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You're going to have to formulate your questions.......
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Posted by zeke (more from zeke) on Wed, 12 Dec 2001 11:56:13 Share Post by Email
In Reply to: brake pad physics, nt moore, Wed, 12 Dec 2001 10:04:21
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better! The kinetic friction coefficient that BillJ gave sounds
ball-parkish, but I'm not sure if pressure applied at the brake
pedal will do anything. The pressure at the pedal is simply the
force one applies divided by the area it's applied to - if the bottom
of your shoe makes a completely flat imprint on the brake pedal, I would
guess a force of 200 lbs, say, is applied to an area about 8-10 sq. in,
maybe 20 lbs a sq. in. at the brake pedal. The hydraulic forces get
magnified by the time the piston inside the caliper presses the pads
against the rotors. I'm not sure how much that magnitude is - someone
else on the board will probably know. However, I think an analysis
could be done solely at the wheel to give a pretty good indication.
Just look at the forces overcoming the inertia of the total vehicle
relative to the kinetic friction forces at the tires. Assume a given
speed and develop an equation that takes into account the kinetic coeff.
with sliding at the instant the brake was applied. I would think the
hard part is coming up with an equation that describes, approximately,
the forces involved in slowing the vehicle with no slipping - you'd have
to take not only linear, but rotational inertial forces into account.
I've always found it was a good idea to solve the problems before I
give them to my students! I'm guilty of not heeding my own advice,
sometimes.

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