Toymods Car Club Inc: The Outhouse => Physicist please read.

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hickoz_bro
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Brisbane
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October 2004

Re: Physicist please read.	Fri, 08 April 2005 09:24

T APLUS 22:- firstly i defend my arrogance, by saying, i never stated that "stupid" is bad... lol... i love stupid, it's what i live for, that's why i bothered replying, anyhow, i didn't quite follow what you said about KIM, okay, lets break this up into teeny tiny bits... we have the ball, barrys arm, and the earth.. the ball exerts a force on barrys hand (downwards) this force is supplied by the earth (gravity). it also exerts gravitational forces of its own, but having such a small force we call this force... tiny, little... insignificant, same is the case with barrys hand. barrys hand exerts a force on the ball, (supplied by his copius muscles ) this force must be equal to the WEIGHT* (not mass) of the tennis ball AND his hand/arm, in order to hold the ball steady. this is called equilibrium. all the down forces equal all the up forces. gravity x (mass of arm + mass of tennis ball) = Force exerted by bazza's arm. now, in order for the tennis ball to leave bazza's hand he needs to create an unstable system, here we have two options he can either increase or decrease the force applied to the ball. in this case he'll increase the force, but what happens here, is as he increases the force, the reaction force increase, since the downward force on the ball increases (gravity + resistance to accelleration) so in order to accellerate the ball barry needs to overcome the new system of forces, which changed the system of forces, and this is why we have an unstable system, basically he needs to supply a force greater then the combined gravity and resistance forces so as to make the ball go fast... once the ball leaves bazza's hand, there remains only one force on it, gravity, which means the ball slows down, comes to a stop, then accellerates up again, until it hits barry. the key to newtons laws are that they work ONLY in a stable system, ie equilibrium. if every force had an equal and opposite reaction force, then nothing would accellerate ever, and we'd never enjoy such delights as twin turbos THE WITZL:- lol... i hadn't seen any "Kath & Kim" connection until you pointed it out then *Weight is defined as the MASS multiplied by the Force due to Gravity... Mass is constant, reguardless of environment (moon, or earth) apologies to all those who are acctually worse off after reading that [Report message to a moderator]

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