Y3 Y4 ACSI IP Physics Chapter 2a

CORE NOTES CHAPTER 2A: KINEMATICS GRAPHS - Displacement-time graphs Positive gradient à moving in forward direction Negative gradient à moving in reverse direction Above x-axis à in front of start point (positive displacement) Below x-axis à behind start point (negative displacement) Displacement-time graph Interpretation Derived velocity-time graph Zero velocity In front of start point No displacement – same position Constant velocity Forward direction Away from start point Increasing velocity (speeding up) Forward direction Away from start point Decreasing velocity (slowing down) Forward direction Away from start point Constant velocity Reverse direction Approaching start point Increasing velocity Reversing direction Approaching start point Decreasing velocity Reversing direction Approaching start point

By: Oscar Chiang Page 2 Zero velocity Behind start point No displacement – same position Constant velocity Negative forward direction Away from start point Increasing velocity Negative forward direction Away from start point Decreasing velocity Negative forward direction Away from start point Constant velocity Negative reversing direction Approaching start point Decreasing velocity Negative reversing direction Approaching start point Increasing velocity Negative reversing direction Approaching start point

By: Oscar Chiang Page 3 - Velocity-time graphs Positive gradient à acceleration Negative gradient à deceleration Above x-axis à in the positive direction Below x-axis à in the negative direction Velocity-time graph Interpretation Derived acceleration-time graph Constant velocity Zero acceleration (towards positive direction) Increasing velocity Constant positive acceleration Increasing velocity Increasing positive acceleration Decreasing velocity Decreasing positive acceleration Decreasing velocity Constant positive deceleration Decreasing velocity Increasing positive deceleration Decreasing velocity Decreasing positive deceleration

By: Oscar Chiang Page 4 Constant velocity Zero acceleration (towards negative direction) Increasing velocity Constant negative acceleration Increasing velocity Increasing negative acceleration Decreasing velocity Decreasing negative acceleration Decreasing velocity Constant negative deceleration Decreasing velocity Decreasing negative deceleration Decreasing velocity Increasing negative deceleration