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WorksheetsWork, Power, and Simple Machines
Total questions: 38
Worksheet time: 1hrs 16mins
Name
Class
Date
1.
The amount of work necessary to move a dirt pile was 620J with 28.2N of force. How far was the dirt pile moved?
a)
22 m
b)
17,484 m
c)
28 m
d)
13,640 m
2.
A long distance runner travels 59.7m using 35,000J of work. How much force did the runner use?
a)
586 N
b)
593 N
c)
59 N
d)
60 N
3.
A student applied 1,860.2J of work to move a piano 4.2 meters. What amount of force did the student use?
a)
442.9 N
b)
7,812.84 N
c)
7,440 N
d)
465 N
4.
A student used 6.8N of force to move a desk chair 10m. How much work did the student need to move the chair?
a)
68 J
b)
1.5 J
c)
0.7 J
d)
61 J
5.
Caroline uses 20N of force to move a box of books 15m. How much work did she do?
a)
300 J
b)
1.33 J
c)
0.75 J
d)
35 J
6.
To complete a project, 200,000J of work are needed. The time taken to complete the project is 20 seconds. How much power is needed?
a)
10,000 W
b)
0.0001 W
c)
200,020 W
d)
1,000,000 W
7.
When a force moves an object, the amount of work done depends on ___.
a)
both the amount of force and distance the object moves.
b)
the distance the object moves.
c)
the amount of force.
d)
the speed of movement.
8.
If you try to lift a 300kg weight one meter, but you are unable to lift it at all, how much work have you done on the weight?
a)
300 N
b)
300 J
c)
300 kg
d)
none
9.
The amount of work done in a period of time is called ___.
a)
power
b)
force
c)
exertion
d)
impetus
10.
A 2kg object is moving across a frictionless surface with a constant velocity of 4 m/s. Which force is necessary to maintain this state of motion?
a)
0 N
b)
0.5 N
c)
2.0 N
d)
8.0 N
11.
How do we know when work is being done on an object?
a)
the object moves some distance in the direction force is applied
b)
a force is exerted on the object
c)
the object does not move, when the force is exerted on it
d)
the object moves a distance equal to the amount of force exerted on it
12.
A student lifts a box off the floor, and then walks to the other side of the room. When does the student do work?
a)
when lifting the box
b)
when walking across the room
c)
both when lifting the box and walking
d)
at no time does the student do work
13.
The ability to do work is ____.
a)
energy
b)
motion
c)
force
d)
velocity
14.
If it took 124N of force to push a cart, and the amount of work exerted was 2,640J, what distance did the cart travel?
a)
21.3 m
b)
46.9 m
c)
268 m
d)
2,516 m
15.
The number of times a machine multiplies your effort/input force is called ___.
a)
mechanical advantage
b)
mechanical efficiency
c)
power
d)
work
16.
Daniel and Ryan both work at a car wash. It takes Daniel 20 minutes to wash a car. Ryan can wash the same car in only 10 minutes. Ryan has ___.
a)
twice as much power as Daniel
b)
half the power that Daniel has
c)
twice the work compared to Daniel
d)
half as much work as Daniel
17.
It took Bradley 45s to do 300J of work moving a sofa into a moving truck. How much power did he exert?
a)
6.67 W
b)
300 W
c)
1.33 W
d)
12 W
18.
Has work been done on the punching bag by the glove?
a)
Yes, because the glove provided a force that moved the bag through a distance.
b)
Yes, because the bag moved in a different direction than the force that was applied.
c)
No, because the bag was moved both forward and backward.
d)
No, because the bag did not move when it was struck by the glove.
19.
A car manufacturer reduces the mass of a car by 250kg. If the new design is otherwise identical to the old design, how will the new car compare to the old car?
a)
It will need less force to move.
b)
It will release more gas emissions.
c)
It will require more fuel to operate.
d)
It will have a greater gravitational attraction to the road.
20.
