PHYSICS P2 1.MOTION

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  • Distance time graphs
    • They show whether an object is stationary (Horizontal line)or whether it is moving at a constant speed which is a straight line that slopes upwards
      • The Gradient of a line on a  distance time graph represents speed
    • Speed
      • With an object that is moving at a constant speed. I can calculate its speed by ...
      • EQUATION- SPEED (m/s) =         distance  travelled (m) / time taken in seconds
      • DISTANCE = SPEED/TIME
      • Speed in action: TACHOGRAPHS IN CARS (CHECK DRIVERS DON'T DRIVE FOR TOO LONG.)
    • PHYSICS P2 1.1 Motion
      • Velocity
        • DEFINITION: VELOCITY IS SPEED WITH A GIVEN DIRECTION
        • When an object moving steadily around a circle it HAS a constant SPEED. However the direction of the motion changes  continuously  as it goes around so the velocity  is not constant.
        • Two moving objects can have the same speed by different velocities, depending on the direction in which they are going.
        • Acceleration
          • Acceleration of an object is its change in velocity per second
            • UNIT: METERS  PER SECOND SQUARED
          • ANY OBJECT WITH CHANGING VELOCITY IS ACCELERATING.
            • EQUATION:  ACCELERATION (M/S2)= Changing velocity per second  m/s  / time taken for change in seconds.
              • For an object that  accelerates from an initial velocity (u) to a final velocity v) you have to do the following equation. ..
                • EQUATION : ACCELERATION (A)= v-u / time.
                  • EQUATION:  ACCELERATION (M/S2)= Changing velocity per second  m/s  / time taken for change in seconds.
                    • For an object that  accelerates from an initial velocity (u) to a final velocity v) you have to do the following equation. ..
                      • EQUATION : ACCELERATION (A)= v-u / time.
            • DECELERATION: NEGATIVE ACCELERATION FOR ANY SITUATION IS WHEN AN OBJECT SLOWS DOWN.
        • More about VELOCITY TIME GRAPHS
          • The gradient of a line on a velocity-time graph represents acceleration
          • If a velocity-time graph is a horizontal line, the acceleration is ZERO.
    • BRAKING
      • More about VELOCITY TIME GRAPHS
        • The gradient of a line on a velocity-time graph represents acceleration
        • If a velocity-time graph is a horizontal line, the acceleration is ZERO.

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