sciman55 Posted August 14, 2005 Report Share Posted August 14, 2005 I have been wondering; even though laws are unbreakable, I am curious. What would be considered breaking Newton's second law (F=ma)? So far,I have this website that tells me. http://www.gottapost.com/pmwiki/pmwiki.php/Main/BlownAcrossTheRoom But I am not quite sure. Can anyone tell me? Quote Link to comment Share on other sites More sharing options...
C1ay Posted August 14, 2005 Report Share Posted August 14, 2005 That is not what the website is telling you. It is disproving one of TVs effects. In many shows you will see someone fly backwards when hit by a bullet but not the shooter that fired the bullet. That is what violates the law which says that for every action, there is an equal an opposite reaction. Quote Link to comment Share on other sites More sharing options...
sciman55 Posted August 14, 2005 Author Report Share Posted August 14, 2005 Okay, maybe not. I was paying attention to the words "newton's second law" in the site. But are there any violations of the law? Quote Link to comment Share on other sites More sharing options...
sciman55 Posted August 14, 2005 Author Report Share Posted August 14, 2005 I mean examples? Quote Link to comment Share on other sites More sharing options...
C1ay Posted August 14, 2005 Report Share Posted August 14, 2005 only in science fiction..... Quote Link to comment Share on other sites More sharing options...
sciman55 Posted August 15, 2005 Author Report Share Posted August 15, 2005 In science fiction? I'm guessing that would be the inertialess drive form lensmen (or whatever) that violates the second law, is it? Or is that some other drive or device? Anyways, if the second law were violated, to me, the acceleration would go in a different direction different from the net force (the acceleration's direction is the same as the net force). How would the law be violated in terms of mass and the net force's magnetiude? Quote Link to comment Share on other sites More sharing options...
EWright Posted August 15, 2005 Report Share Posted August 15, 2005 Perhaps it would make more sense to you to look at it as ma=F, instead. :lol: Quote Link to comment Share on other sites More sharing options...
UncleAl Posted August 15, 2005 Report Share Posted August 15, 2005 The cited web page is mocking "movie physics." BTW, guns with muzzle brakes don't have much kick. It isn't the bullet f=ma, it is the hot gas rushing out like a rocket behind it that causes most of the kick. /_P/_V=energy, 101.325 J/liter-atm. Car in neutral gear on flat ground. Try it lift it - that's gravitational mass F = G(m_g)M/r^2 sucking it to the Earth's center. Try to push it - that's inertial mass F = (m_i)a resisting a change in velocity over time. Now, drop stuff in vacuum. If (m_i)/(m_g) is not exactly identical for everything, free fall accelerations will be different. However, the Equivalence Principle is true to measured one in ten trillion difference/average for everything examined to date. F=ma is empirically true. Quote Link to comment Share on other sites More sharing options...
brianthepoet Posted August 15, 2005 Report Share Posted August 15, 2005 I don't know what the 2nd law is - (in words, that is) but I worked out a fourth law, based on energy being strings. When a force is applied to an object, it remains with that object, and adds to its mass. Thank God there is only one infinity! (Brianthepoet) Quote Link to comment Share on other sites More sharing options...
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