physics on the move

• typical speed in m/s of walking

  1.5
• typical speed in m/s of running

  3
• typical speed in m/s of cycling

  6
• typical speed of a car in m/s

  10 - 30
• typical speed of a passenger aeroplane in m/s

  200 - 250
• what do typical speeds of a person walking/cycling/running depend on?

  age, terrain, fitness and distance
• what do typical speeds of transportation systems depend on?

  shape, design, cost and purpose
• what is the acceleration of an object?


  a measure of how quickly its velocity changes
• what is the typical acceleration (m/s^2) of a falling object?

  10
• what is the typical acceleration (m/s^2) of a family car?

  2 - 3
• what is the typical acceleration (m/s^2) of a rocket?

  30
• what is the typical acceleration (m/s^2) of a formula 1 car?

  50
• what is the typical acceleration (m/s^2) of a fighter jet?

  90 - 120
• mass


  kg
• length

  metre
• time

  second
• current

  ampere
• temperature

  kelvin
• amount of substance

  mole
• frequency


  hertz
• force

  newtons
• energy

  joules
• power

  watts
• pressure

  pascal
• electric charge

  coulomb
• potential difference

  volts
• electrical resistance

  ohms
• giga

  10 to the power of 9
• mega

  10 to the power of 6
• kilo

  ten to the power of 3
• centi

  ten to the power of -2
• milli

  ten to the power of -3
• micro

  ten to the power of -9
• human reaction time?

  0.2 - 0.9 seconds
• stopping distance = thinking distance + braking distance
• factors affecting braking distance

  speed

  vehicle condition

  road condition

  mass of the vehicle
• factors affecting thinking distance?

  tiredness, distractions and intoxication
• the greater the speed of the vehicle, the _______ the stopping distance

  larger