1) A model car moves in a circular path of radius 0.80 m at an angular speed of π/2 rad s^–1.

2) A record on a turntable is rotating at a constant number of revolutions per second.
Which graph best represents the relation between the speed v of a point on the record and his distance r from the centre of rotation?

3) The maximum safe speed of a car rounding an unbanked corner is 20 m s^–1 when the road is dry. The maximum frictional force between the road surface and the wheels of the car is halved when the road is wet. What is the maximum safe speed for the car to round the corner when the road is wet?

4) The diagram represents a cyclist making a left turn on a rough road surface at constant speed v, as viewed from behind. The total mass of the bicycle and rider is m and their combined centre of gravity is at G.

If R is the resultant force of the normal contact force and the frictional force, which vector diagram represents the directions of the forces acting on the bicycle and its rider?

5) The diagram shows the top view of a frictionless sheet of ice. A puck, tied with a string to a point P, slides on the surface of the ice in the circular path shown.

If the string suddenly breaks when the puck is in the position shown above, which path best represents the puck's subsequent motion?