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Ideal Mechanical Advantage of Levers (Grade 7)

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Ideal Mechanical Advantage of Levers

1. 
Which distances should be divided in order to calculate the ideal mechanical advantage of the lever below?
Second Class Lever
  1. [math](BA)/(BC)[/math]
  2. [math](BC)/(BA)[/math]
  3. [math](AC)/(BA)[/math]
  4. [math](BA)/(AC)[/math]
2. 
Which of the following statements would be true about the lever below if C was moved closer to A?
Third Class Lever
  1. the ideal mechanical advantage would increase
  2. the ideal mechanical advantage would decrease
  3. the ideal mechanical advantage would remain unchanged
3. 
When using a broom to sweep a floor, your mechanical advantage will be less than 1 and your fulcrum will be your hand at the top of the broom. This means the broom acts as a:
  1. Class 1 Lever
  2. Class 2 Lever
  3. Class 3 Lever
  4. Class 4 Lever
4. 
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
5. 
Greg sets up the lever below to help him lift box A by pushing down at point C. If B is located 50 cm from A and 150 cm from C, what is the ideal mechanical advantage of the lever?
First Class Lever
  1. 1/3
  2. 3
  3. 5
  4. 100
6. 
On the lever shown below, the distance from B to C is 2 feet and the distance from B to A is 4 feet. What is the ideal mechanical advantage of the lever?
Third Class Lever
  1. 0.5
  2. 1.0
  3. 2.0
  4. 8.0
7. 
The ideal mechanical advantage of the lever below is 5. If the distance from A to B is 30 cm, what is the distance from B to C?
First Class Lever
  1. 6 cm
  2. 35 cm
  3. 150 cm
  4. 180 cm
8. 
Calculate the ideal mechanical advantage of the lever shown, given the following distances:

B to A is 2 meters
A to C is 1 meter
Second Class Lever
  1. 0.5
  2. 1.0
  3. 1.5
  4. 2.0
9. 
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.
10. 
Russ is using a lever to lift a box. The lever has an ideal mechanical advantage of 6 and is set up as shown below. If the distance from the fulcrum to the load is 60 cm, what is the distance from the fulcrum to the effort force?
First Class Lever
  1. 3.6 cm
  2. 3.6 m
  3. 10 cm
  4. 10 m

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