WorksheetsWork Energy Power Review
Total questions: 31
Worksheet time: 26mins
Name
Class
Date
1.
The unit used to measure work is the
a)
Watt
b)
Newton
c)
Joule
d)
meter
2.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
3.
The efficiency of a machine can be increased by reducing __________________________.
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
4.
The unit used to measure power is the
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
5.
Which of the following is the best example of work being done.
a)
doing homework
b)
lifting a box
c)
pushing a stationary box
d)
holding a box
6.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
7.
A 5000N block is lifted 10 m. How much work was done against gravity to lift it?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
8.
A 5000N block is lifted 10 m. How much gravitational potential energy will it have?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
9.
Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
10.
Force is a _____ or _______
a)
simple complex
b)
push pull
c)
up down
d)
in out
11.
How much work is done when the engine produces 350 N of force to move a car 5 m?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
12.
In which of these cases is work being done?
a)
A student sleeps
b)
A student pushes a locked door that does not move
c)
a student carries his chair into another room
d)
A student sits on the carpet
13.
Would it be easier to move a box of the same mass up a ramp that was long and gradual or short and steep?
a)
long and gradual
b)
short and steep
14.
What is the unit for mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
15.
The amount of work done in a certain amount of time is known as
a)
work
b)
effort force
c)
resistance force
d)
power
16.
How much power is required for a tractor that drags a plow with a force of 500 N over distance of 10 meters in 20 seconds?
a)
250 Watts
b)
250 Joules
c)
100,000 Watts
d)
100,000 Joules
17.
The more POWER you use to move an object, the more work you do.
a)
True
b)
False
18.
Work is done on an object when the object moves in the SAME direction in which the force is applied.
a)
True
b)
False
19.
Which of the following can increase power?
a)
less force and more time
b)
more force and less time
c)
less time and less work
d)
more time and more work
20.
If someone does 70,000 J of work with a power of 14,000 watts, what is the amount of time it was done in?
a)
5 seconds
b)
50 seconds
c)
0.200 seconds
d)
980,000,000 seconds
21.
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
22.
If 150 Joules of work is needed to move a box 10 meters, what force was used?
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
23.
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
24.
What is the equation for power?
a)
P = Work/time
b)
P = Force/time
c)
P = time/distance
d)
P = Work * time
25.
How much work will be done when 800 Newtons of force moves an object distance of 20 meters?
a)
40 J
b)
1,600 J
c)
400 J
d)
16,000 J
26.
How much POWER results when 45,000 Joules of work done is completed in 90 seconds?
a)
50 watts
b)
500 watts
c)
5000 watts
d)
4,050,000 watts
27.
An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how energy is consumed (much work was done)?
a)
1,356,490 J
b)
1,356,480 J
c)
1,356,470 J
d)
1,356,460 J
28.
What is the definition of a joule?
a)
the product of distance and the force in the direction an object moves
b)
the SI unit of work, equal to 1 newton-meter
c)
the rate of doing work
d)
the SI unit of power, equal to one joule per second
29.
What is the definition of a watt?
a)
the product of distance and the force in the direction an object moves
b)
the SI unit of work, equal to 1 newton-meter
c)
the rate of doing work
d)
the SI unit of power, equal to one joule per second
30.
A conveyor applies a 20 N force to move a box 12 meters. If the power consumption of the conveyor is 60 watts, how long will it take to move the box?
a)
2 seconds
b)
10 seconds
c)
4 seconds
d)
6 seconds
31.
A crane lifts a box 15 meters in 45 seconds. If the crane consumes 600 watts of power to lift the box, how much does the box weigh?
a)
1800 Newtons
b)
200 Newtons
c)
300 Newtons
d)
900 Newtons
100 %
