Name _________________________
Date _____________________________
Simple Machines
Everytime you pick up a book, climb the stairs, or open or a
door, you are doing work. In science, you do ______ when
you use a _____________________________. Recall that a
force is a push or a pull. Simple machine_________________.
What is a simple machine?
A ________________________________ is a tool that makes work easier. It does not do the work for you.
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It changes the way _______________________________________________________
A simple machine had ________________________ moving parts.
The ________________________________ _____________________________________________
are the six kinds of simple machines.
Kinds of simple machines
Inclined Plane
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An ______________________________ is a slanted surface that connects a lower place with a higher
place.
A _______________________________ is an inclined plane. The ramp shown below is also an inclined plane.
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It is much easier to move an object _____________________________________than straight up.
For example, it might take _____________________________ for the guy to lift the barrel straight up
form the ground.
It takes __________________________ for him to push the barrel up the ramp.
The guy has to move the barrel ____________________________________________ up the ramp,
but he uses ________________________.
The work is easier because it is ____________________________ over a longer distance.
Wedge
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A ____________- is made of ________ inclined planes placed _____________________________.
You ______________ a wedge ____________ an object.
A wedge changes the ______________________________________ so that it pushes sideways in two
directions. Wedges are often used __________________________ things. You can use a wedge to
split a log in half. _______________________________________ are kinds of wedges.
Lever
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A ____________ is a bar that rest on a support called a ___________________.
Many common objects are levers. For example, __________________________________.
You can use a lever to ______________________ a heavy object.
A lever _____________________________ in which you use the ___________.
Pushing down on ________________ of the lever ______________________ at the other
end.
The picture shows a stick as a _____________. The fulcrum is the ___________________
under the stick. Pushing down on the long end of the stick will lift the large rock at the other
end.
Screw
 A screw is an inclined plane wrapped around a pole.
 When you turn a screw, the work is spread over the whole distance of the inclined plane.
 You use less force, so the work is easier.
 Some screws hold things together. Others are used to lift objects.
Pulley
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To_________________________________________________an object, you might use a pulley.
A _________________ is a wheel with a rope or chain around it.
The rope fits in a groove in the wheel. Pulling down on one end of the rope ___________________
tied to the other end. A simple pulley makes work easier by letting you _______________________.
A_____________________has a pulley for raising and lowering a flag. Some ________________
include pulleys used to open and close them.
Wheel and axle
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A __________________________ is a wheel attached to a similar round bar. The bar is the ________.
When you turn the wheel, you make the _______________________.
A wheel and axle makes it _____________________________ something.
The __________________ shown below is a wheel and axle. It takes ____________________ to turn
the wheel than it would to turn the axle by itself. The wheel is ________________than the axle, so
the work is ________________________________________________.
______________________________________________________________ all have wheels and axles.
A car’s ______________________ uses a wheel and axle to make it _______________________- the
car. A _________________ is also a wheel and axle. The ________________ is the wheel, and the
___________________ is the axle. A screwdriver makes it easier to turn a screw.
Discussion Question:
A screwdriver is a wheel and axle. You can also use a screwdriver
to pry up the lid on a can of paint. When you use it that way,
what simple machine is the screwdriver? Explain.
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Vocabulary
1. pulley: is a wheel with a rope or chain around it.
2. wheel and axle: is a wheel attached to a smaller
round bar.
3. work: to use force to move an object.
4. Screw: is an inclined plane wrapped around a pole.
5. wedge: is made of two inclined planes placed back to
back.
6. lever: is a bar that rest on a fulcrum .
7. fulcrum: is the support on which a lever rest.
8. inclined plane: is a slanted surface that connects a
lower place with a higher place.
9. simple machine: is a tool that makes work easier. It
does not do the work for you.
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