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WorksheetsEnergy, Power, and Conservation of Energy
Total questions: 34
Worksheet time: 24mins
You do work only if an object
is large.
takes effort to hold up.
has force applied to it.
moves a distance as force is being applied.
If you double the force applied to an object, but move the object the same distance, the work you did
stayed the same, but was more difficult.
doubled.
was cut in half.
increased four times, because you have to square the force.
If you need to lift an object but it is too heavy, mechanical advantage shows you that you should
give up.
get stronger.
increase the distance over which you do work.
call someone else to help you.
If you used a pulley system that lifted a 200N object four times slower than you pulled on the rope, how much force were you applying?
50N
100N
200N
800N
Work causes a change in
weight.
inertia.
velocity.
energy.
In the F vs. d graph, what does the shaded area under
the plot represent?
a change in momentum
a change in posit
a change in energy
a change in impulse
The F vs. d graph shows the force applied to a marble by a slingshot. How much kinetic energy did the slingshot give to the marble?
500J
250J
40J
80J
Which of the following is NOT an example of potential energy?
logs that are ready to burn
a bicyclist cruising on a flat road
a sling shot ready to fire a marble
a boulder ready to fall off a cliff
Which of the following is NOT an example of kinetic energy?
a baseball flying from the picture to the catcher
a bicyclist cruising on a flat road
a sling shot ready to fire a marble
a piston in a car’s engine after the cylinder fired
Which of the following is NOT a type of potential energy?
nuclear potential energy
electrical potential energy
rotational potential energy
elastic potential energy
Which of the following is NOT a type of kinetic energy?
nuclear kinetic energy
translational kinetic energy
rotational kinetic energy
thermal kinetic energy
Power is which of the following two?
the rate of translation
the rate of delivering energy
the rate of doing work
the rate of rotation
What is the symbol for power?
W
U
P
K
What is the unit for power?
J
Js
W
N/m
Which two statements about power are true?
The faster work is being done, more power is being applied.
If you have a greater power output, the applied force must be larger.
If the power is increased, the amount of energy delivered or used is larger.
If the power is increased, the amount of time energy is delivered or used is longer.
A motor does 1000J of work in 5 seconds, what is the motor’s power output?
100W
200W
500W
5000W
A 40W light bulb is left on for an hour (3600s). How much energy did it use?
40J
90J
144,000J
3600J
Energy when delivered to your home isn’t measured in Joules, it’s measured in
Mega-Watts (MW).
Kilo-Joules (kJ).
Kilo-Joule hours (kJ-hr).
Kilo-Watt hours (kW-hr).
Energy is
power times distance.
power times time.
work times time.
work times distance.
What requires more work, lifting a 10kg load a vertical distance of 2m or lifting a 5kg load a distance of 4m?
Lifting a 10kg load a vertical distance of 2m.
Lifting a 5kg load a distance of 4m.
They are the same.
There isn’t enough information because the force isn’t given.
Suppose a girl riding a bike has 2000J of kinetic energy. When she moves twice the speed, what would her kinetic energy be?
2,000J
4,000J
6,000J
8,000J
An object with momentum must have energy, but an object with energy doesn’t have to have momentum.
True
False
The total energy in a closed and isolated system
remains the same.
decreases, because everything stops eventually.
increases in time as it gains strength.
it depends on the particular system being studied and how much potential energy is left.
Where in the swing of the pendulum shown is the
potential energy the largest? It may be in more than one place!
A
B
C
D
E
Where in the swing of the pendulum shown is the
kinetic energy the largest? It may be in more than one place!
A
B
C
D
E
If the total energy at location A is 60J,
what is the total energy at location B?
0J
30J
60J
120J
If the total energy at location A is 60J,
what is the total energy at location C?
0J
30J
60J
120J
Where does the bowling ball have the most energy?
As the bowling ball is about to hit Dan’s foot.
Half way down on its fall toward Dan’s foot.
At the highest point before it is released to fall.
It has the same energy from the time it is released until it to hits Dan’s foot.
Which equation/description best fits location 1 on the roller coaster?
E=U+K
E=0J
E=U
E=K
Work is giving the system energy.
Which equation/description best fits location 2 on the roller coaster?
E=U+K
E=0J
E=U
E=K
Work is giving the system energy.
Which equation/description best fits location 3 on the roller coaster?
E=U+K
E=0J
E=U
E=K
Work is giving the system energy.
Which equation/description best fits location 4 on the roller coaster?
E=U+K
E=0J
E=U
E=K
Work is giving the system energy.
Which equation/description best fits location 5 on the roller coaster?
E=U+K
E=0J
E=U
E=K
Work is giving the system energy.
Which equation/description best fits location 6 on the roller coaster?
E=U+K
E=0J
E=U
E=K
Work is giving the system energy.
