Transcript Ch16Forces

Who Wants to
Be a
Millionaire?
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Machines
Click the appropriate dollar amount
at right to proceed to the question
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Phone A Friend
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have thirty seconds to discuss your
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Ask the Audience
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one…in a moment, we’ll ask you to
indicate, by show of hands, your choice
for the correct answer…”
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Fifty - Fifty
50/50
You’ve asked that two of the
wrong answers be eliminated,
leaving you with one wrong
answer plus the correct one.
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Correct
Correct!
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Incorrect
Sorry, That’s
Incorrect
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Question
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Dan and Paul push a box 4
meters with a force of 40
Newtons. How much work did
they do?
50/50
A
160
B
1600
C
100
D
1000
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The amount of work a machine
does is less than the amount
of work put into it. Why?
50/50
Some comes from
other places
Some goes into
B
the air
C Some changes
D Some is lost to
A
the temperature
friction
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The support in a lever is called
the ______________.
50/50
A
load
B
effort force
C
fulcrum
D
central joint
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Which of the following is an
example of work?
50/50
A
Hugging a tree
trunk
B
Pushing your
feet on a wall
C
Pulling weeds
out of a garden
D
Pushing on a wall
with your hands
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A jar has two lids that are the same size.
You can put one lid on by slamming
down hard on it with your fist. The other
lid is a screw-top lid that turns on. Which
statement below is true?
50/50
No work is done
A
here
C
First lid takes
more work
Both require the
B
same work
D Second lid takes
more work
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Which of the following is a
simple machine?
50/50
A
brick
C bread machine
B
computer
D
salad tongs
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A screw is a modified _______.
50/50
A
lever
C
inclined plane
B
wedge
D wheel and axle
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Which kind of lever has the
fulcrum in the middle?
50/50
A
Fourth-class
B
First-class
C
Third-class
D
Second-class
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What type of pulley has many
pulleys with one rope like the
one we made in class?
50/50
A
fixed pulley
C moveable pulley
B
reversible
pulley
D block and tackle
pulley
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How does a fixed pulley make
work easier?
50/50
A
Changes the
direction of force
C
Doubles the
movement of the
load
B
Reduces the
effort force
D
Increases the
distance of applied
force
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On a sailboat, the triangular
jibsail acts as a(n) __________.
50/50
A
lever
C
pulley
B
inclined plane
D wheel and axle
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A baseball bat is a type of
simple machine. Which of the
following BEST describes the
baseball bat?
50/50
A
wedge
B first-class lever
C
inclined plane
D third-class lever
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On a sailboat, a winch cranks
rope in and out. What kind of
simple machine is a winch
crank?
50/50
A wheel and axle
B
lever
C
D
wedge
screw
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In a lever what happens if the
fulcrum is close to the load?
50/50
A
Less work is
done
B
Less force is
needed
C
More work is
done
D
More force is
needed
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Which of the following simple
tools is most closely related to
an inclined plane?
50/50
A
shovel
B
crowbar
C
flagpole
D
wheelbarrow
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A child uses two inclined
planes joined together at an
angle to push through sand.
This machine is a __________.
50/50
A
screw
B
ramp
C
compound
machine
D
wedge
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Essays:
1)People who design machines try to reduce the friction
between the machine’s parts. Explain why they do this and
identify two ways you can reduce friction in machines.
2)In a wheel and axle simple machine, why is it important that
the diameter of the wheel be greater than the diameter of the
axle?
3)Identify a compound machine you use in your life. Identify
at least two simple machines that are in the compound
machine.
4)Explain how the formula for work relates to the scientific
definition of work.
5)Simple machines make work easier
1) Name two simple machines and how they make work easier
2) Provide two examples of each type of simple machine.