topic 1 - energy

Question 1

what are the 8 energy stores?

Answer 1

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

Question 2

what is a system

Answer 2

a single or group of objects your interested in

Question 3

what happens when a system changes?

Answer 3

energy is transferred into or away from the system and different stores.

Question 4

what is work done?

Answer 4

energy transferred e.g a current working against resistance in a circuit

Question 5

whats a moment?

Answer 5

a moment is energy in an energy in an objects kinetic energy store

Question 6

what happens to energy in kinetic store when an objects speeding up

Answer 6

it incrrases. the energy also depends on the mass of the object

Question 7

when is there energy in GPE store

Answer 7

when an object is raised

Question 8

what else does GPE energy get affected by

Answer 8

mass of object

Question 9

when is energy added to elastic potential energy

Answer 9

when an object is stretched or squashed

Question 10

what is meant by specific heat capacity

Answer 10

the amount of energy needed to heat 1 kg of material by 1 degrees celcius

Question 11

what happens when a material can store alot of thermal energy nefore warming

Answer 11

transfer lots of energy when cooling down

Question 12

specific heat capacity practical

Answer 12

1. use a solid blocks with holes for the heater and thermometer. measure blocks mass and insulate. insert heater and thermometer
2. measure initial temp. connect circuit to 10V power supply, turn on power and start stopwatch.
3. record temperature at regular intervals
4. after 10 readings turn off power supply
5. calculate power supplied using P= voltage x current
   determine energy transferred using E= Pt
6. repeat and compare

Question 13

1