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energy stores &work done (falling objects also transfer energy (1)…
energy stores &work done
energy is transferred between stores
energy stores you need to know
4) elastic potential energy stores
5) chemical energy stores
3) gravitational potential stores
6) magnetic energy stores
2) kinetic energy store
7) electrostatic energy stores
1) thermal energy store
8) nuclear energy store
when energy is transferred to an object the energy is stored in one of the objects energy stores
energy is transfer mechanically b a force doing the work electrical by heating or by radiation
when a system changes energy is transferred
2) when the system changes energy is transfer it can transfer into or away from the system between different objects in the system or between different types of energy stores
3) closed systems are systems where neither matter nor energy can be entered or leave the net change in the total energy of a closed system is always zero
1) a system if a fancy word for a single object or a group of objects
energy can be transferred by heating
1) boiling water in a kettle water is a system energy is transferred to the water the kettles heating element by heating into the waters thermal energy store
2) water and kettle heating can be two objects energy is transfer electrically to the thermal energy store of the kettles heating element which transfers energy by heating to the waters thermal energy store
energy can be transferred by doing work
1) work done is just another way of saying energy transferred they are the same thing
2) work can be done when current flows or by a force moving an object
the friction between a cars brakes and its wheels does work as the car slows down it causes an energy stores to the thermal energy store of the surroundings
in a collision between a car and a stationary object the normal contact force between the car and the object doesn't work it causes energy to be transferred from the cars kinetic energy store to other energy store some energy might also be transferred away by sound waves.
the initial force exerted by a person to throw a ball upwards does work it causes an energy transfer from the chemical energy tore of the persons arm to the kinetic energy store of the ball and arm
falling objects also transfer energy
1) when something eg ball is dropped from a height its accelerated by gravity the gravitational force does work
2) as it falls energy from the objects gravitational potential energy store is transferred to its kinetic energy store
3) for a falling object when there's no air resistance
ENERGY LOST FROM THE G.P.E STORE = ENERGY GAINED IN THE KINETIC ENERGY STORE