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Work And Machines 2
Test Description: Ch 8 Test
Instructions: Answer all questions to get your test result.
1) The rate at which energy is transferred
A
work
B
watt
C
joule
D
power
2) The number of times a machine multiplies force
A
mechanical advantage
B
work output
C
work input
D
mechanical efficiency
3) A machine with a grooved wheel that holds a cable
A
pulley
B
screw
C
lever
D
wheel and axle
4) In which situation is a person doing work on an object?
A
A worker holds a box 1 m off the floor
B
A man exerts 350 N force on a rope attached to a house
C
a school crossing gurad raises a stop sign to weigh 10 N
D
a student walks while wearing a backpack that weighs 15 N
5) Which of the following are simple machines used by Eqyptians to build pyramids?
A
inclined planes and levers
B
screws adn screwdrivers
C
wheels and axles
D
plows and axes
6) If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?
A
how high the barbell is being lifted
B
the amount of output force
C
the strength of the perosn doing the lifting
D
the shape of the weights
7) How does a ramp make lifting a heavy object easier?
A
the object is moved over a shorter distance
B
Less force is needed to move the object over a longer distance
C
the ramp increases the amount of work you do
D
more force is needed to move the object over a longer distance
8) If an identical stack of books is lifted the same distance and one person does the job twice as fast, which of the following is done twice as much?
A
work input
B
efficiency
C
power
D
work output
9) By conparing the mechanical advantage of two machines, what can you tell about the machine?
A
which has a larger output force
B
which has a larger input force
C
which makes work easier
D
which is bigger
10) If the work output of a machine is always less than the work input, where does the missing work go?
A
it is used to keep the machine running
B
it is used to get the machine started
C
there isn't enough power present
D
it is used to overcome the friction created by the machine
*select an answer for all questions
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