Science B31: Round and Round


Award-winning video and lesson investigations for young children on the topic of gears

Product Description

Video and lesson investigations on the topic of gears. Key concepts include:

  • Cogwheels (gearwheels) can change the direction and speed of movement.
  • If a small cogwheel is connected to a large cogwheel, the small cogwheel revolves more often than the large one.
  • The greater the difference in size of the gearwheels, the greater the difference in speed of revolution.
  • Gearwheels can be connected directly, and also indirectly by a belt or chain. The use of gearwheels can reduce the force needed to do work. Gearwheels are features in many machines, sometimes in complex ways (for example, in a mechanical clock or watch).


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