motion

• what is the difference between scalar and vector quantities?

  a vector quantity has magnitude and direction

  a scalar quantity has only magnitude
• distance - scalar

  displacement - vector

  speed - scalar

  velocity - vector

  RoCos - scalar

  acceleration - vector
• speed equation

  S = d/t
• what do each letter in the speed equation mean?

  s = speed (m/s)

  d = distance (m)

  t = time (s)
• average speed equations

  average speed = total distance travelled / total time

  average speed = initial speed + final speed / 2 (v+u/2)
• rate of change of speed equation

  RoCoS = final speed - initial speed / time taken
• velocity equation


  velocity = displacement / time
• average velocity equations

  av.velocity = final displacement / total time

  av.velocity = initial velocity + final velocity / 2 (v+u/2)
• acceleration equation

  a = v-u / t
• what do the letters in the acceleration equation mean?

  a = acceleration (m/s²)

  v = final velocity (m/s)

  u = inital velocity (m/s)

  t = time taken (s)
• what is the word(s) used to mean negative acceleration?

  retardation or deceleration
• how can you calculate speed from a distance time graph?

  speed = the gradient of dist-time graph
• how can you calculate the velocity from a displacement-time graph?

  velocity = gradient of disp-time graph
• how can you calculate RoCoS from a speed-time graph?

  RoCoS = gradient of the speed-time graph
• how can you calculate the the acceleration from a velocity-time graph?

  acceleration = gradient of the vel-time graph
• how can you calculate the distance travelled from a speed-time graph?

  distance = area under the graph
• how can you calculate displacement from a velocity-time graph?

  displacement = area under the graph
• state the equations of motion

  v = u + at

  s = ut + 1/2at²

  v² = u² + 2as

  s = 1/2(u+v)t
• what does each letter in the equations of motion mean?

  S = displacement (m/s)

  U = initial velocity (m/s)

  V = final velocity (m/s)

  a = acceleration (m/s²)

  t = time (s)