energy

Question 1

conduction

Answer 1

takes place in solids

1) particles close to the source gain thermal energy
2) particles start to vibrate vigorously
3) the particles collide with the adjacent particles, passing on thermal energy and kinetic energy
4) this will keep happening until all the particles are vibrating at the same speed and temp

Question 2

convection

Answer 2

takes place in fluids (liquids and gases)

1) particle close to the source gain thermal energy
2) they move faster and spread out
3) the water becomes less dense
4) less dense water rises to the top
5) As it rises to the top, hot particles pass its energy to cold particles (less energy)
6) particles move slower and move closer together and the water becomes more dense, sinking to the bottom

Question 3

how to tell if its radiation

Answer 3

travels through vacuum. any object above absolute zero (-273 degrees c) or 0 kelvin

anything will radiate heat in the form of

ems/waves

Question 4

radiation steps

Answer 4

• hot objects radiate at more infrared radiation
• cold objects radiate at less infrared radiation
• black surfaces absorb and radiate energy the best
• white surfaces reflect thermal energy and absorb the least amount of it
• radiation can be reflected

Question 5

reducing energy loss due to conduction

Answer 5

create a vacum so that no energy can be transferred

• double glazing and vacuums will reduce conduction
• trapped air will reduce it, e.g. carpets on the floor, curtains

Question 6

reducing energy loss due to convectoin

Answer 6

wear lots of layers because there is trapped air in between

penguis have many hairs because there is trapped air in between

Question 7

reducing energy loss through radiation

Answer 7

smooth shiny surface will reflect

e.g. foil insider of thermos flask

Question 8

in a house- protections

Answer 8

roof- loft insulatiom
windows- double glazing/curtains
floor- carpet 
doors- draught proofing
walls-cavity wall insulation

Question 9

for finding the speed of an object just before it hits the ground

Answer 9

v = square root of 2xgxh

Question 10

magnetic

Answer 10

energy in magnets and electromagnets

Question 11

kinetic

Answer 11

the energy in movement objects

Question 12

heat

Answer 12

also called thermal energy

Question 13

light

Answer 13

eg a radio signal

Question 14

gpe

Answer 14

stored energy in raised objects

Question 15

chemical energy

Answer 15

stored in foods, fuel and batteries

Question 16

sound energy

Answer 16

energy released by vibratng objects

Question 17

electrical energy

Answer 17

energy in moving or static electric charges

Question 18

elastic potential energy

Answer 18

stored energy in stretched or squashed objects

Question 19

nuclear energy

Answer 19

stored in the nuclei of atoms e.g. nuclear power plant