quote:
Originally posted by MC.POP
when u first said the first quote that means the same object going forwards then backwards but when u said about the car and fly that is collision ans ia whole different thing 
nope, it is exactly the same thing: reaction of forces on each other.
laws:
"for every action there is a reaction"
"a force will not dissepear by itself, it has to go somewhere"
quote:
Originally posted by spokes
ok i read somewhere that you cannot go from forward motion to backward motion without stoppin (even if its for the smallest amount of time).
so if that top part is true then this below should be true
if a fly hit your car window, it would splatter and start goin backwards? but doesnt it have to stop first?
meaning it would stop the whole car (for small time) otherwise smash the windscreen?
just wondering, me and my friend are having a debate about it, lol
You actualy already know the correct answer
It IS indeed true that it is impossible to go forward and immediatly go backward without stopping.
This is a nature law. If you want to turn the positive force around which makes you go farwards, at one point the force will be 0 (stopped), before it will be negative (backwards).
This is also true for the fly!! The fly _indeed_ slows the car down!!! But the force that the fly has is so small compared to the force of the car that it is as good as 0 (but not completely 0!)
######force car######> <..force fly..
eg: Fc = 10000 Ff = 0.1
####force car####><force fly
eg: Fc = 10000 - 0.1 = 9999.9 Ff = 0
=> the car slowed down because the forward force has been reduced by the forward force of the fly
This nature law is simply called "Action/Reaction". For every action there is an opposite reaction
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