Herman Trivilino's latest activity
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.10 kg. -
Herman Trivilino replied to the thread B Simple mass/scale puzzle.See Post #93.
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.Yes. And for those interested about that normal force, it's an upward force exerted on the book by the table, so its 3rd Law partner is...
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.A question asked of prospective physics instructors: A book rests on a level table top. There's a downward gravitational force...
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.Third Law Pairs never act on the same object. String pulls on scale, scale pulls on string. That's a Third Law Pair. The forces acting...
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The two forces acting on the ends of the string are not a Newtons Third Law pair.
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So far nobody formalized it, so let it be me. Let me denote the mass on the left as ##m_1## and the mass on the right as ##m_2##. The...
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Just replace string with spring in the argument. If the spring moves freely, it measures 0. If held stationary, it measures the force -...
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.That is part of the pedagogical point of the original scenario, the other part requires a device for measuring that force. I've seen...
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Going with this idea, consider two rockets with equal thrust pulling on both end of a string. This presents the same ‘seeming’...
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.Because the formula applies to each instance.
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.This is what you said: I don't see that as talking past each other. It's you contradicting yourself. The scale either reads 3 lb or it...
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.##F=mg=(10 \mathrm{kg})(9.8 \mathrm{N/kg}) \approx 100 \mathrm{N}##
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Herman Trivilino replied to the thread B Simple mass/scale puzzle.Nope. I've done this demonstration for students many many times. What difference does it make what pulls with 3 lb of force? It could...
