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Simple Machines (Grade 7)

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Simple Machines

1. 
Which example uses a wedge as a simple machine?
  1. stairs
  2. ax
  3. doorknob
  4. screw
2. 
How many simple machines are there?
  1. four
  2. five
  3. six
  4. seven
3. 
Give one example of an inclined plane.



4. 
Give two examples of simple machines.



5. 
Wheel radius is divided by axle radius to determine the mechanical advantage of a wheel and axle.
  1. True
  2. False
6. 
The length of a ramp is divided by its height to determine the mechanical advantage of a wheel and axle.
  1. True
  2. False
7. 
A force that makes objects pull toward each other is known as                .
  1. friction
  2. gravity
  3. gear
  4. lever
8. 
A push or a pull is called                .
  1. wheel and axle
  2. fulcrum
  3. load
  4. force
9. 
The ability to do work is                .
  1. force
  2. energy
  3. pulley
10. 
A wheel with jagged edges like teeth is a(n)                .
  1. pulley
  2. gear
  3. wheel and axle
11. 
A force caused by objects rubbing together that slows moving objects is known as                .
  1. gravity
  2. load
  3. friction
  4. fulcrum
12. 
an object that is being moved
  1. force
  2. work
  3. energy
  4. scewdriver
13. 
           Find the mechanical advantage for the inclined plane.

[math]MA= L/H[/math]

L = 60 cm H = 15 cm
14. 
           Find the mechanical advantage for the inclined plane.
[math]MA= L/H[/math]
L = 80 cm H = 5 cm
15. 
           Find the mechanical advantage for the inclined plane.
[math]MA= L/H[/math]

L = 48 m H = 12 m
16. 
           Solve for the mechanical advantage of the wheel and axle.
MA = Wheel radius/axle radius

Wheel radius = 169 m axle radius = 13 m
17. 
           Solve for the mechanical advantage of the wheel and axle.
MA = Wheel radius/axle radius

Wheel radius = 125 cm axle radius = 5 cm
18. 
           Solve for the mechanical advantage of the wheel and axle.
MA = Wheel radius/axle radius

Wheel radius = 225cm axle radius = 15cm
19. 
             What is the mechanical advantage?
Wheel radius = 1025 cm axle radius = 5 cm
20. 
           Mechanical Advantage for Inclined Plane
MA= L/H

L = 56 cm H = 7 cm
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