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(b) Discover if your predictions were correct by
rebuilding your models with two gears that are
different in size using these images.
(c) Think of a way to compare the speed that the fan
turns, with the speed of the crank when the big gear
is attached to the crank and the small gear is attached
to the fan blades.
(d) How easy/hard is it to turn the crank with this
arrangement compared to when the gears were the
same size?
• Make a note of your responses in your notebook.
(e) Compare the speed at which the fan turns with the
speed of the crank, when the small gear is attached to
the crank axle and the big gear is attached to the fan
blade's axle.
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(f) How easy/hard is it to turn the crank with this
arrangement, compared to when the gears were (i)
the same size and (ii) the large gear was the driver?
• Make a note of your responses in your notebook.
9. (a) Discuss your observations of gear systems using
different sized gears.
(b) Do your observations support the prediction that
you wrote earlier? Report your conclusions using
evidence from your investigations.
For the Extension Activity: Gear Ratios, please
visit:
www.knex.com/instructions
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79318.
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