1831122
| Question | Answer |
| density | mass / volume |
| average speed | distance moved / time taken |
| What is velocity? | the speed of something and its direction (vector) |
| average acceleration | change in velocity / time taken |
| resultant force (force) | mass X acceleration |
| weight | mass X g |
| What is g in terms of Newtons | g = 10N/kg |
| What is Newtons third law of motion | If object A exerts a force on object B, then object B will exert an equal but opposite force on object A |
| momentum | mass X velocity |
| change in momentum (impulse) | resultant force X time |
| load | spring constant X extension |
| pressure | force / area |
| work done | force X distance moved (in the direction of the force) |
| what is work done equal to? | energy tranformed |
| gravitational potential energy | mgh (weight X g X height) |
| kinetic energy | |
| efficiency | useful work done (useful energy output) / total energy input |
| power | work done / time taken |
| useful power output | force X speed |
| How many degrees Celcius is 0 K? | -273 degrees |
| What is the wave equation? | speed = frequency X wavelength |
| What is the refractive index? | refractive index = speed of light in vacuum / speed of light in medium |
| charge | current / time |
| potential difference | voltage at the beginning of a circuit - voltage at the end of a circuit |
| resistance | p.d across conductor (V) / current through conductor (A) |
| What is Ohms law? | that current is proportional to the potential difference in a ciruit |
| How does one calculate the combined resistance in series circuits? | R = R1+ R2 |
| How does one calculate the combined resistance in parallel circuits? | or combined resistance = resistance multiplied / resistance added |
| power | energy transformed / time taken or power = p.d X current |
| energy transformed | power X time taken or p.d X current X time taken |
| How can the ratio of the voltage and the number of turns on the input and output (primary and secondary) coils be described? | output voltage / input voltage = turns on output coil / turns on input coil |
| How can the ratio of power in a transformer be described? (if no energy is lost) | input voltage X input current = output voltage X output current or V1 X I1 = V2 X I2 |
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