Ring with Gap

• A ball bearing in a circular horizontal track with a gap

• 20cm diameter copper ring with gap
• Steel ball

• Bin in section 1 labelled "Circular Motion"

• Easily transportable
• Requires doc-cam or overhead projector
• Working status: Working

• The section that was removed is the minimum, so that the ball can still make it out. Place the ring on the overhead projector and flick the ball. Suggested use: ask the students to vote on what will happen
  a) ball stays inside the ring
  b) ball hits the end of the ring
  c) ball comes out freely.
  Note: The Doc Cam may not be a flat surface. You may need to adapt for this. It is suggested that you place the gap on the 'down' side - that way gravity helps it to come out of the ring. If done this way, the speed of the ball is irrelevant and it always works.