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