Energy - PART 1 (P1) Flashcards
what is kinetic energy
energy stored by a moving object
what is elastic potential energy
energy stored in a stretched spring, elastic band
what is gravitational potential energy
energy gained by an object raised above the ground
what is a system
an object or group of objects that interact together e.g kettle boiling water
what are energy stores
kinetic, chemical, thermal, gravitational potential energy, elastic potential, magnetic, electrostatic, nuclear
ways to transfer energy from one store of energy to another
light, sound, electricity, thermal, kinetic
unit
Joules(J)
what is work
- doing work transfers energy from one store to another
- by applying a force to an object the energy store is changed
what is power
the rate of energy transfer
1 Joule of energy per second = 1 watt of power
what is the unit for specific heat capacity
J/KG*C
what is the unit for temp change
*C
what is the unit for work done
J
what is the unit for force
N
what is the unit for distance moved
metres
what is the unit for power
Watts
what is the unit for time
seconds
what is specific heat capacity
energy needed to raise 1Kg of substance by 1*C
mechanical
force acts upon an object
electrical
electric current flow
heat
temp difference between objects
radiation
electromagnetic waves or sound
what happens in a closed system
no change in total energy system
what happens in an open system
energy can dissipate
what is useful energy
energy transferred and used
