Energy 3

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Information about Energy 3

Published on March 7, 2008

Author: zglazenburg

Source: slideshare.net

Adventures of the Energy Boys! KE, GPE, EPE

KENETIC ENERGY BOY WITH HIS SUPER SPEED HE GET HIS ENERGY BY TRAVELING AT HIGH VELOCITIES AND INCREASING HIS MASS

GRAVITATIONAL POTENTIAL ENERGY GIRL WITH HER ABILITY TO CHANGE HEIGHTS HER ENERGY INCREASES AS HER HEIGHT OR MASS IS INCREASED

ELASTIC POTENTIAL ENERGY BOY ALTHOUGH HE MAY BE A TAD PORTLY HE CAN STRETCH OR COMPRESS HIS BODY (AND STOMACH) AND GAINS ENERGY FROM STRETCHING OR COMPRESSING HIS SPRING-LIKE BODY

Q MAN GIVES ENERGY TO A SYSTEM OUT OF THE GOODNESS OF HIS HEART!

EVIL Q MAN! (Q MAN’S EVIL TWIN!) GAINS ENERGY BY TAKING ENERGY AWAY FROM OTHERS! LIKES TO CREATE FRICTION.

BY THEMSELVES THEY ARE STRONG: BUT WHEN THEY COMBINE… E T = PE S + PE g + KE + Q

TODAY’S EPISODE: WHEN SUPER EVIL ENERGY MAN ATTACKS!

Oh no! Its Super Evil Energy Man! Run!

Part One: The Roller Coaster Quick! Transfer all your energy to me!

Part One: The Roller Coaster I’ll get you now that I have all the energy E T = Pe g

Part One: The Roller Coaster Woah!

Part One: The Roller Coaster Okay I guess we’re going to share the energy now Ahhhh! E T = PE g + KE

Part One: The Roller Coaster TOP SPEED!!!! Hey you stole all the energy. E T = KE

Part One: The Roller Coaster Oh no he’s getting away! To the pendulum pirate ship ride!

Part Two: The Pendulum Ride! I’ll get you now that I have all the energy! Obviously you don’t know How this ride works E T = PE g

Part Two: The Pendulum Ride! Part Two: The Pendulum Ride! That’s because we’re At the bottom now and I have it! Hey why don’t I have the energy Anymore? Well then use it!!! E T = KE

Part Two: The Pendulum Ride! Just watching this makes me nause ous! This is so confusing! Oh no, now I have the energy again! E T = PE g

Part Two: The Pendulum Ride! Look what you did he’s getting away! What I did? Don’t worry guys I’ll get him! Mwahaha!

Part Three: The Vertical Spring Ride! Full energy! You can’t reach me! E T = PE S

Part Three: The Vertical Spring Ride! GPE girl and I will take it from here Elastic Potential Energy Boy He he he E T = PE g + KE

Part Three: The Vertical Spring Ride! Hey! GPE Girl and I are going to take all the energy and we’re not going to share any with you KE Boy! Ouch! E T = PE S + PE g

Part Three: The Vertical Spring Ride! Oh no! GPE Girl are you Okay? Go on without me, don’t let him get away!

Part Four: The Horizontal Spring Ride! Quick while he’s cornered! I’ll give all my energy to you E T = PE S

Part Four: The Horizontal Spring Ride! Here have all the energy and seal the deal! E T = KE

Part Four: The Horizontal Spring Ride! OOOOOOF! E T = PE S

See what you guys can do when you cooperate Yeah yeah. Glad your feeling Better GPE Girl

Physics in Today’s Comic Law of Conservation of Energy - unless work is done on a system (energy is added) the total energy does not change E i (before) = E f (after) *When Q Man and his Evil Twin aren’t there!

Law of Conservation of Energy - unless work is done on a system (energy is added) the total energy does not change

E i (before) = E f (after)

*When Q Man and his Evil Twin aren’t there!

Solve Your Own Energy Problems! STEP ONE: Write out “knowns” and draw diagrams

STEP ONE: Write out “knowns” and draw diagrams

Solve Your Own Energy Problems! STEP TWO: Identify the ET equation for each step of the process E T = PE S + PE g + KE When there is no height PE g = 0 When the object isn’t moving KE = 0 When there is no compressed string PE S = 0

STEP TWO: Identify the ET equation for each step of the process

E T = PE S + PE g + KE

When there is no height PE g = 0

When the object isn’t moving KE = 0

When there is no compressed string PE S = 0

Solve Your Own Energy Problems! STEP TWO (CONTINUED) E T = PE S + PE g + KE PE S =1/2kx 2 PE g = mgh KE = 1/2mv 2

STEP TWO (CONTINUED)

E T = PE S + PE g + KE

PE S =1/2kx 2

PE g = mgh

KE = 1/2mv 2

Solve Your Own Energy Problems! STEP THREE: Write the E i (before) = E f (after) equation for the process described

STEP THREE: Write the E i (before) = E f (after) equation for the process described

Solve Your Own Energy Problems! STEP FOUR: Substitute and solve!

STEP FOUR: Substitute and solve!

Solve Your Own Energy Problems! - EXAMPLE What is the velocity of KE Boy at the bottom of the rollercoaster if the height of the roller coaster is 20 meters? h =20 m g = 9.81m/s v =? E i (before) = E f (after) mgh =1/2mv 2 gh =1/2v 2 (9.81m/s)(20m) = 1/2v 2 2(196.20) = 2(1/2v 2 ) 392.40 = v 2 19.81 = v

What is the velocity of KE Boy

at the bottom of the rollercoaster if the height of the roller coaster is 20 meters?

h =20 m

g = 9.81m/s

v =?

E i (before) = E f (after)

mgh =1/2mv 2

gh =1/2v 2

(9.81m/s)(20m) = 1/2v 2

2(196.20) = 2(1/2v 2 )

392.40 = v 2

19.81 = v

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