A device that uses a combination of two or more simple machines is called a ___.
a)
compound machine
b)
double machine
c)
compound device
d)
efficient machine
21.
Referring to the picture, which part of the wheel barrow represents the fulcrum? (hint: Where does it pivot?)
a)
the wheel
b)
the handle
c)
the load
d)
the is no fulcrum on a wheel barrow
22.
In the picture above, the input force is ___. (Hint: Its the force you apply to the simple machine)
a)
the force the boy applies to the handles
b)
the force of the load in the wheel barrow
c)
the force of friction between the wheel and the ground
d)
the force of gravity on the wheel barrow
23.
The ramp on the back of a moving van is an example of what type of simple machine?
a)
an inclined plane
b)
a wedge
c)
a pulley
d)
a wheel and axle
24.
Which simple machine is used in the picture?
a)
Lever
b)
Wedge
c)
Inclined plane
d)
Pulley
25.
Pulleys are one of the six simple machines that make work easier for people. Which of these statements is true about pulleys?
a)
Pulleys change the direction of a force that is exerted.
b)
Pulleys decrease the amount of work that is done.
c)
Pulleys increase the amount of work done.
d)
Pulleys increase the amount of input force required to move an object.
26.
Pulleys are one of the six simple machines that make work easier for people. Which of these statements is true about pulleys?
a)
Pulleys reduce the amount of input force needed to move an object.
b)
Pulleys decrease the amount of work that is done.
c)
Pulleys decrease the distance over which the input force is exerted.
d)
Pulleys increase the amount of input force required to move an object.
27.
Which answer describes how simple machines change human work?
a)
They make it easier.
b)
They make it less important.
c)
They make it harder
d)
They make it more important.
28.
What simple machine is extremely useful for lifting objects from one level to another?
a)
pulley
b)
wheel and axle
c)
wedge
d)
inclined plane
29.
What type of simple machine is shown in the picture below?
a)
wheel and axle
b)
lever
c)
pulley
d)
wedge
30.
Look at the diagram of a lever lifting a rock. As the handle is made LONGER, what will change?
a)
It will be easier to lift the rock.
b)
It will be harder to lift the rock.
c)
Nothing will change.
d)
There is no way to predict what will happen.
31.
Your mother asks you to lift and carry a basket of clothes to the laundry room. In doing this, you have used your arms as levers. Which statement explains how the movement of your arms works as levers?
a)
The basket of clothes was the load, the elbows were the fulcrum, and the effort was supplied by your muscles.
b)
The muscles in your arm were the fulcrum, the elbows supplied the effort, and the load was the basket of clothes.
c)
The fulcrum was the basket of clothes, the load was the elbows, and the effort was supplied by your muscles.
d)
The basket of clothes was the fulcrum, the load was the elbows, and the effort was supplied by your muscles.
32.
Which is NOT an example of a wheel and axle?
a)
flagpole
b)
doorknob
c)
steering wheel
d)
ferris wheel
33.
Which simple machine is an inclined plane wrapped around a pole or rod and is used to hold things together?
a)
screw
b)
lever
c)
pulley
d)
wedge
34.
Which simple machine converts motion in one direction into a splitting motion that acts at right angles to the blade?
a)
a wedge
b)
a lever
c)
a pulley
d)
a wheel and axle
35.
Which of the following is true about simple machines?
a)
They cannot supply the energy necessary to apply a force to an object.
b)
They cannot increase the force applied to an object.
c)
They cannot increase the distance over which force is applied to an object.
d)
They cannot change the direction in which force is applied to an object.
36.
Which of the following is a compound machine?
a)
can opener
b)
hockey stick
c)
nut cracker
d)
ramp
37.
Which is the BEST description of a compound machine?
a)
two or more simple machines, combined to work together
b)
a machine with a high mechanical advantage
c)
a machine that has an energy source such as a motor or an engine
d)
a machine that has many parts
38.
Which of the following is NOT a simple machine?
a)
wing
b)
lever
c)
screw
d)
pulley
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