1. Circular Motion What goes around comes around…

3. Circular Motion - Velocity v a This involves any objects travelling in a circular path whether horizontal or vertical. Velocity is at a tangent (90° to the radius) to the circular path. Velocity equals the circumference divided by the time taken to ‘go around’ the circle i.e. 𝑣=𝑑𝑡 , 𝑑=2𝜋𝑟 So, 𝒗=𝟐𝝅𝒓𝑻 where T is called the ‘time period’ and is the number of seconds for one orbit.

6. http://www.youtube.com/watch?v=-G7tjiMNVlc http://www.youtube.com/watch?v=L6-kn2tB-9E Discuss with your neighbour what is supplying the centripetal force in the situations on the right….

7. Questions…

8. If the force an object in circular motion experiences is inward, why do we slide ‘outwards’ when driving around a sharp corner?HINT: SAME AS WHY DO WE LURCH FORWARD WITH A SUDDEN BRAKE?http://www.physicsclassroom.com/Class/circles/u6l1c.cfm

10. The sum of the unbalanced forces acting on the object give the resultant, centripetal force (Fc).

11. (Remember support force is perpendicular to the surface, weight force is always vertical) ….. Add vectors head to tail.

12. Add them together and we get…Support Force W=mg We will usually be given this angle… why? 𝜃 Fc