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WorksheetsWork and Power
Total questions: 65
Worksheet time: 2hrs 36mins
Name
Class
Date
1.
It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box in Joules?
a)
200 J
b)
20.0J
c)
100 J
d)
10 J
2.
All of the following describe situations in which work is done by an organism EXCEPT for which situation?
a)
A bird carries a worm to it's nest
b)
A squirrel hides a nut in a tree
c)
Ants bring crumbs into their homes
d)
Leave decompose on the forest floor
3.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
4.
Work done = Force x blank?
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
5.
In which of the following situations do your arms do work on books?
a)
holding a heavy stack of books while standing
b)
carrying a heavy stack of books
c)
dropping a stack of books onto a table
d)
picking up a pile of books from the floor
6.
You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?
a)
54 J
b)
6.0 J
c)
21 J
d)
27 J
7.
What is the unit used to measure Power?
a)
Joule
b)
Watt
c)
Newton
d)
Pascal
8.
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of ___, but different amounts of _____
a)
work, energy
b)
power, work
c)
work, power
d)
force, work
9.
What type of simple machine is found on the cap of a pickle jar?
a)
lever
b)
inclined plane
c)
pulley
d)
screw
10.
Which of these is an example of a wedge?
a)
skateboard
b)
broom
c)
stairs
d)
butter knife
11.
Which is an example of someone using a simple machine to do work?
a)
a boy runs across a football field
b)
a banker counts money
c)
a mother pushes a stroller up a ramp
d)
a girl eats a sandwich
12.
Which of the following does a simple machine do?
a)
allows the users to apply less force over a longer distance
b)
reduce the amount of force needed to do work
c)
Both of the above
13.
A _____ is a fixed bar that us free to move around a fixed point known as a fulcrum.
a)
pulley
b)
inclined plane
c)
lever
14.
Consists of two circular objects; a central shaft and a wheel.
a)
wheel and axle
b)
screw
c)
pulley
15.
A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?
a)
lever, wheel and axle, pulley
b)
wheel and axle, inclined plane, pulley
c)
wheel and axle, pulley, inclined plane
16.
If an object is too heavy to move up a ramp, what is the best way to fix the problem?
a)
Increase the slope of the ramp
b)
Increase the elevation of the ramp
c)
Increase the length of the ramp
d)
Increase the friction of the ramp
17.
How are Horsepower and watts similar?
a)
both units of work.
b)
they are both useless
c)
They are both the si units of work
d)
they are both units of power
18.
A machine is a device that changes _____.
a)
Time used
b)
Input force used
c)
Distance
d)
A force
19.
what is work input?
a)
The work done by the input force acting through the input distance
b)
The force you exert on a machine
c)
The distance the input force acts through is known as the input distance.
d)
Horsepower
20.
What is input distance?
a)
The work done by the input force acting through the input distance
b)
The distance the input force acts through is known as the input distance.
c)
The force you exert on a machine
d)
Watts
21.
What is a wedge?
a)
A combination of two or more simple machines that work together.
b)
A v shaped object whose sides are two inclined planes sloped toward each other
c)
A combination of two or more simple machines that work together.
22.
What is the ideal mechanical advantage?
a)
All of these
b)
none of these
c)
The mechanical advantage of a machine in the absence of friction
d)
The number of times that a machine increases an input force.
23.
Which of these people does the most work?
a)
Someone applies a force of 10 newtons over 10 meters
b)
Someone applies a force of 5 newtons over 10 meters
c)
Someone applies a force of 10 newtons over 5 meters
d)
Someone applies a force of 20 newtons over 10 meters
24.
There is a rope attached to an axle which is attached to a wheel. When you turn the wheel, what happens to the rope?
a)
The rope is pulled a longer distance with less force
b)
The rope is pulled a shorter distance with more force
c)
The rope is pulled the same distance with the same amount of force
d)
The rope is pulled a shorter distance with less force
25.
Which of these people has the most power?
a)
Someone does 5 joules of work in 5 seconds
b)
Someone does 8 joules of work in 2 seconds
c)
Someone does 2 joules of work in 5 seconds
d)
Someone does 1,000 joules of work in 2,000 seconds
26.
Distance/Time = __________?
a)
Speed
b)
Force
c)
Work
d)
Power
27.
Work/Time = ________?
a)
Force
b)
Speed
c)
Velocity
d)
Power
28.
A lever has its fulcrum in the exact center - both sides of the lever are the same length. What is the relationship between input force and output force in this lever?
a)
They are equal
b)
The input force is greater than the output force
c)
The output force is greater than the input force
d)
They are not equal, but which is stronger depends on which side you push down
29.
What do all machines do?
a)
Build things
b)
Move something
c)
Change the direction or strength of a force
d)
Make life easier
30.
Which of these machines does the most work?
a)
One that applies a force of 50 newtons over 10 meters
b)
One that applies a force of 3 newtons over 5 meters
c)
One that applies a force of 1 newton over 1 meter
d)
One that applies a force of 50 newtons over 20 meters
31.
