P5: Space for Reflection

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  • Created by: Theex
  • Created on: 23-04-14 15:53
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  • P5: Space for Reflection
    • Vectors and equations of motion
      • Left -> right is +
      • Right -> Left is -
      • What the arrow shows about the vector quantity
        • Direction of arrow shows direction of vector quantity
        • Length of arrow shows size of vector quantity
      • Relative motion - how fast an object appears to be moving compared to you.
        • V of 'a' relative to 'b' = Va - Vb
      • To resolve vectors acting at 90 use pythagoras theorem
    • Equations of Motion
      • These equations can describe the motion of almost any object using maths
      • suvat
        • s = distance travelled (m)
        • u = initial velocity (m/s)
        • v = final velocity (m/s)
        • a = acceleration (m/s^2)
        • t = time taken (s)
      • Equations
        • v = u + at
        • s = ut + (1/2)(a)(t^2)
        • v^2 = u^2 + 2as
        • s = ((u + v)/2)t
    • Projectile motion
      • Mr Hays' quote: "Gravity doesn't take a holiday just because an object is moving
      • Gravity = 9.81ms^-2
      • What equations to use?
        • Vertical Plane: suvat
          • Equations
            • v = u + at
            • s = ut + (1/2)(a)(t^2)
            • v^2 = u^2 + 2as
            • s = ((u + v)/2)t
          • suvat
            • s = distance travelled (m)
            • u = initial velocity (m/s)
            • v = final velocity (m/s)
            • a = acceleration (m/s^2)
            • t = time taken (s)
        • Horizontal plane...
          • v = s / t
      • Time is the only value shared across both planes
        • What equations to use?
          • Vertical Plane: suvat
            • Horizontal plane...
              • v = s / t
      • Action and reaction
        • Newton's Third Law: "When an object collides or two bodies interact, the two objects exert an equal and opposite force on each other."
        • F = m * a
        • When t * 2, a * 1/2 because...
          • a = V / t
            • And when a * 1/2 so is F because...
              • F = m * a
        • Momentum
          • Momentum is conserved
          • Coalesce - When two objects moving in the same direction collide and stick together their momentum is then shared
          • (m1 * u1) + (m2 * u2) = (m1 + m2)Vf
          • p = m * v

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