1. 1_3 Velocity time graphs Find the area of these shapes. 03 September 2015 3 3 3 5 3 4 Find the gradient of these lines. 2 2 3 62 4 yxyx

2. 1_3 Velocity time graphs 03 September 2015 3 3 3 5 3 4 2 2 3 62 4 yxyx 9 15 6 = ½ x 3 x 4 1 0.5 -2

3. 1_3 Velocity time graphs How can a v-t graph show acceleration? What does the area under a v-t graph show? 03 September 2015 How do speed cameras measure the speed of cars?

4. Acceleration – using ticker tape A ticker timer produces 10 dots in 0.2 seconds on a piece of ticker tape. Ticker timer Tape 0s0.2s Distance = 10cm How does this tape show acceleration? What is the average speed of the trolley?

5. Velocity –time graph 1.What is the area under the line? 2.What is the slope of the line? 3.Why do these answers equal the distance and acceleration? Velocity, m/s Time, s 20 15 10 5 0 0510 15 Distance = velocity x time Acceleration = velocity change time

6. Questions Velocity, m/s Time, s 8642086420 0510 15 A

7. Summary 1.The slope of the line on a v-t graph shows acceleration. 2.The area under the line shows the distance travelled.