Motion (CP1)

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  • Motion
    • Vectors and Scalars
      • Vector quantities have both magnitude and direction
        • Force, displacement, velocity, acceleration, momentum
      • Scalar quantities only have magnitude
        • Mass, distance, speed, energy, time
    • Distance/time graphs
      • Example
      • Speed equation: speed (m/s)  = distance(m) / time (s)
      • Speed is calculated from gradient of the line
        • horizontal line mean object is stationary
        • Straight, sloping line means object is travelling at a constant speed
        • the steeper the line, the faster the object is travelling
    • Acceleration
      • It is a change in velocity - vector quantity
      • Unit: m/s^2
      • Acceleration due to gravity is 9.8m/s^2 / 10m/s^2
      • Acceleration equations
        • acceleration = change in velocity (m/s) /time taken (s)
          • a=v-u/t
        • final velocity^2-initial velocity^2 = 2 * acceleration * distance
          • v^2-u^2=2ax
    • Velocity/time graphs
      • Example
      • What the line means
        • horizontal line means the object is travelling at a constant velocity
        • gradient shows acceleration (line going down means object is decelerating)
        • negative velocity shows the object is moving in the opposite direction
        • distance is the area under the line
          • calculate by using the numbers at the axis for measurement - not ruler
  • Scalar quantities only have magnitude
    • Mass, distance, speed, energy, time

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