velocity-time-graphs-power point motion..

Velocity time graph to find the acceleration, distance travelled also find the motion of objects using graph

1. Interpret distance-time graphs; knowledge of gradients should be relied upon & revisited during this lesson. Lesson on equation of motion can revisit the ideas taught in this lesson. L1 Speed L2 Distance-time graphs L3 Speed practical L4 Acceleration L5 Velocity time graphs L6 Equation of motion

2. Velocity-time graphs 29/08/2020

3. Acceleration Speed Velocity Time Gradient Describe how to obtain acceleration from a velocity-time graph. Describe how to obtain distance travelled from a velocity-time graph. Calculate accelerations and distances travelled from a velocity-time graph. Velocity-time graphs

4. Time/Seconds Speed/m/s 5 6 10 16 15 26 20 30 25 30 30 30 35 30 40 20 45 10 50 55 Time (s) Speed (m/s) 0 10 20 30 40 50 60 70 80 0 5 10 15 20 25 30 35 40 45 50

5. Velocity-time graphs Diagonally Up Constant Acceleration Horizontal Constant speed Diagonally Down Constant Deceleration Gradient This is the acceleration of the object. Area under the graph This is the distance travelled by the object. Stretch: Calculate the acceleration from the gradient of the graph. Calculate the distance travelled from the area under the graph.

6. 6 Time (s) Velocity (m/s) 4 Accelerating accel = = 2.5 m/s 2 Distance = area = ½ x 4 x 10 = 20 m   10

7. 7 Time (s) Velocity (m/s) 6 Decelerating decel = = 1.5 m/s 2 Distance = area = ½ x 6 x 9 = 27 m   9

8. Time (s) Velocity (m/s) 3 Constant speed of 6 m/s for 6 seconds, then decelerating 6 decel = = 2 m/s 2   Distance = area =(½ x 3 x 6) + 6 x 6 = 45 m

9. Complete the worksheet Worksheet

10. Basic answers

11. Medium answers acceleration = 0.5 m/s 2 distance = 25m acceleration = 0.9 m/s 2 distance = 45m acceleration = 0.5 m/s 2 distance = 16m acceleration = -1 m/s 2 distance = 8m acceleration = -1 m/s 2 distance = 30m acceleration = -0.25 m/s 2 distance = 8m

12. Hard answers distance = 52m distance = 40m distance = 32m distance = 55m distance = 23m distance = 38m

13. Hard answers a) acceleration = 2.5 m/s 2 b) distance = 20m c) 10m d) 70m

14. Exam questions so exam conditions! You have 8 minutes! Struggle time

15. More streamlined [1] Less air resistance [1] So a higher top speed [1]