Energy stores and systems

what are the types of energy stores

magnetic energy

nuclear energy

chemical energy ( held in chemical bonds)

electrostatic energy

kinetic energy ( movement or motion)

thermal energy

electrical energy

elastic potential

gravitational potential

what is the law of conservation of energy

energy is never created or destroyed it’s only ever transferred between different forms and objects

what are the four ways ways energy can be transferred?

mechanically (stretching elastic bond

electrically ( charge moving through a pD)

by heating ( from a hotter object to a colder one eg. convection and conduction)

radiation ( energy transferred by E-M waves)

what is work done

another way of saying energy transferred

what is electrical work done?

when current flows, energy required to overcome resistance of wires in a circuit

what is mechanical work done

mechanical involves using force to move an object eg. kicking a ball from chemical energy store in legs to kinetic energy store in ball

a collection of matter is called a ——

system

closed system

in a closed system it’s separated from the outside world so neither matter nor energy can enter or leave ( overall energy change is 0)

open system

the matter of the system can exchange energy with its surroundings/outisde world, so an open system can lose or gain energy as it reacts with the outside world