What is friction?
a)
The study of matter
b)
A force that opposes motion
c)
energy sources from fossils
d)
all of the above
32.
What are energy and work measured in?
a)
Joule
b)
Watt
c)
Birds
d)
Newton
33.
What is potential energy?
a)
Energy due to position.
b)
Energy due to shape.
c)
Energy because of mass.
d)
Energy due to shape & position
34.
What is the transfer of energy that occurs when a force makes an object move?
a)
power
b)
work
c)
force
d)
efficiency
35.
A bar that fixed to a point, but is free to move is known as a what?
a)
wedge
b)
inclined plane
c)
lever
d)
fulcrum
36.
In "real" machines, some of the input work is transferred to what?
a)
light
b)
heat
c)
mass
d)
electricity
37.
When you pick up an object, what do you transfer to the object?
a)
mass
b)
power
c)
energy
d)
watts
38.
What is the force applied to the machine?
a)
work force
b)
effort force
c)
resistance force
d)
distance force
39.
What is a machine that does work with only one movement?
a)
complex machine
b)
simple machine
c)
ideal machine
d)
compound machine
40.
What is the distance through which the effort force is applied?
a)
work distance
b)
resistance distance
c)
output
d)
effort distance
41.
In an ideal machine, which of the following is true?
a)
Work input does not affect work output
b)
Work output is greater than work input
c)
Work input is greater than work output
d)
Work input equals work output
42.
Decreasing which of the following will increase the efficiency of a machine?
a)
input force
b)
output force
c)
power
d)
friction
43.
What is two of more simple machines being used together?
a)
Lever
b)
Dual machine
c)
Triple machine
d)
compound machine
44.
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
45.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
46.
Force is measured using which type of unit?
a)
Meters
b)
Kilograms
c)
Newtons
d)
Joules
47.
You push against the back of your friends car that is stuck. You push and be become very tired. Did you do work?
a)
Yes, work was done
b)
No, work wasn't done
48.
Person A is twice the weight of Person B and climb the same hill. If person A gets the top in half the time then...
a)
Person A is twice as powerful
b)
Person B is twice as powerful
c)
Person A is four times as powerful
d)
Person B is four times as powerful
49.
If Alan is on the right and George is on the left of a box, what needs to happen to make the box move to the right?
a)
Alan needs to push the box with more force than George.
b)
George needs to push the box with more force than Alan.
c)
Alan and George need to push the box with equal amounts of force.
d)
Alan and George need to pull on the box with equal amounts of force.
50.
Why does it take someone sledding longer to stop on ice than it does on grass?
a)
The ice makes the friction between the sled and the ground greater.
b)
The ice makes the friction between the tires and the ground less.
c)
All of the above
d)
None of the above
51.
Which is not a type of simple machine?
a)
spring
b)
screw
c)
pulley
d)
wedge
52.
Stairs
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
53.
A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?
a)
lever, wheel and axle, pulley
b)
wheel and axle, inclined plane, pulley
c)
wheel and axle, pulley, inclined plane
54.
How does a movable pulley make lifting objects easier?
a)
The amount of force needed is doubled
b)
the amount of force needed is increased
c)
the amount of force needed is reduced
d)
the amount of force needed stays the same
55.
Where should the fulcrum be placed in order for the student to use the least amount of effort possible?
a)
point A
b)
point B
c)
point C
d)
point D
56.
How does a single fixed puled, like the one seen here, help you do work?
a)
changes the direction of the force
b)
increases the amount of applied force
c)
decreases the amount of applied force
d)
allows you to pull the rope a shorter distance
57.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
58.
What is the mechanical advantage of the block and tackle used to lift the bale of cotton?
a)
1
b)
2
c)
3
d)
4
59.
When gliding across the ice while ice skating, how much work are you doing?
a)
0 J
b)
more than 0 J
c)
less than 0 J
d)
you need more info
60.
Consists of two circular objects; a central shaft and a wheel.
a)
wheel and axle
b)
screw
c)
pulley
61.
There is a rope attached to an axle which is attached to a wheel. When you turn the wheel, what happens to the rope?
a)
The rope is pulled a longer distance with less force
b)
The rope is pulled a shorter distance with more force
c)
The rope is pulled the same distance with the same amount of force
d)
The rope is pulled a shorter distance with less force
62.
A lever has its fulcrum in the exact center - both sides of the lever are the same length. What is the relationship between input force and output force in this lever?
a)
They are equal
b)
The input force is greater than the output force
c)
The output force is greater than the input force
d)
They are not equal, but which is stronger depends on which side you push down
63.
Two students played on the slide. Student A wore shorts and student B wore long pants. Which of these best explains why Student B moved down the slide more smoothly than Student A?
a)
more acceleration
b)
less gravity
c)
more weight
d)
less friction
64.
Which example shows an unbalanced force?
a)
A pencil sitting on a desk
b)
a car parked in a parking lot
c)
a coat laying on the floor
d)
a child sliding down a slide
65.
Which of these is an example of a balanced force?
a)
A book sitting on a chair
b)
a ball rolling down the road
c)
a fish swimming in its bowl
d)
a plate sitting in the sink
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