1. See Top Gear cars on ice rink
Circular motion
See Top Gear cars on ice rink
‘Winter Olympics’

2. For anything to go in a circle there has to be a force.
P3 1.5
Circular motion
For anything to go in a circle
there has to be a force.
Otherwise they would…
….. continue in a straight line
out of the solar system

3. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre VA A

4. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre VA A VB B

5. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre
* object accelerates continuously towards the centre VA VB A B

6. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre
* object accelerates continuously towards the centre VA VB A B
Acceln = change in velocity
time taken

7. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre
* object accelerates continuously towards the centre
* centripetal force causes the central acceleration VA VB A B
Acceln = change in velocity
time taken

8. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre
* object accelerates continuously towards the centre
* centripetal force causes the central acceleration VA VB A B
Acceln = change in velocity
time taken
Force = mass x acceln

9. P3 1.5
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre
* object accelerates continuously towards the centre
* centripetal force causes the central acceleration VA VB A B
Acceln = change in velocity
time taken
Force = mass x acceln

10. To travel in a circle at constant speed, the
Circular motion
To travel in a circle at constant speed, the
* velocity changes direction towards the centre
* object accelerates continuously towards the centre
* centripetal force causes the central acceleration VA VB A B VB
- VA
Acceln = change in velocity
time taken VB VA
Acceln = T
Force = mass x acceln
Mathematically it can be shown that acceln = V2 r
Force = mass x V2 r

11. P3 1.5 Circular motion Force = mass x V2 r
The Centripetal force needed increases if :
the mass increases
the speed increases
the radius of the circle decreases

12. P3 1.5
Circular motion

13. P3 1.5
Circular motion

14. P3 1.5
Circular motion