jbriggs444's latest activity
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jbriggs444 reacted to Herman Trivilino's post in the thread I Topic about physics axioms, theory, laws etc.. with
Like.
Not usually. The special theory of relativity is based on two postulates. I can't think of any other examples of that. It, like all... -
jbriggs444 reacted to Herman Trivilino's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
Correct. Math uses deductive reasoning to reach conclusions. Science uses inductive reasoning. Of course, inductive reasoning doesn't...
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jbriggs444 replied to the thread I Topic about physics axioms, theory, laws etc...While true, this is also somewhat incomplete. Science uses inductive reasoning to guess at broadly applicable principles and equations...
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jbriggs444 reacted to A.T.'s post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
Because we have not tested it under all possible circumstances with unlimited precision, so we cannot be 100% sure that it is always...
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jbriggs444 reacted to A.T.'s post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
The definition of torque? It doesn't make sense to ask whether a definition is correct or not. You could say that a definition is always...
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jbriggs444 reacted to Ibix's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
No. The point is that maths isn't generally about truth, it's about self-consistency. Physics needs self-consistent models, but they...
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jbriggs444 reacted to sophiecentaur's post in the thread B The work done by two objects on each other with Like.
I was always too lazy to perform well in tests but my retention has always been a lot better than people who always got better exam...
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jbriggs444 replied to the thread B The work done by two objects on each other.Of course you are right. First year physics is full of idealizations and simplifications. We usually ignore air resistance. We assume...
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jbriggs444 replied to the thread B The work done by two objects on each other.That sounds plausible in the abstract. Can you make it concrete? For instance, we have a car on a road. The car starts with some...
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jbriggs444 reacted to Herman Trivilino's post in the thread B The work done by two objects on each other with Like.
I think that such a definition is beyond what I can put in a forum post. It wouldn't do justice to the question asked, and would just...
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jbriggs444 replied to the thread B The work done by two objects on each other.No relative motion in the direction of the force. You want the dot product of the relative motion and the force to be zero. The...
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jbriggs444 replied to the thread B The work done by two objects on each other.I'd already distinguished between "center of mass" work and mechanical work. I'd alluded to something else called generalized work. I...
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jbriggs444 replied to the thread B The work done by two objects on each other.What does "amplitude" mean in this context?
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jbriggs444 replied to the thread B The work done by two objects on each other.As @A.T. suggests, the way to combat confusion is with clarity. Not vague handwaving. More handwaving. Show me a scalar and I'll show...
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jbriggs444 reacted to kuruman's post in the thread Variable Mass system : Sand falling into a Freight car with Like.
I grappled with this point when I was putting together the article mentioned in post #2. Eventually I decided to reserve the word...