Simple Machines (Grade 7)
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Simple Machines
1.
Which example uses a wedge as a simple machine?
- stairs
- ax
- doorknob
- screw
2.
How many simple machines are there?
- four
- five
- six
- 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.
- True
- False
6.
The length of a ramp is divided by its height to determine the mechanical advantage of a wheel and axle.
- True
- False
7.
A force that makes objects pull toward each other is known as .
- friction
- gravity
- gear
- lever
8.
A push or a pull is called .
- wheel and axle
- fulcrum
- load
- force
9.
The ability to do work is .
- force
- energy
- pulley
10.
A wheel with jagged edges like teeth is a(n) .
- pulley
- gear
- wheel and axle
11.
A force caused by objects rubbing together that slows moving objects is known as .
- gravity
- load
- friction
- fulcrum
12.
an object that is being moved
- force
- work
- energy
- scewdriver
13.
Find the mechanical advantage for the inclined plane.
[math]MA= L/H[/math]
L = 60 cm H = 15 cm
[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
[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
[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
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
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
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
Wheel radius = 1025 cm axle radius = 5 cm
20.
Mechanical Advantage for Inclined Plane
MA= L/H
L = 56 cm H = 7 cm
MA= L/H
L = 56 cm H = 7 cm
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