs to lift a 300 N object using only 100 N of force. To accomplish this, he will need a simple machine with a mechanical advantage of what?
  1. 3
  2. 0.3
  3. 90%
  4. None of the Above
10. 
Asher has placed a 60 kg weight at the end of a 4 m lever. How far should the fulcrum be from the weight so that he can lift the weight with only 35 N of force?





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