TOPIC Energy AIM How can energy be different
TOPIC: Energy AIM: How can energy be different?
2 Types 1. Kinetic Energy Of Energy energy of motion
Kinetic Energy facts: The faster/greater the velocity of an object the greater the Kinetic energy of the object in motion
The larger/greater the mass of an object the greater the Kinetic energy the object in motion
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Example m= 2 kg v= 2 m/s KE = ? KE = mv 2 2 KE = 2 x 2 2 2 KE = 2 x 4 2 KE = 4 J
Example m= 10 kg v= 3 m/s KE = ? KE = mv 2 2 2 3 KE = 10 x 2 KE = 10 x 9 2 KE = 45 J
Example m= 5 kg v= 1 m/s KE = ? KE = mv 2 2 2 1 KE = 5 x 2 KE = 5 x 1 2 KE = 2. 5 J
2. Potential Energy stored energy that is not moving/ not working
Examples: 1. Stretched rubber band posseses a lot of Potential Energy When you let the rubber band go the PE is released
2. Unlit match the PE is stored until the match is lit
The massive ball of a demolition machine and the stretched bow possess stored energy of position = Potential Energy
REVIEW: KINETIC OR POTENTIAL ENRGY?
Gravitational Potential Energy The potential energy that depends on height The greater the weight of the object the greater the Grav. Pot. Ener. will be
The greater the height of the object the greater the Grav. Pot. Ener. will be
Example: Person on a 3 m high diving board has more GPE than person on 1 m high board
GPE = weight x height Example: What is the GPE of a 780 N diver on a diving board that is 10 m high? • GPE = w x h • GPE = 780 N x 10 m • GPE = 7800 J
Example: What is the GPE of a 320 N diver on a diving board that is 5 m high? GPE = w x h GPE = 320 N x 5 m GPE = 1600 J
Example: Who has a higher GPE? A) 300 N diver on a 3 m diving board B) 75 N painter on an 8 m ladder C) 500 N diver on a 2 m diving board
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
Do Now: If a 70 N squirrel is on a branch that is 4 meters above the ground, what is the gravitational potential energy? Show all work!!!
TOPIC: Energy AIM: How does energy change from one type to another?
• Change of energy from Energy 1 type to another Conversion • KE PE • PE KE
Example: Throwing a ball into the air KE PE V = 0 m/s KE = 0 J PE = max V V PE KE V V = 0 m/s KE = 0 J PE = max PE KE
V = 0 m/s KE = 0 J PE = max V = 0 m/s Spe e up ding PE KE V = max KE = max PE = 0 J g n i w Slo n w PE do E K KE = 0 J PE = max
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.
On the platform: KE = 0 Joules PE = max During the jump: KE is increasing PE is decreasing PE KE In the water: KE = 0 Joules PE = max
- Slides: 36