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Welcome to Work/Energy/Power
JEOPARDY
Conservation of
Mechanical
energy
Work
Energy
Power
Work energy
Theorem
100
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200
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300
300
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400
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500
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500
Final Jeopardy Question
Work
100 pts
What is the Unit for
Work?
Back
Work
100 pts
Answer
The Joule
Back
Work
200 pts
The work required to lift a 500N
object up a height of 40 m?
Back
Work
200 pts
20,000J
Back
Work
300 pts
A person applies a force of 50 N to
do 600J of Work. How far has the
person moved the object?
Back
Work
300 pts
12 m
Back
Work
400pts
Santa pulls a load of toys with
an applied force of 4000N at an
angle of 60 degrees. If there is
1000N of resistance what is the
total work exerted on the toys
is Santa pulls them 200m?
Back
Work
400 pts
Answer
2.0 X 5 J
Back
Work 500 pts
Jack the body builder decides to bench press
550N. It takes him .3 s to lift the 550N
weight a distance of .5m. He holds it in place
for 4s and then gently for 3s lets the bar back
down to its starting position.
a. How much of the time was doing positive
work
b. How much of the time was doing negative
work
c. How much of the time was spent doing no
work
d. What was the total work done
Back
Work
500pts
Answer
a. .3s
b. 3s
c. 4s
d. Zero
Back
Energy
100pts
What is the unit for
energy?
Back
Energy
100 pts
The Joule
Back
Energy
200 pts
The type of energy resulting from an objects
position
Back
Energy
200pts
Answer
What is potential energy?
Back
Energy
300pts
The type of energy due to an
objects motion
Back
Energy
300 pts
What is kinetic energy?
Back
Energy
400 pts
Collisions in which kinetic
energy is conserved?
Back
Energy
400 pts
Answer
What are elastic
collisions?
Back
Energy
500 pts
A .05 kg bullet strikes a block of
wood with an initial velocity of
4m/s. What initial kinetic energy
does the bullet have as it enters
the wood.
Back
Energy
500 pts
Answer
.4J
Back
Power
100 pts
The unit for power
Back
Solar Cycle
100 pts
Answer
What is a Watt?
Back
Star Cycle
200pts
How much power does it take a 600N
person to climb to a height of 4m in 2min?
Back
Star Cycle
200pts
Answer
Two Watts
Back
Power
300pts
How much energy does a 500 kwatt
bulb use in one hour?
Back
Power
300pts
Answer
500 kwatt hr
Back
Your electric bill this
month is 30 dollars,
and you Pay $.03 per
kwatt hour.
How much energy
did you use? What
was the average
power usage?
Back
100 kwatt hr,
.138kwatts
Back
How much power is required
to keep an 600N object moving at a
constant 3m/s if the coefficient of
friction is .5?
Back
900 watts or .9 kwatts
Back
Energy is never created nor
destroyed just converted from
one form to another
Back
What is conservation of
energy?
Back
A trapeze artist swings from the top of a
platform to the other side, Describe the
change in mechanical energy at the
following positions
a. Top of platform
b. Bottom of swing
c. Top of final platform
Back
All potential
kinetic and potential
All potential
Back
What is the final speed of 5000
kg rollercoaster if it starts from
rest at a height of 500m and
ends at a height of 300m?
Back
62.6 m/s
Back
A 40 kg monkey jumps up a tree with a
velocity of 4m/s. How high will the
monkey jump?
Back
.4 m
Back
What type of forces
conserve mechanical energy?
Back
Conservative forces, forces
that do not loose heat.
Back
How much energy
will you get if you do
400 J of Work
Back
400 J
Back
How far will a 40kg object moving at
3m/s travel if a 20N force acts on it?
Back
9m
Back
Work equals the change
in kinetic energy
Back
What is the work energy
theorem?
Back
A bow is pulled back .3m with
an average force of 200N what is
the energy stored in the bow?
Back
60 joules
Back
An archer after providing 450J of
work on a bow releases it. What
is the velocity of the arrow if its
mass is 1kg?
Back
30 m/s
Back
When was the
internet developed?
Back
1960’s
Back