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1. What is a simple machine? Give an example!

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1. What is a simple machine? Give an example!

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A simple machine is an object that helps you to spread the work.

An example of a simple machine is a wedge.

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2. What is a pulley, and why is it useful? Give an example!

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2. What is a pulley, and why is it useful? Give an example!

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A pulley is a simple machine that spreads the work and makes you pull the rope to lift the thing you put on the other side of the rope.

It's useful because it helps people lift stuff with less force.

An example of this is a crane because it uses a pulley to lift heavy objects.

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3. What is an inclined plane, and why is it useful? Give an example!

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3. What is an inclined plane, and why is it useful? Give an example!

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An inclined plane is a ramp that makes moving things more easy by taking some of the weight and making you put less work than lifting your object.

It's useful because it makes you use less force.

An example of this is when people use ramps to put things on/in their car.

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4. What is a lever, and why is it useful? Give an example!

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4. What is a lever, and why is it useful? Give an example!

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A lever is a simple machine that makes your work go in to the lever and not directly to the object.(less force)

It's useful because when you cant bend your arm it's useless.(look at the example)

An example of this is your forearm.

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5. What is a wheel and axle, and why are they useful? Give an example!

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5. What is a wheel and axle, and why are they useful? Give an example!

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A wheel and axle is something that makes your object role with less friction.(less force)

They're useful because we use them to move our self and objects.

An example of them being used is a set of car wheels.

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6. What is a wedge, and why is it useful? Give an example!

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6. What is a wedge, and why is it useful? Give an example!

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A wedge is a wide object that gets more thin as is gets longer.

It's useful because it is sharp and we put the force on to the wide part and more force comes out of the sharp end and it breaks/cuts objects with less force.

An example of this is an a doer holder.

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7. What is a screw, and why is it useful? Give an example! 

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7. What is a screw, and why is it useful? Give an example! 

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A screw is a simple machine that turns to cut/make a hole in objects to hold them in place.

It's useful because you do not ever have to check if an object is falling if a screw.

An example of this is lots of screws hold your carpet in place.