Simple Machines

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Simple Machines

• Chapter 16 Review

Lets Get Started!
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• Using force to move an object

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• work

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• A bar that turns on a fixed point

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• lever

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• Two inclined planes placed back to back

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• wedge

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• A wheel with a rope around it

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• pulley

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• A simple machine that makes moving or lifting
  things easier

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Inclined plane
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• A simple machine that is like a nail with threads
  wrapped around it

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• screw

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• The fixed point on a lever

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• fulcrum

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• A machine that needs only one force to make it
  work

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• Simple machine

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What type of simple machine is a screwdriver?

1. Inclined plane
2. Lever
3. Pulley
4. Wheel-and-axle

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• D. Wheel-and-axle

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Sally is making a poster to show pictures of
levers. Which object should NOT be on her poster?

1. Nail
2. Rake
3. Broom
4. Crowbar

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• A. Nail

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Which of these is not an example of work?

1. Lifting a book
2. Opening a door
3. Drawing with a marker
4. Adding numbers in your head

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• D. Adding numbers in your head

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A screw is made of a post and another kind of
simple machine. What is that other kind of
simple machine?

1. Inclined plane
2. pulley
3. wedge
4. Wheel-and-axle

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• A. Inclined plane

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How is the shovel being used in this picture?

1. As a wheel-and-axle
2. As a wedge
3. As an inclined plane
4. As a lever

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• D. As a lever

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Charlies class is learning about simple
machines. His teacher has written the names of
four simple machines in a table on the board. As
she points to each name, Charlie gives an example
of that machine. She writes down what he says.
Which simple machine is correctly paired with its
example?

1. lever
2. wedge
3. inclined plane
4. pulley

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• B. Wedge

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A jar lid has threads. These threads help hold
the lid tightly on the jar. What simple machine
is a jar lid?

1. lever
2. pulley
3. wedge
4. screw

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• D. Screw

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Mr. H is telling his class about the human body.
He describes how some athletes lift weights to
make their arms stronger. An athlete holds a
weight in her hand and bends her arm at the
elbow. The elbow acts as a fulcrum. In this
example, the arm is a simple machine. Which
machine is it?

1. lever
2. pulley
3. screw
4. Wheel-and-axle

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• A. lever

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Linus needs to keep a door propped open. Predict
which simple machine Linus will choose to do the
job. Explain.
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Linus will choose a wedge. He will push the
wedge between the door and the floor. The wedge
will keep the door open.
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Interpret the pictures to decide which screw is
easier to turn. Explain.
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Screw A is easier to turn because it has threads
that are closer together.
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The pictures show two simple machines. Tell how
the machines are alike.
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Both are simple machines that can be used to
raise an object.
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Snoopy has made two ramps. Ramp A is steeper
than Ramp B. Which ramp will make it easier for
Snoopy to move the block of wood? Tell how you
know.
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Ramp B will be easier, because it is less steep.
This means Snoopy will use less force to push the
block of wood up Ramp B than up Ramp A.