topic 1 energy

Question 1

what is energy transferred between

Answer 1

stores

Question 2

what are the 8 energy stores

Answer 2

thermal, kinetic, gravitational potential, elastic potential, chemical,magnetic, electrostatic and nuclear

Question 3

a system

Answer 3

another word for a single object such as the air in a piston

Question 4

How is energy transferred

Answer 4

transferred mechanically (force doing work), electrically (work was done by moving charges), heating or by radiation (light or sound)

Question 5

energy transferred by heating

Answer 5

example a kettle transfers energy to the water by increasing the waters thermal temperature

Question 6

movements energy store

Answer 6

kinetic energy stores transfers to this store when it speeds up and transfers away when it slows down

Question 7

raised objects energy stores

Answer 7

when it falls it loses gpe stores to kinetic energy

Question 8

stretching energy stores

Answer 8

transfers to elastic potential energy stores

Question 9

specific heat capacity

Answer 9

The amount of energy that is needed to increase the temperature of 1kg of something by 1 degrees

Question 10

lubrication

Answer 10

reduces frictional forces so that energy is not wasted in heat or sound ect

Question 11

conservation of energy

Answer 11

energy can be transferred, stored or dissipated but can never be created or destroyed

Question 12

power

Answer 12

The rate of doing work how much is done per second

Question 13

conduction

Answer 13

the process where vibrating particles transfer energy to neighbouring particles this is done by the particles transferring the thermal stores to the other particles

Question 14

convection

Answer 14

only happens in liquids and gases and is where particles move away from hotter to cooler regions happens when energy is added to the thermal stores meaning there are bugger gaps as they move faster because gases and liquids can flow the less dense liquid and gas rise creating a heat source

Question 15

radiators how they work

Answer 15

energy is transferred from the radiator to air particles due to conduction so the air around the radiator heats up and becomes less dense and rises meaning the air around it is cold and then heated by the radiator when the warm air rises it hits walls ceilings etc causing to become denser and sink back down to heat up again

Question 16

ways to increase insulation in houses

Answer 16

cavity walls have an inner and an outer wall and air is trapped in the gap so reduces the energy transferred through. loft insulation stops convection currents from occurring. double glassed windows trap air in the gap again and stop energy transfer. draught excludes at doors and windows to stop warm air escaping.