Lessons 1-4 Flashcards
what is the formula for speed/velocity
v= Δd/Δt
SI unit for distance
metres, m
SI unit for velocity
m/s, ms^-1
SI unit for mass
kilograms, kg
SI unit for temperature
degrees celsius, °C
SI unit for energy
Joules, J
SI unit for time
seconds, s
SI unit for force
Newtons, N
how to convert ‘milli’ to SI unit?
divide by 1000
how to convert ‘kilo’ into SI unit?
times by 1000
how to find total average speed?
total distance/ total time
Kinetic E (KE or Ek)
The E of an object due to motion.
Gravitational potential E (GPE or Egp)
The E of an object due to its position on the gravitational field.
Elastic potential E (Eelast)
The E stored in an object due to it being stretched or compressed.
Chemical potential E (Ech)
The energy stored in chemical bonds.
Thermal energy (Eth)
E contained in an object due to temperature.
Work energy transfer
When a force moves an object through a distance.
Heating (Eh or Q)
When energy flows from hot→cold objects, don’t confuse with thermal energy.
Electricity (Eelect)
When energy is transferred by an electrical current.
Waves
By sound or electromagnetic radiation.
what are two examples of useless energy transfer
heat and sound
define friction
a force that opposes motion, generates heat and sound.
