Motion 1

• Distance: is length between two points. It is a scalar quantity. The SI unit is meter
• Displacement: the shortest distance between two points. The SI unit is meter. It is a vector quantity.
• Speed: Distance moved by the body in unit time. The SI unit is meters per second

  $Speed=$$distance/time$
• Uniform speed: is the speed the where the body covers equal distances in unit time.
• Average speed: is defined as the total distance travelled divided by the total time taken.

  $AV=$$Total distance/ Total time$
• Variable speed: is the speed of a body moving between two points with different speeds
• Instantaneous speed: is the speed of a body at a particular time
• Velocity: is the speed of a body in a specific displacement in unit time or the rate of change in displacement. The SI unit m/s. It is a vector quantity
• Average velocity: is defined as the total displacement divided by the time taken

  $Average velocity=$$total displacement/ time taken$
• Acceleration: is the change in velocity in unit time or the rate of change of velocity. The SI unit is m/s2. It is a vector quantity

  $Acceleration=$$final velocity- initial velocity/time$
• Deceleration: is when the velocity of a body decreases uniformly.