TOPIC: Energy AIM: How can energy be different?. 2 Types Of Energy 1. Kinetic Energy energy of...
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Transcript of TOPIC: Energy AIM: How can energy be different?. 2 Types Of Energy 1. Kinetic Energy energy of...
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TOPIC: EnergyAIM: How can energy be different?
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2 TypesOf Energy
1. Kinetic Energy energy of motion
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Kinetic Energy facts:
The faster/greater the velocity of an object the greater the Kinetic energy of the object in motion
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The larger/greater the mass of an object the greater the Kinetic energy the object in motion
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2
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Examplem= 2 kgv= 2m/s KE = ?
KE = mv2
2
KE = 2 x 22
2KE = 2 x 4 2KE = 4 J
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Examplem= 10kgv= 3m/s KE = ?
KE = mv2
2
KE = 10 x 32
2KE = 10 x 9 2KE = 45 J
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Examplem= 5kgv= 1m/s
KE = ?
KE = mv2
2
KE = 5 x 12
2KE = 5 x 1 2KE = 2.5 J
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2.Potential Energy stored energy that is not moving/ not working
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Examples:1. Stretched rubber band posseses a lot of Potential Energy
When you let the rubber band go the PE is released
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2. Unlit match the PE is stored until the match is lit
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The massive ball of a demolition machine and the stretched bow
possess stored energy of position = Potential Energy
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REVIEW:
KINETIC OR
POTENTIAL ENRGY?
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GravitationalPotential Energy
The potential energy that depends on height
The greater the weight of the object the greater the Grav. Pot. Ener. will be
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The greater the height of the object the greater the Grav. Pot. Ener. will be
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Example: Person on a 3m high diving
board has more GPE than person on 1m high board
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GPE = weight x heightExample:What is the GPE of a 780 N diver on a diving board that is 10 m high?
•GPE = w x h•GPE = 780N x 10m•GPE = 7800 J
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Example:What is the GPE of a 320 N diver on
a diving board that is 5 m high?
GPE = w x h
GPE = 320N x 5m
GPE = 1600 J
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Example:Who has a higher GPE?
A) 300N diver on a 3m diving board
B) 75N painter on an 8m ladder
C) 500N diver on a 2m diving board
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Date # Assignment
Mon 11/30 9 Textbook page 133 # 1,2,3,5,6,7
Tues 12/1 10 Textbook page 493 # 1,2,3,5
Wed 12/2 11 Textbook page 500 # 3,4 page 506 # 2
Thurs 12/3
TEST
Fri 12/4
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Do Now:If a 70N squirrel is on a branch that is 4 meters above the ground, what is the gravitational potential energy? Show all work!!!
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TOPIC: EnergyAIM: How does energy change from one type to another?
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EnergyConversion
•Change of energy from 1 type to another
•KE PE •PE KE
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Example: Throwing a ball into the air
V = 0 m/s
PE KE V
V
KE PE
V = 0 m/s
V PE KE
PE = maxKE = 0 J
PE = maxKE = 0J
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KE = 0 J
KE = max
PE = max PE =
max
PE = 0 J
Speeding upSlowing
down
V = 0m/s
V = 0m/s
V = max
KE = 0 JPE KE KE PE
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As the car loses height, it gains speed. PE is changed into KE. The sum of the KE and PE is constant. It never changes.
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On the platform:
PE = maxKE = 0 Joules
During the jump:KE is increasingPE is decreasing
In the water:KE = 0 JoulesPE = max
http://www.youtube.com/watch?v=vl4g7T5gw1M
PE KE