Make a Toy Fan Machine

Duration: 
(All day)

Children love to play with rotating toys. How about making one, with the children with everyday materials?

Materials required: string, hollow plastic ball (any pipe with one end close, hollow bamboo with one end closed), thin bamboo stick (or barbecue stick), ice cream stick (or anything similar)

Points of Discussion:

  • Why the string comes back after pulling?
  • Wooden butter-milk churner works on this principle.
  • Why doesn’t the toy move continuously when the thread is pulled slowly?
  • Rotational mechanics
  • Torque and Newton's Third Law

Precautions:

  • Making hole carefully
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