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© Mark E. Damon - All Rights Reserved
© Mark E. Damon - All Rights Reserved
VocabularyTypes of Simple
Machines
Using Simple
Machines
How Simple Machines
Work
Simple Machines
Hodge-Podge
$100 $100 $100 $100 $100
$200 $200 $200 $200 $200
$300 $300 $300 $300 $300
$400 $400 $400 $400 $400
$500 $500 $500 $500
© Mark E. Damon - All Rights Reserved
$100$100
A device that makes work easier by changing the size or direction of
force is called what?
A device that makes work easier by changing the size or direction of
force is called what?
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simple machine simple machine
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What is the name of the fixed point on a lever?
What is the name of the fixed point on a lever?
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fulcrumfulcrum
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The use of force to move an object over a distance is known
as…
The use of force to move an object over a distance is known
as…
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work work
Scores
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How quickly work is done is called…. How quickly work is done is called….
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power power
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What is the number of times the machine multiples force?
What is the number of times the machine multiples force?
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Mechanical Advantage Mechanical Advantage
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The unit used to express power is what?
The unit used to express power is what?
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a watt a watt
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How can you calculate the mechanical advantage of a
pulley?
How can you calculate the mechanical advantage of a
pulley?
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Count the number of ropes other than the effort rope.
Count the number of ropes other than the effort rope.
Scores
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What compares a machine’s work output with its work input?
What compares a machine’s work output with its work input?
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Mechanical efficiencyMechanical efficiency
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© Mark E. Damon - All Rights Reserved
$400$400A simple machine made of a post with
an inclined plane around it
(a) wheel-and-axle
(b) screw
(c) pulley
(d) wedge
A simple machine made of a post with an inclined plane around it
(a) wheel-and-axle
(b) screw
(c) pulley
(d) wedge
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$400$400
(b) screw (b) screw
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$500$500
You want to lift a box that weights 60 N. If the mechanical advantage of
your lever is 3, how much force will you need to apply to do the job?
You want to lift a box that weights 60 N. If the mechanical advantage of
your lever is 3, how much force will you need to apply to do the job?
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Fload
Fappl
20 N
Fload
Fappl
20 N
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What type of lever is this:What type of lever is this:
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2nd class lever2nd class lever
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What is the mechanical advantage of this wheel and axle?
What is the mechanical advantage of this wheel and axle?
2040
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2 2
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Which two simple machines make up a pair of scissors?
Which two simple machines make up a pair of scissors?
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A lever and a wedge A lever and a wedge
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$400$400How is the screwdriver being used in
this picture?
(a) as a lever
(b) as a screw
(c) as a pulley
(d) as a wheel-and-axle
How is the screwdriver being used in this picture?
(a) as a lever
(b) as a screw
(c) as a pulley
(d) as a wheel-and-axle
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(a) as a lever (a) as a lever
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Norman pushes a lever down 5 meters with a force of 50 N. A box with a
weight of 30 N at the other end goes up 100 cm. What is the efficiency of the
machine?
Norman pushes a lever down 5 meters with a force of 50 N. A box with a
weight of 30 N at the other end goes up 100 cm. What is the efficiency of the
machine?
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Scores
12%
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What does a fixed pulley change?What does a fixed pulley change?
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The direction of the force The direction of the force
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Which class of lever changes the direction of the force applied?
Which class of lever changes the direction of the force applied?
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1st class lever 1st class lever
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Work output should always equal work input with an ideal
machine. However, in the real world this does not happen.
Why not?
Work output should always equal work input with an ideal
machine. However, in the real world this does not happen.
Why not?
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Friction between the machine’s part causes some work to be
converted.
Friction between the machine’s part causes some work to be
converted.
Scores
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When a machine increases the distance over which a force is exerted, what happens to the
size of the force exerted?
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The size of the force must decrease.
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You are moving a heavy box into the back of a truck. Would you rather use a steep ramp, a less-steep ramp, or a ladder? Explain your
choice.
.
You are moving a heavy box into the back of a truck. Would you rather use a steep ramp, a less-steep ramp, or a ladder? Explain your
choice.
.
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Scores
I would rather use a less-steep ramp. Using a less-steep ramp to move the heavy box would require less effort (force) , but you would move the box a greater distance.
If I used a steep ramp, I would have to use more effort because I would be moving the box a shorter distance forward.
If I used a ladder, I wouldn’t be going any distance forward, and I would have to carry the load straight up, which would be very hard.
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$100$100Scientists have a special meaning for
work. Which one of these is an example of scientific work?
(a) pushing on a door that won’t open
(b) lifting a box off the floor
(c) standing still with a backpack strapped to your back
(d) reading a textbook
Scientists have a special meaning for work. Which one of these is an
example of scientific work?
(a) pushing on a door that won’t open
(b) lifting a box off the floor
(c) standing still with a backpack strapped to your back
(d) reading a textbook
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(b) lifting a box off the floor (b) lifting a box off the floor
Scores
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$200$200Look at the labeled parts of the
diagram. Which part shows a fulcrum?
(a) Part A
(b) Part B
(c) Part C
(d) Part D
Look at the labeled parts of the diagram. Which part shows a
fulcrum?
(a) Part A
(b) Part B
(c) Part C
(d) Part D
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(d) Part D (d) Part D
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How could you increase the mechanical advantage of a first class lever?
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Move the fulcrum closer to the load.
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$400$400Which simple machine is shown
in the diagram? (Be specific)Which simple machine is shown
in the diagram? (Be specific)
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Third class lever Third class lever
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Which machine always has a mechanical advantage of less than 1?
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Scores
Third-class lever
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