Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: dedaNoe on 07/04/2007 10:13:38

Title: this is where newton 3 falls 3 times
Post by: dedaNoe on 07/04/2007 10:13:38

F_action=-F_reaction that's newton 3

F_actionD_action=F_reactionD_reaction the lever law

F_actionS_action=F_reactionS_reaction the law of hydraulics (S = surface)

F_actionV_action=F_reactionV_reaction the law of impacts (V = frontal volumetric compression)

how can newton 3 be equally right with this 3 laws?

Title: this is where newton 3 falls 3 times
Post by: lightarrow on 07/04/2007 18:08:20

Because those 3 laws are wrong.
You misunderstood the meaning of  "F_action"  and  "F_reaction".

Title: this is where newton 3 falls 3 times
Post by: dedaNoe on 07/04/2007 19:04:28

ok then show me what newton 3 means?

Title: this is where newton 3 falls 3 times
Post by: DoctorBeaver on 07/04/2007 21:15:16

Surely Newton 3 is Faction=-Faction or Faction=Freaction not Faction=-Freaction

Title: this is where newton 3 falls 3 times
Post by: dedaNoe on 08/04/2007 03:06:14

ok then how does it obey the lever law?

newton 3 is a Jewish way of saying "an eye for an eye - tooth for tooth". the leverlaw works in more general and profound way "my eye for your tooth just like your eye for my tooth"

Title: this is where newton 3 falls 3 times
Post by: lightarrow on 08/04/2007 20:18:30

Quote from: dedaNoe on 07/04/2007 19:04:28

ok then show me what newton 3 means?

Newton 3 is correct in that form. What is not correct are the other 3 laws you have written. (Did you read well my post?)
Example: you put a heavy body on a lever. The action is the body's weight. The reaction...is not what you have written. It's the elastic force the lever makes on the body.
Ecc.