Download Work, Power, and Energy Assessment

Work, Power, and Energy
Assessment
HMS 2015
Which would involve doing the most
work?
Which would involve doing the most
work?
Which person has the most power?
Which person has the most power?
What is the ability to do work or
cause change?
What is the ability to do work or
cause change?
ENERGY
What is the energy an object has
due to motion?
What is the energy an object has
due to motion?
Kinetic Energy
Which ball has more kinetic energy?
Ball
Masses
Velocity
A
20 kg
10 m/s
B
25 kg
10 m/s
Which ball has more kinetic energy?
Ball
Masses
Velocity
A
20 kg
10 m/s
B
25 kg
10 m/s
Which ball has more kinetic energy?
Ball
Masses
Velocity
C
30 kg
40 m/s
D
30 kg
32 m/s
Which ball has more kinetic energy?
Ball
Masses
Velocity
C
30 kg
40 m/s
D
30 kg
32 m/s
What is energy stored within an
object?
What is energy stored within an
object?
Potential Energy
Which 2 factors does gravitational
potential energy depend on?
Which 2 factors does gravitational
potential energy depend on?
Weight and Height
Pulling back the string of a bow is an
example of what type of energy?
Pulling back the string of a bow is an
example of what type of energy?
Elastic Potential Energy
Using the image below, explain
why one of the skiers has greater
gravitational potential energy?
Using the image below, explain
why one of the skiers has greater
gravitational potential energy?
The one on the right
has more gravitational
potential energy because
he weighs more
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy is this?
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Mechanical
Electromagnetic
Electrical
Thermal
Chemical
Which type of energy occurs
continuously in the sun?
Which type of energy occurs
continuously in the sun?
Nuclear Energy
What do you call the change from
one form of energy to another?
What do you call the change from
one form of energy to another?
Energy Transformation
Lighting a match requires multiple
energy transformations?
T or F
Lighting a match requires multiple
energy transformations?
T
Which law states that energy
cannot be created nor destroyed?
Which law states that energy
cannot be created nor destroyed?
Law of Energy Conservation
Why, when you drop a golf ball,
will it not bounce up to the same
height it was dropped from?
Why, when you drop a golf ball,
will it not bounce up to the same
height it was dropped from?
• Some energy is transformed into thermal energy
• Some energy is transformed into sound energy
What is a material that forms over
millions of years from the remains
of ancient plants and animals?
What is a material that forms over
millions of years from the remains
of ancient plants and animals?
A fossil fuel
Which are fossil fuels?
Which are fossil fuels?
You are at Mt. Olympus and riding the roller coaster,
Pegasus. The roller coaster pulls you up a distance
of 50 m while exerting a force of 8000 N, how much
work is being done by the roller coaster?
You are at Mt. Olympus and riding the roller coaster,
Pegasus. The roller coaster pulls you up a distance
of 50 m while exerting a force of 8000 N, how much
work is being done by the roller coaster?
W=F * D
W=8000 * 50
400,000 J
You are dog sitting your neighbor’s pet this summer,
and are pulling Fido in a wagon. You are exerting a
force of 250 N. You move the wagon a distance of
40 m over 70 seconds. How much power was
exerted?
You are dog sitting your neighbor’s pet this summer,
and are pulling Fido in a wagon. You are exerting a
force of 250 N. You move the wagon a distance of
40 m over 70 seconds. How much power was
exerted?
P=w/t
P= (f * D)/t
P= (250 * 40)/70
P=10000/70
142.86 W
Randy Moss is timed at running the 100 meter dash
(when he was 14 years old) at a speed of 10.96 m/s
while weighing 36 kg. What was his kinetic energy
during the race?
Randy Moss is timed at running the 100 meter dash
(when he was 14 years old) at a speed of 10.96 m/s
while weighing 36 kg. What was his kinetic energy
during the race?
KE= ½ * m * v2
KE=1/2 * 36 * 10.962
KE= .5 * 36 * 120.1216
2162.1888 J
Jeff Brushie, 1991 World Cup Halfpipe Champion is
at the top of a snow covered halfpipe that is 6.7 m
tall. He has a weight of 550 N. What is his
gravitational potential energy?
Jeff Brushie, 1991 World Cup Halfpipe Champion is
at the top of a snow covered halfpipe that is 6.7 m
tall. He has a weight of 550 N. What is his
gravitational potential energy?
GPE=w * h
GPE=550 * 6.7
3685 J
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