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Physics 2nd Q Exam
Test Description: Energy
Instructions: Answer all questions to get your test result.
1) A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow?
A
10J
B
55J
C
250J
D
1250J
2) Work is done when
A
force is zero
B
the force and displacement are perpendicular.
C
the displacement is zero.
D
the displacement is not zero.
3) In which of the following scenarios is NO net work done?
A
A car decelerates as it travels up a hill.
B
A car accelerates down a hill.
C
A car travels at constant speed on a flat road.
D
A car decelerates on a flat road.
4) A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60° below horizontal. How much work does the child do on the balloon?
A
45J
B
12J
C
6.0J
D
10J
5) A 70.0kg man bungee jumps off a bridge, and the bungee cord stretches 29.0m. If the spring constant of the bungee cord is 71.8N/m, what is the elastic potential energy of the jumper?
A
3.02x10^4J
B
254J
C
1040J
D
1.99x10^4J
6) Which of the following energy forms is associated with an object in motion?
A
elastic energy
B
Kinetic energy
C
nonmechanical energy
D
potential energy
7) What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?
A
108J
B
54.0J
C
87.0J
D
216J
8) If friction is the only force acting on an object during a given physical process, which of the following assumptions can be made in regard to the object’s kinetic energy?
A
The kinetic energy remains constant.
B
The kinetic energy decreases and then increases.
C
kinetic energy decreases
D
The kinetic energy increases.
9) What is the potential energy of a 2.6 kg mass 3.5 m above the ground?
A
89J
B
9.1J
C
0.93J
D
16J
10) Which of the following is a true statement about the conservation of energy?
A
Total energy is always conserved.
B
elastic potential is conserved
C
kinetic energy is conserved
D
gravitational potential energy is conserved
11) Which of the following is the rate at which work is done?
A
kinetic energy
B
potential energy
C
power
D
mechanical energy
12) What is the average power supplied by a person with a weight of 590 N who is running up a flight of stairs a vertical distance of 4.0 m in 4.2 s?
A
670W
B
240W
C
57W
D
560W
13) A more powerful motor can do (think of definition of work)
A
the same work in a longer time interval.
B
less work in a longer time interval.
C
the same work in a shorter time interval.
D
more work in a longer time interval.
14) Energy that is stored due to an object's position above the ground is known as
A
gravitational potential energy
B
kinetic energy
C
mechanical energy
D
elastic potential energy
15) Unit for energy is the
A
kg*m/s
B
P (power)
C
W (watt)
D
J (joule)
16) An apple would have the highest gravitational potential energy when it was
A
when it is at its highest point above the ground
B
right before hitting the ground during a fall
C
when it is sitting on the ground
D
halfway through a fall
17) The unit for work is
A
J Joule
B
m meter
C
N newton
D
W watt
18) Gravitational force vectors are in which direction in a Free body diagram?
A
left
B
Down
C
right
D
Up
19) Mechanical energy is
A
only kinetic energy in a system
B
only potential energy in a system
C
The total kinetic and potential energy in a system
D
its own type of energy
20) If the mechanical energy in a system is 100J and the potential energy is 20J, how much kinetic energy is in the system?
A
80J
B
20J
C
100J
D
120J
*select an answer for all questions
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