motion

• typical speeds are:

  • walking = 1.5 m/s
  • running = 3 m/s
  • cycling = 6 m/s
  • sound in air 330 m/s
• the average speed is the constant speed at which the car would cover the same distance in the same time at the actual journey
• speed is a scalar
• scalar has a size but no direction
• velocity is a vector
• vectors have a size and direction
• acceleration is the rate of change of velocity
• Label the distance time graoh as how the object is moving

  A-constant speed (backwards)

  B- stationary

  C- constant speed (faster)

  D- constant speed (slower)

  E- decreasing speed (getting slower)

  
• Label the velocity-time graph with how the object is moving

  A-uniform deceleration

  B- constant speed

  C- uniform acceleration (bigger)

  D- uniform acceleration (smaller)

  E- decreasing acceleration (speeding up)

  
• On a distance time graph the gradient is the speed
• On a velocity time graph the gradient is the acceleration
• Displacement if the most direct rout so it is a vector
• Area under velocity time graph is the distance