# 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.

- friction
- gravity
- gear
- lever

8.

A push or a pull.

- wheel and axle
- fulcrum
- load
- force

9.

The ability to do work.

- force
- energy
- pulley

10.

A wheel with jagged edges like teeth.

- pulley
- gear
- wheel and axle

11.

Force caused by objects rubbing together that slows moving objects.

- 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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