gcse

• scalars are:

  • speed
  • mass
  • energy
  • temperature
  • distance
• Inertia is an objects tendancy to stay constant
• transverse waves are perpendicular with the direction of energy
• the frequency of waves is number of waves per second
• sound with a frequency above 20khz is called ultrasound
• Longitudional waves are parallel with the direction of energy
• p-waves are longitudional
• sound waves are longitudional
• thinking distance in a car is affected by:

  • speed
  • distractions
  • alcohol
  • drugs
  • tiredness
• p-waves can travel through liquids, s-waves cant
• induced magnets become magnetised when in a magnetic field
• permanent magnets always produce a magnetic field
• stopping distance = thinking distance + braking distance
• if speed is doubled thinking distance is doubled
• if speed is doubled braking distance is quadrupled
• Braking distance is affected by:

  • the condition of the brakes
  • the condition of the tyres and road
  • the weather
• gravitational potential = mass x grav field strength x height