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WorksheetsC.O.E. and Thermodynamics
Total questions: 39
Worksheet time: 38mins
Work and energy have the same units, Joules.
True
False
Kinetic energy depends on an object’s height above a reference point.
True
False
Heat is NOT a form of energy, just the transfer of thermal energy.
True
False
James Watt became very wealthy after inventing the light bulb.
True
False
James Prescott Joule studied the concept of heat to help his family’s brewery business.
True
False
Work causes a change in
speed
acceleration
force
energy
Temperature is a measure of
potential energy
translational kinetic energy
thermal energy
rotational kinetic energy
A 2.0 kg mass is moving with a speed of 3.0 m/s. What is the kinetic energy of the mass?
3.0J
6.0J
9.0J
12J
A high diver steps off a diving platform that is 10 meters above the water. During the fall there will be a decrease in the diver’s _____________ . (neglect air resistance)
potential energy
kinetic energy
total mechanical energy
momentum
An 80.0 kg firefighter is on a ladder 10.0 meters above the ground. When the firefighter descends to 5.00 meters above the ground, the firefighter's gravitational potential energy will decrease by _____________.
400J
800J
3920J
7840J
If the environment does work on a system,
the system's energy can only increase.
the system's energy can only decrease.
the system's energy still remains constant.
the system's energy will change.
When a force is exerted on an object, work is done only if the object
stays at rest.
is heavy.
moves.
has no momentum initially.
An engine has an input of energy of 1000J and does 600J of work. Which of the following is the heat loss?
400J
1600J
1.67J
0.6J
In which state of matter are atoms held together the most?
liquid
solid
gas
plasma
If something is hot, the atoms in it are
moving fast.
moving slowly.
not moving at all.
frustrated.
When a gas is heated in a closed container, the internal pressure increases. Which best describes the reason for the increase in pressure?
The average kinetic energy of the gas molecules decreases.
The potential energy of the gas increases.
The average kinetic energy of the gas increases.
The potential energy of the gas decreases.
In which of the following systems is the entropy decreasing?
Cleaning your bedroom
Adding cold milk to a cup of hot coffee
Smashing a coffee cup with a hammer
Stomping on a sand castle
Which of these statements best explains the difference between work and power?
Work is a vector and power is a not a vector.
Work decreases the energy of an object and power increases it.
Work is the distance an object travels and power is the energy the object gains.
Work is the change in energy and power is how fast that energy change happens.
Select the best explanation for the following statement:
“A bowling ball does not need to be moving to have energy.”
The bowling ball does not have energy unless it is moving.
The bowling ball can have potential energy, which depends on position, not motion.
The bowling ball can have kinetic energy, which depends on position, not motion.
The bowling ball only has energy if it lifted above the ground.
A person pushes a box with a constant force of 920N. It moves a total of 6.0m. How much work did the person do?
153J
16,560J
5,520J
54, 096J
A machine can do 200J of work over a time period of 4.0s. What power did this machine generate?
0.02W
5.0W
50W
800W
At point A, how much gravitational potential energy does the pendulum bob have?
2J
0.2J
0J
5J
At point C, how much gravitational potential energy does the pendulum bob have?
2J
0.2J
0J
5J
Where does the pendulum bob have maximum potential energy: A, B, C, D, E? May have more than one answer - choose all that apply.
A
B
C
D
E
Where does the pendulum bob have maximum kinetic energy: A, B, C, D, E? May have more than one answer - choose all that apply.
A
B
C
D
E
Where does the pendulum bob have equal amounts of potential and kinetic energy: A, B, C, D, E? May have more than one answer - choose all that apply.
A
B
C
D
E
The illustration shows a bouncing ball tracked in time. What is the best explanation for h2 being less than h1?
The ball has more translational kinetic energy after hitting the ground, so it has less potential energy.
When the ball hits the ground, some of its energy goes into heat and thermal internal energy, so less turns back in to potential energy.
When the ball hits the ground, the ball loses some mass, so less mass creates less potential energy when it goes back up.
Entropy in the system decreases, which also causes the potential energy to decrease.
There is friction and air resistance present in the rollercoaster system. At location 5, choose all of the types of energy present in the system.
Translational kinetic energy
Rotational kinetic energy
Gravitational potential energy
Thermal kinetic energy
There is friction and air resistance present in the rollercoaster system. Which equation/process best describes location 5.
E=U+K
E=U
E=U+K+W
E=K
E=K+W
There is friction and air resistance present in the rollercoaster system. Which equation/process best describes location 4.
E=U+K
E=U
E=U+K+W
E=K
E=K+W
There is friction and air resistance present in the rollercoaster system. Which equation/process best describes location 3.
E=U+K
E=U
E=U+K+W
E=K
E=K+W
Looking at the picture, which heating shows conduction?
A
B
C
That's not a form of heating!
Looking at the picture, which heating shows convection?
A
B
C
That's not a form of heating!
Looking at the picture, which heating shows radiation?
A
B
C
That's not a form of heating!
Looking at the picture, which heating shows excitation heating?
A
B
C
That's not a form of heating!
Looking at the equation of the ideal gas law, if the temperature increases and the volume stays the same, what happens to the pressure?
Increases
Decreases
Increases twice as much
Stays the same
Looking at the equation of the ideal gas law, why does a filled balloon expand when the air inside it warms up?
The air molecules multiply by n when they get heated and they need more room.
The gas constant R increases at the temperature increases and that increases the volume.
As the temperature increases, the pressure decreases inside the balloon, so the volume needs to increase more.
As the temperature increases, the molecules inside move faster, collide more, and increase the pressure, which causes the balloon to expand.
A heat engine is more efficient if
it does more work when you have a larger input heat.
it does more work with the same input heat.
it has a greater output heat than the work.
it has the same input, but greater output heat.
What is the best explanation of why a swing won’t swing forever?
You need to keep pushing it to give it energy to overcome gravity.
Because the swing’s entropy decreases at it goes back and forth.
Because the potential energy can never be the same as the kinetic energy in a system.
Air molecules and friction at the swing’s pivot both take energy out of the swing system.
