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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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