Lesson 0.1: Grade 7 & 8 Recall

• Speed - It is the distance travelled per unit of time.
• Formula for speed: speed = distance/time
• Units for speed: mi/h, km/h, m/s
• Velocity - It describes the speed and direction of an object.
• Formula for Velocity: v = ->d/t , where v = velocity, ->d = distance, t = time interval
• Units for Velocity: m/s, km/h, mi/h or mph
• Scalar Quantity - It measures the magnitude of moving object.
• Vector Quantity - It measures the magnitude and direction of moving object.
• Acceleration - It is the change in velocity over time.
• Acceleration = Change in Velocity (Speed, Direction, or Both)

  • Increasing Speed
  • Decreasing Speed
  • Changing Direction
• Formula for Acceleration: a = Δv/t, where a = acceleration, v = change in velocity, t = time or a = vf-vi/t, where vf = final velocity, vi = initial velocity
• Units for Acceleration: m/s^2, km/h^2, mi/h^2