1. In pairs can you CAREFULLY go through the exam. Can you then write in your book the title 5 Things I have learnt from the exam and then list 5 things you have learnt!

2. Last lesson Falling!

3. Gravity = air resistance Terminal speed gravity As the dog falls faster and air resistance increases, eventually the air resistance becomes as big as (equal to) the force of gravity. The dog stops getting faster (accelerating) and falls at constant speed. This velocity is called the terminal speed. Air resistance

4. Falling without air resistance gravity The ball falls faster and faster and faster……. It gets faster by 10 m/s every second (10 m/s 2 ) This number is called “g”, the acceleration due to gravity.

5. Falling without air resistance? distance time

6. Falling without air resistance? speed time

7. Falling without air resistance? speed time Gradient = acceleration = 9.8 m.s -2

8. Falling with air resistance? distance time

9. Falling with air resistance? speed time Terminal speed

10. Today’s lesson Stopping distances

11. The distance a car takes to stop is called the stopping distance.

12. Two parts The stopping distance can be thought of in two parts

13. Stopping distances Thinking distance is the distance traveled whilst the driver is thinking (related to the driver’s reaction time).

14. Thinking distance This is affected by the mental state of the driver (and the speed of the car)

15. Braking distance This is the distance traveled by the car once the brakes have been applied.

16. Braking distance This affected by the speed and mass of the car

17. Braking distance It is also affected by the road conditions

18. Braking distance And by the condition of the car’s tyres.

19. Typical Stopping distances YouTube - Top Gear 13-5: RWD Braking Challenge YouTube - Think! - Slow Down (Extended) (UK) YouTube - Top Gear 13-5: RWD Braking Challenge YouTube - Think! - Slow Down (Extended) (UK)