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Work And Simple Machines Test (II)
Test Description: Unit 8 Review for 8th grade
Instructions: Answer all questions to get your test result.
1) What two things must happen for work to be done?
A
The object must move and the mechanical advantage must be greater than 1
B
The object must move in the same direction as the force
C
The object must move and there must be an output force
D
The object must move in the oppostie direction of the force
2) What does a fixed pulley change?
A
the direction of a force
B
the speed of a force
C
the size of a force
D
the timing of the force
3) If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?
A
the shape of the weights
B
the amount of output force
C
the strength of the person doing the lifting
D
how high the barbell is being lifted
4) Which of the following is the comparison of a machine's work output with the work input?
A
mechanical advantage
B
force
C
mechanical efficiency
D
power
5) What is the work done by a machine on an object?
A
work output
B
lever
C
power
D
work input
6) What is it called when a force causes an object to move in the direction of the force?
A
power
B
work
C
energy
D
force
7) How does a ramp make lifting a heavy object easier?
A
The ramp increases the amount of work you do
B
More force is needed to move the object over a longer distance
C
Less force is needed to move the object over a longer distance
D
The object is moved over a shorter distance
8) A doorknob is an example of a
A
lever
B
screw
C
pulley
D
wheel and axle
9) What is a device that makes work easier by changing the size or direction of force?
A
machine
B
power
C
force
D
watt
10) 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
efficiency
B
power
C
work input
D
work output
11) Chris and Jane are lifting boxes to put them on shelves. Chris does 200 J of work in 5 minutes and Jane does 200 J of work in 4 minutes. What is the difference between the two jobs?
A
the work
B
the power
C
the output force
D
the input force
12) Which of the following is NOT a wedge?
A
chisel
B
plow
C
knife
D
ramp
13) What is a machine with a grooved wheel that holds a cable?
A
wedge
B
wheel and axle
C
lever
D
pulley
14) A construction worker is lifting a load of bricks onto a truck. He does 200 J of work in 40 seconds. What is his power output?
A
50 W
B
50 J
C
5 W
D
5 J
15) Which of the following is a compound machine?
A
screw
B
lever
C
block and tackle pulley
D
wheel and axle
16) Which of the following causes machines not to be 100% efficienct?
A
input force
B
output force
C
power
D
friction
17) Greg applies a force of 100 N to move a box 5 meters. How much work did he do?
A
500 J
B
500 N
C
100 J
D
5 J
18) What is machine that is made of two simple machines?
A
lever
B
simple machine
C
compound machine
D
pulley
19) What is the work that you do on a machine?
A
work input
B
lever
C
power
D
work output
20) Force times _______________ is the formula to calculate work.
A
machines
B
work
C
distance
D
kinetic
*select an answer for all questions
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