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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
1250J
D
250J
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 on a flat road.
B
A car decelerates as it travels up a hill.
C
A car travels at constant speed on a flat road.
D
A car accelerates down a hill.
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
12J
B
10J
C
45J
D
6.0J
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
1040J
B
3.02x10^4J
C
254J
D
1.99x10^4J
6) Which of the following energy forms is associated with an object in motion?
A
nonmechanical energy
B
elastic energy
C
Kinetic 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
87.0J
C
54.0J
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 increases.
B
kinetic energy decreases
C
The kinetic energy decreases and then increases.
D
The kinetic energy remains constant.
9) What is the potential energy of a 2.6 kg mass 3.5 m above the ground?
A
16J
B
0.93J
C
89J
D
9.1J
10) Which of the following is a true statement about the conservation of energy?
A
gravitational potential energy is conserved
B
elastic potential is conserved
C
kinetic energy is conserved
D
Total energy is always conserved.
11) Which of the following is the rate at which work is done?
A
potential energy
B
kinetic 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
57W
B
560W
C
240W
D
670W
13) A more powerful motor can do (think of definition of work)
A
less work in a longer time interval.
B
more work in a longer time interval.
C
the same work in a longer time interval.
D
the same work in a shorter time interval.
14) Energy that is stored due to an object's position above the ground is known as
A
elastic potential energy
B
mechanical energy
C
kinetic energy
D
gravitational potential energy
15) Unit for energy is the
A
W (watt)
B
P (power)
C
J (joule)
D
kg*m/s
16) An apple would have the highest gravitational potential energy when it was
A
halfway through a fall
B
when it is at its highest point above the ground
C
right before hitting the ground during a fall
D
when it is sitting on the ground
17) The unit for work is
A
W watt
B
m meter
C
J Joule
D
N newton
18) Gravitational force vectors are in which direction in a Free body diagram?
A
Up
B
Down
C
left
D
right
19) Mechanical energy is
A
The total kinetic and potential energy in a system
B
only potential energy in a system
C
its own type of energy
D
only kinetic energy in a system
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
20J
B
100J
C
120J
D
80J
*select an answer for all questions
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