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physics chaopet 1

tyoes if enegry stores

chemical, elastic, themral, magnetic, nuclear, gpe, kinetic, electrical, sound, light, mechanical

conservationof enery

no enery gets destoryed and no energy gets created

system

collection of objects that can be identified

closed system

an isolated system; no energy comes in or gets out

pendulum

a= max gpe
a-b= gpe down, kinecti up

b= kinecti

b-c= kinetic down, gpe up

c= gpe

bungee jumping

beofr jimping = max gpe
as u jump and fall = kinetic up gpe down

falling= kinetic, gpe downnn

rope recoiling= elastic up, kinetic down, gle.up

coming bakc up= elastic, gpe up, kinetic down

bunge

force of rope reduces speed of jumper
rope recoils n pula jumoer back up

work work work work work

work done = energy transferred
work= f×d

friction

frictoo converts kinine5ic enegry to thermal

rubbing ur hands cogousoglu

the muscles in ur hand do work to ivercome, work done trnasfwrs energy kinetic energy which then transfers thermal energy because of friction

brake pads

kinrtoc energy of vehicle trnasfers to thermal because of the friction vetween the brake pads and wheel discs

metoriws

the meteorites gpe transfers to kinetic to thermal bevause of friction against it caused ny air resistsntacne

gpe

the energy an objevt stores bcs if its positio

ep

ep= mgh
measure in ju

oules

kinetic energy

the energy an object stores because its moving

ek

ek=1/2mv²
m=ek÷.5v²

v²= ek÷.5m

ee

ee=1/2ke²
k=ee÷.5e²

hookes law

f=ke where k is the spring constant

extension

final length - original length

slring constabt

a measure of how strong a spring is

disspiraiton

spreading iut

useful energy

energy transferrred in the place we want it and the form we need it

watsed energy

energy that isnt usefully transferrred and is undesired

disspurpatioj eule

watsrd neegy js didspitatd
useful energy is eventually disspitauted

wnergy becomes less useful the more it dissipates

wffiency

useful enrgy÷total×100
no unit

input enrgy

energy supplied to the devide

total input enery formual

usdufl energy+wasted energy

clockwork radio

when u turn a handle, u wind up a spring and increase ee. when the spring unwinds, its energy is trnasferred to kinetic and it turns a small eletric generator

choosing an electric appliance

hsould waste as less energy as possbike

what energy do we use most

electricity, gas, oil

uses of everyday elecvruricyut

lighting, heating, making objects move by using an electric motor, producing sound and visula images

power=

rate of trandfer of energy
meaudted in watts

1kw

1,000 watts

1mw

1,000,000 watts

wated power

total-useful power in

hr to s

×3600

m to s

×60

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