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# Simple Machines: What Is an Inclined Plane? (Grade 3)

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## Simple Machines: What Is an Inclined Plane?

Stairs may not look like a machine. They don't have motors or moving parts. But, stairs can be used to do work by moving objects up and down them. A set of stairs is an example of an inclined plane, one of the six simple machines.

The simplest inclined plane is a ramp. It is a smooth, tilted surface. If you need to move a heavy box from the ground to a higher position, using a ramp can help. Instead of lifting the box straight up, you can push it up the ramp. The ramp allows you do push the box with less force, but you push it over a longer distance. Can you think of other examples of inclined planes?
1.
An inclined plane is one of the six simple machines.
1. True
2. False
2.
A delivery person must move a heavy box up a ramp. Would it be easier to move the box up short, steeply tilted ramp or a long, gradually tilted ramp?
1. short, steeply tilted ramp
2. long, gradually tilted ramp
3.
Stairs are inclined planes. Which two other objects are most likely inclined planes?
1. ladder and slide
2. slide and hammer
3. doorknob and ladder
4. hammer and doorknob
4.
Keisha is going to the amusement park. Which ride at the amusement park is the best example of an inclined plane?
1. Ferris wheel
2. Bumper cars
3. Roller coaster
4. Merry-go-round
5.
Which sentence from the passage best explains how inclined planes help make work easier?
1. A set of stairs is an example of an inclined plane, one of the six simple machines.
2. The simplest inclined plane is a ramp.
3. If you need to move a heavy box from the ground to a higher position, using a ramp can help.
4. The ramp allows you do push the box with less force, but you push it over a longer distance.
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