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WorksheetsWork, Power, Simple Machines, Mechanical Advantage
Total questions: 25
Worksheet time: 1hrs 19mins
Name
Class
Date
1.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
2.
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds. How much power was used?
a)
360 W
b)
60 W
c)
3600 W
d)
600 W
3.
800 Newtons of force moving a distance of 20 meters will be how much work done?
a)
40 J
b)
1,600 J
c)
400 J
d)
16,000 J
4.
500 Watts of power took in 90 seconds results in how work was done?
a)
45,000 watts
b)
45,000 J
c)
4,500 J
d)
5.55 J
5.
How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?
a)
3.8 m
b)
3.7 m
c)
3.2 m
d)
3.6 m
6.
What is power?
a)
transfer a force through a distance
b)
the rate of speed
c)
the rate of work being done
d)
transfer of space over time
7.
A Mustang has more horsepower than your mom's minivan. What does this mean?
a)
The Mustang has a higher topspeed.
b)
The minivan has a worse gas mileage.
c)
The Mustang can do work faster.
d)
The Mustang will die.
8.
The efficiency of a machine can be increased by reducing __________________________.
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
9.
The amount of work done in a certain amount of time is known as
a)
work
b)
effort force
c)
resistance force
d)
power
10.
Work is done on an object when the object moves in the SAME direction in which the force is applied.
a)
True
b)
False
11.
What is the measure of how much input work is changed into output work?
a)
resistance force
b)
efficiency
c)
mechanical advantage
d)
effort force
12.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
13.
The more POWER you use to move an object, the more work you do.
a)
True
b)
False
14.
What is mechanical advantage?
a)
The advantage a machine has over a bicycle
b)
A measure of how much a simple machine reduces work
c)
A measure of when is the best time to use a simple machine
d)
A measure of the force multiplied by using a tool
15.
How long did it take to do 700 J of work with 35 Watts of Power?
a)
24,500 seconds
b)
0.05 seconds
c)
20 seconds
d)
735 seconds
16.
A pulley system has a work output of 300 J. The work input is 550 J. What is the efficiency of the system?
a)
1.8 %
b)
54.5 %
17.
A simple machine has an efficiency of 35%. The work required by the machine is 750 J. What is the output of the machine?
a)
2142 J
b)
21.4 J
c)
262.5 J
d)
26,250 J
18.
A ramp has an efficiency of 42% and has a work output of 890 J. What work was put into the ramp?
a)
37,380 J
b)
373.8 J
c)
21.2 J
d)
2,119 J
19.
An axe has a Mechanical Advantage of 3.5 and needs a force of 200 N from the lumberjack. What is the output force of the tool?
a)
57.1 N
b)
700 N
c)
0.0175 N
d)
203.5 N
20.
A doorknob supplies a force of 345 N to the lock and has a Mechanical Advantage of 4. What is the force a person's hand puts on the doorknob?
a)
86.25 N
b)
1380 N
c)
349 N
d)
0.012 N
21.
A screwdriver needs an input force of 57 N and delivers an output force of 211 N. What is the Mechanical Advantage of the tool?
a)
0.27
b)
27%
c)
3.7 N
d)
3.7
22.
What is the Ideal Mechanical Advantage of a lever that has an input distance of 50 cm and an output distance of 5 cm.
a)
0.1
b)
10
c)
250
23.
What is the output distance of a ramp that has a sloped surface of 3 meters and an IMA of 2.
a)
1.5 m
b)
5 m
c)
6 m
d)
0.67 m
24.
If a wheel and axel has an IMA of 3.5 and an output axel diameter (distance) of 0.75 m, what is the input wheel diameter (distance)?
a)
2.6 M
b)
4.7 M
c)
4.25 m
25.
If a simple machine has an input distance of 50 m and an output distance of 8 m, what is the IMA of the tool?
a)
400
b)
0.16
c)
6.25
d)
58
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