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WorksheetsWork, Power, & Machines Exam
Total questions: 35
Worksheet time: 21mins
A boy pushes on a parked car with a force of 200 N but is unable to move the car. How much work does the boy do on the car?
200 N
200 J
200 W
He does no work.
A weightlifter presses a 400 N weight 0.5 m over his head in just 2 seconds. What is the power of the weightlifter?
200 W
25 W
400 W
100 W
An inclined plane____.
changes the direction of the force only
changes the magnitude of the force only
changes the distance that the effort is applied
makes all effort disappear
The number of times a machine multiplies effort force is the machine’s _______.
mechanical advantage
efficiency
power
work
Which simple machine can help you raise an object?
an inclined plane
a pulley
a lever
all of the above
What happens when you apply a DOWNWARD force to the left side of the lever, as shown in this picture:
It causes the right side of the lever to apply an UPWARD force.
It causes the right side of the lever to apply a DOWNWARD force.
The force has no effect on the lever.
It breaks the fulcrum.
Which class of lever best represents the picture below?
first class
second class
third class
all of the above
Complete the statement. ________ is the ability to do work.
Energy
Force
Power
Mass
A large semi-truck is moving a house from one lot to another. The amount of force required to move the house horizontally a distance of 67.2 meters is 3,400 newtons. How much work will be done on the house?
50.60 J
228,480 J
3,467.2 J
0 J
Which of the following simple machines is an inclined plane wrapped around a cylinder?
(Image of a screw)
(Image of a screw)
(Image of an inclined plane)
(Image of an inclined plane)
(Image of a wheel and axle)
(Image of a wheel and axle)
(Image of a lever)
(Image of a lever)
Which of the following is NOT a simple machine?
Battery
Wheelbarrow
Pulley
Lever
If a machine has a mechanical advantage of 4, what does this mean?
The machine decreases the input force by 4 times
The machine increases the input force by 4 times
The machine uses 4 times more energy
The machine works 4 times faster
What is the unit of work in the International System of Units (SI)?
Meter
Newton
Joule
Watt
Directions: Find the missing component for each of the simple machines below. Wheel and axle diagram shows a large wheel labeled 15 m and a smaller axle. Given MA = 3. Radius of axle = ___
3 m
5 m
10 m
15 m
Directions: Find the missing component for each of the simple machines below. Pulley diagram shows a single pulley lifting a 60 N load with FE = 20 N. Mechanical Advantage = ___
2
3
20
60
Directions: Find the missing component for each of the simple machines below. Wheelbarrow diagram shows FR = 20 N and MA = 10. FE = ___
1 N
2 N
10 N
200 N
Directions: Find the missing component for each of the simple machines below. Pulley diagram shows a single pulley lifting a 60 N load with FE = 20 N. Mechanical Advantage = ___
2
3
20
60
Which simple machine is used to hold objects together or lift them by turning?
Lever
Screw
Inclined plane
Pulley
What is the main function of a wedge?
To change the direction of force
To split or cut objects
To lift objects
To measure force
If a ramp is made longer but the height stays the same, what happens to the effort force needed to move an object up the ramp?
It disappears
It increases
It decreases
It stays the same
Which simple machine is used to lift a flag on a flagpole?
Lever
Pulley
Inclined plane
Wedge
What is the main purpose of using a simple machine?
To make work easier
To increase the amount of work done
To use more energy
To decrease the distance moved
Which of the following is an example of a wheel and axle?
Hammer
Ramp
Door knob
Scissors
Compound machines consist of two or more simple machines combined together to make work easier and increase the mechanical advantage. What two simple machines are used in a wheelbarrow?
Wheel/ axle and a lever
Lever and a wedge
Wheel/ axle and a screw
Inclined plane and a lever
A drill bit would be an example of which type of simple machine?
Lever
Wedge
Incline plane
Screw
Energy is
how fast you do something.
the ability to do work.
confusing.
how fast you lift something.
Jane carries a 5 kg box and Lorie carries a 10 kg box up a set of stairs, who did more work?
Jane because his box was lighter.
Lorie because her box weighed more.
Can't tell.
You push a crate with a force of 100 N for 5 meters. How much work did you do?
500 J
100 J
50 J
5 J
Work is done only if
a force is applied.
the force applied causes the object's motion.
an object is in motion.
If you run up the stairs slower you will
do more work.
do less work.
generate more power.
generate less power.
In which case is work being done?
A
B
C
D
If a 74 kg racer took 798 s to climb the 320 m, how power did she developed?
291 Watts
281 Watts
317 Watts
313 Watts
A construction worker uses a pulley and a rope to raise an 85 kg person to a height of 2 m in 6 s. How much power is he supplying?
1,670 W
833 W
278 W
417 W
