Physics: 2

• Distance is the total length covered by a moving objects regardless of the direction
• Displacement the distance measured in a straight line in a specified direction
• Distance is always longer than displacement
• Speed is the distance travelled per unit time
• Velocity is speed in a given direction (rate of change)
• Speed= distance/time (m/s)

  v= d/t
• Velocity= displacement/time (m/s)

  v= s/t
• Acceleration is the increase or decrease of speed.
• Acceleration= (final - initial velocity)/time

  a= (v-u)/t
• Deceleration happens when the velocity of the object decreases over time
• Displacement-time graph tells us:

  1. Displacement at a given instant
  2. Velocity from the gradient of the graph
• The velocity-time graph tells us:

  1. Velocity at a given instant
  2. Acceleration from the gradient of the graph
  3. Displacement and distance from the area under the graph