energy

Question 1

what is a fuel

Answer 1

somethng that is burnt to release energy

Question 2

name some energy sources

Answer 2

oil, gas, coal, biomass, food, wind, waves , batteries, geothermal, hydroeletric, solar

Question 3

differences between renewable and non-renewable energy sources

Answer 3

renewable - can be replenished within a lifetime, e.g. solar
non renewable - cannot be replensihed within a liftime and will eventually be used up r.g. oil, gas, coal

Question 4

what are the advantages of using non-renewable energy sources

Answer 4

they release allot of energy, reliable, high energy dense

Question 5

what are the disadvantages of using non-renewable energy sources

Answer 5

the will one day run out, they release carbon dioxide which leads to global warming and acid rain

Question 6

what are the advantages of using renewable energy sources

Answer 6

they do not produce carbon dioxide and there is a constant and infinite supply

Question 7

what are the disadvantages of using renewable energy sources

Answer 7

they are not reliable, they do not produe as much energy as non-renewable

Question 8

what is energy measured in

Answer 8

joules, kilojoules

Question 9

name the 8 forms of energy

Answer 9

chemical - batteries, food
eletrical - battery
gravitational potential - objects at height
kinetic - a moving car
light - a torch
sound - a radio, a hairdryer
elastic potential - a tight elastic band
thermal - fire, a cup of tea

Question 10

descrie the energy transformation when you switch on a lamp

Answer 10

eletrical energy is transferred into light energy (useful) and thermal energy (waste)

Question 11

describe the energy transformation when you use a vacuum

Answer 11

eletrical energy is transferred into kinetic energy (useful) and sound energy (wasted)

Question 12

name and give descriptions of the 5 main contact forces

Answer 12

friction - force that prevents objects moving or slows them down when moving
drag - caused by friction from air
upthrust - is produced by water pushing upwards on an object
surface tension - this helps raindrops keep their shape and allows some insects to move on waters surface
reaction force - the force acting in the opposite direction

Question 13

name and give descriptions of the 3 main non-contact forces

Answer 13

gravity - this is the force that pulls objects down to the centre of the planet and which gives them weight. gravity us present between any two objects.
magnetic force - the force produced by a magnet that affects magnetic materials such as iron. usually only works over a short distance
electric force - from static electricity that can attract objects. this also tends to act over a short distance

Question 14

formula triangle for distance

Answer 14

distance = speed x time