Missed out bits on p1 +p2 Flashcards
Describe a pendulum in moton
-As the pendulum swings down and towards the cener , is gravitatonal potential energy store decreases and its kinetic energy store increases .
-As thependulum moves upwards and away from the cetner , its gravitational potential energys tore iincreases , as its kinetic energy decreases .
Bungee jumping
-we ropse is slack eenrgy id trasnferred from gpe to the kinetic enery store ,a s the jumper accelerated towards the groudnd due to graity .
-When rope tightens slows don the jupers fall , reduceing speed of jumper .
-Jumpers Ke decreases , nd elastic pe increases as rpe streches .
-eventually the jumper sops , all keahs whent to epe .
–After reachign bottom rope recoils , pulls jumper up, kuper rise s, epe decrease , jumpers ke increases , until roep slack .
-After rope slack , ke decreases as he at top ascnee and gpe uncreases .
-he dosentreturn to orianl height , AS SOME ENERGY WAS TRANSFERRED OT THEMRLA ENERGY STORE OF THE SURROUNINS BY HEAT , as the rope streched an dhsortedned .
How does friction in break pads work
-Friction between the brake pads ,a nd the wheel discs oppose the motion of the wheel .
-The force of friciton does work on the brake pads ad wheel discs ,
-As a reuslt emerhu is transereed from KE , to THE of brake pads and wheel disks .
-Makign theh ot an transer enery by heting ot THE of air .
How does wind power work .
-A wind turbine is an electircty geenrtor at the top of a narrow tower .
-The force of the wind drives the turbines baldes around .
-TTrunisn a gernerator this does .
-Power gernated icnreses as the wind speed increases .
-UNRELIABLE STILL . ALSO DISRUPTING WHINGING NOSIES FOR PEEPS LIVIGN NEARBY
WAVE POWER
-Waves make a floating genraotr move upa nd down .
-This motion turns thegernotr so it generstes elecitiecy .
-A cable between genraotro and shoreliens deliers it to gridsytem .
-Need t withstand storms so dont produce a constant uspply of elecitrcy . Tidal flow patter could affect habitats .
HEP
-can begenerated when rainwater is collected in a reevror , flowds donhill .
-The flowign water drievs turbines that turn electircy genraots at the otom o th hill . HABITATS FLOODED
TIDAL PWOER
-Traps water from each high tide behind a barage .
-The high tide can then be released into the sea thorugh turbines .
-The turbines drive generators in the barra.ge
Geotherml energy
COmes frome nergy released by radioactie substances deep withtin Earth
-The energy transferred fromt hese radiactive subcstances heat the surrodunign work .
-SO energy is transferred by heating towards the Earths surface .
THE UK HAS ABUNFANT RESEVRVS OF COAL THAS HWY . But hwy did tuhe use of coal fall .
-nUCLEAR POWER , producing 20%of all uk electricity .
-OIL+GAS formNORTH EA , repalcing ocla for electicity .
What are the benefits from switching from coal ot ga s.
-Burning gas generates less carbondioxide than coal . Contribtuiting to less climgte change .
-Gas fire power stations are flexible - can be switched onquickly during periods of high demand (short startuptime).
-Wehereas coal pwoer statons have a very long start time .
Relaised CO2 lead to climte change
-But as fossil fuels were cheap
-swtiching would be costly .
Countries signed hte jytoto protocol to reduce ghg .
-UK ACTUALLY BEST LOCATION OFR WINDPWOER 11% RN .
PLAN FOR FUTURE
-Renweables will provide the bulk of our electricity .
-with nculear powering the base laod as i cant be quicklyt unred on and off so always on and now ghg emissions .
-*and gas porviding electircyt during periods of peak demand .
