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WorksheetsEnergy and Power Test Review
Total questions: 20
Worksheet time: 52mins
Name
Class
Date
1.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
2.
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
3.
What is the kinetic energy of a 9 kg book that has a speed of 4 m/s?
a)
18 J
b)
36 J
c)
72 J
d)
144 J
4.
What is the potential energy done in lifting a 50 kg barbell 6 m above the floor?
a)
150 J
b)
300 J
c)
1470 J
d)
2940 J
5.
What is the average power generated by Peter Quill aka Star Lord (m = 100 kg) running up a flight of stairs rising vertically 6 .0 m in 5.0 s?
a)
0.03 W
b)
817 W
c)
1176 W
d)
1993 W
6.
Groot rescues Rocket from the bottom of a deep pit. Groot expends 1000 J of energy lifting Rocket who has a mass of 50 kg out of the pit. How deep is the pit?
a)
0.5 m
b)
2 m
c)
4 m
d)
10 m
7.
Swimmers at a water park have a choice of two frictionless water slides, as shown in the figure. Although both slides drop over the same height h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. How does the speed v1 of a swimmer reaching the bottom of slide 1 compare with v2, the speed of a swimmer reaching the end of slide 2?
a)
v1 > v2
b)
v1 < v2
c)
v1 = v2
d)
The heavier swimmer will reach the bottom with more speed
8.
A bike rider approaches a hill at a speed of 5.5 m/s. The combined mass of the bike and rider is 87kg. Find the initial kinetic energy of the system.
The rider coasts up the hill. Ignoring friction, at what height will the bike come to rest?
The rider coasts up the hill. Ignoring friction, at what height will the bike come to rest?
a)
1316J, 1.5m
b)
2316J, 2.5m
c)
1457J, 3.5m
d)
none of the above
9.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
10.
At which point(s) on the roller coaster is the kinetic energy at its maximum?
a)
A
b)
B
c)
C
d)
D
11.
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
12.
When my velocity triples, my kinetic energy increases by ______ times.
a)
9
b)
3
c)
1.5
d)
4.5
13.
A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What is the amount of work in joules needed to accelerate the box?
a)
50.0
b)
60.0
c)
20.0
d)
45.0
14.
True or false: when the distance an object moves is zero the work done on the object is also zero.
a)
True
b)
False
15.
Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 9.7J?
a)
9.81J
b)
10,000J
c)
9.7J
d)
9,990.3J
16.
How much work is done on a vacuum cleaner pulled 3 m by a force of 50 N at an angle of 30-degrees above the horizontal?
a)
50J
b)
80J
c)
130J
d)
240J
17.
The work-kinetic energy theorem says that the net work done by all the forces acting on an object is equal to the change in the object's _____.
a)
mechanical energy
b)
work
c)
momentum
d)
kinetic energy
18.
What is the weight of an object if 75 J of work is done to lift it uniformly 6.0 m
a)
13 N
b)
450 N
c)
1.3 kg
d)
130 kg
19.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________.
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
20.
An electric motor develops 65 kW of power as it lifts a loaded elevator 17 m in 10 s. How much force does the motor exert?
a)
38,235 N
b)
38.24 N
c)
11050 N
d)
110500 N
e)
110.5 N
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