Subject:
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Re: Shame, Shame...."plastic" rubber tires in new technic
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Newsgroups:
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lugnet.technic, lugnet.edu
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Date:
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Wed, 10 Jan 2001 18:44:54 GMT
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Viewed:
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2311 times
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Howdy,
Never sat down and figured out the friction coefficient for the different LEGO tires. However,
over the years I have hosted numerous "hill-climb", "King of the Hills", "Tug of War" and "Tractor
Pull" type contests. Usually, kids will grab the largest tires available! They would catch on pretty quick
that different tires would grip better, and how well they were gripping was unrelated to size.
The next logical step in a classroom would be to follow up and calculate how much "grab" different
wheels have! Thanks!
Richard
rwright@pcsedu.com
Miles Gentry wrote:
> The plastic wheels work well when you cannot use a clutch gear or pulley
> belt to protect a motor from excessive resistance. Rrubber wheels do not
> yield well on some driving surfaces when an obstacle stops the vehicle.
> Plastic wheels spin and, so, protect the motor.
>
> Comparing the friction of rubber wheels to plastic wheels might make a good
> educational demonstration. The plastic 30.4x14 wheels have the same
> dimersions as the rubber wheels in many sets, eg, 8735. The comparisons
> could include both motor-driven and gravity-force tests. The Dacta Wheels &
> Axles set explains how to compare wheels of different diameter on vehicles
> rolling down a ramp. You could also compare the results of the rubber vs
> plastic wheels.
>
> In lugnet.technic, John Heins writes:
> > [snip] The 8241 Battle Cars has PLASTIC wheels that look like the
> > standard rubber tire/plastic hub found in earlier kits (30.4x14 size). It is
> > NOT obvious looking at the box cover photos. I picked this set up because
> > I teach "enrichment" courses (simple machines, robotics) at my sons' elem.
> > school using DACTA, Technic and Mindstorms materials and I can always use
> > more wheels, gears and such. Plastic wheels do NOT work as drive wheels >on powered cars - no traction. [snip]
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