Inclined Planes

Inclined Planes

A simple machine has few or no moving parts. They make work easier by changing the direction of a force or by changing the amount of force needed.

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Inclined Planes are Simple Machines

https://www.generationgenius.com/videolessons/simple-machines-video-for-kids/

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​Overview Video

Multiple Choice

How many types of simple machines are there?

• 1

• 3

• 5

• 6

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There are 6 Simple Machines

Multiple Choice

Which simple machine will we be talking about?

• All of them

• Wedge

• Inclined Plane

• Pulley

• No moving parts

• A sloped surface used to move objects

• Changes the amount of force needed to move objects

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What is an inclined plane?

Multiple Choice

Which of the following is an example of an inclined plane?

• Screw

• Axe

• Slide

• All of the following

• ​Stairs

• Ramp

• Slide

• Axe

• Screw

• Lever

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Examples of inclined planes

Multiple Choice

Which of these situations would a n inclined plane be useful?

• Loading a motorcycle onto a trailer

• Unloading heavy boxes out of a semi truck

• Getting a roller coaster cart to the top

• All of the following

The head of the axe is actually made up of two inclined planes.

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Let's Take a closer look at an axe...

Multiple Choice

Does inclined planes impact the amount of work done?

• Yes

• No

• Maybe

They DO NOT change the amount of work done. It will stay the same

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Inclined Planes Impact on Work

Multiple Choice

How do we calculate work?

• W= Force/Distance

• W= Mass + Force

• W= Force x Distance

• W= Force + Distance

Work= Force x Distance​

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Formula for Work

They change the amount of force needed to do the same amount of work!

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So how do inclined planes help?

Multiple Choice

If we use an inclined plane to use less force, what happens to the distance we have to move the load?

• Increases

• Decreases

• Stays the same

The steeper the inclined plane, the more force needed. However, it is a shorter distance.

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​Steeper Inclined Planes

The less steep an inclined plane is, the less force is required to do the same amount of work, but distance increases.

When the distance a load has to travel increases, the force needed to move the load decreases.

​Less Steep Inclined Planes

Multiple Choice

Which ramp would require the least amount of force from your notes?

• 10 ft ramp

• 5 ft ramp

Multiple Choice

Why would the longer ramp require less force?

• It spreads the force over distance

• It decreases the amount of work done

• It decreases the mass of the load

If an inclined plane has a shorter distance, it will require MORE force to do the same amount of work.

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Shorter Inclined Planes

If the inclined plane has a longer distance, it will require LESS force to do the same amount of work. ​

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Longer Inclined Planes

Multiple Choice

Each of the below forces are needed to move the same box. The only difference is the length of the ramp. Which of the following most likely has the longest ramp?

• Force= 10 N

• Force= 1 N

• Force= 25 N

• Force= 15 N

​ALL simple machines involve a trade-off between force and distance. If one increases, the other decreases

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​What is something all simple machines have in common?

Inclined planes can help move heavy objects and the most common inclined plane is a ramp.

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​What do they help?

Multiple Choice

An inclined plane reduces the amount of force needed to move an object by —

• decreasing the gravity

• decreasing the mass

• increasing the distance

• decreasing the distance

Multiple Choice

How could students find out whether a short ramp or a long ramp would require less force to use? Measure the amount of force it takes to move —

• an object up two ramps with equal heights and equal lengths.

• one object up a ramp and a larger object up an identical ramp.

• an object up two ramps with the same height but different lengths.

• an object up two ramps with the same length but different heights.

Multiple Choice

Which of the following will require the least force to move the load up the inclined plane?

• c

• s

Multiple Choice

Which of the following will require the most force to move the load up the inclined plane?

• c

• s