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Results tagged with newtonian-mechanics
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user 198521
Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].
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Is friction a product of Newton's third law?
I know this post is coming way too late, but I think the underlying confusion behind the question is one involving fundamental forces. The question was whether friction, in a case like a hand sliding …
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Scale readings, the definition of weight, and projectiles
For this question I would like to define weight as a scale reading. I have a conceptual question: if I leap off a scale, according to my definition of weight the scale will claim I am heavier than nor …
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Work and walking with a bowling ball
I want to check myself on some basic things: Assume I am holding a heavy bowling ball straight out in front of me. And assume that when I walk I am able to carry the ball in such a way that it strictl …
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Basic question about a point mass and the geometry of a general trajectory
Just to ruin the punchline upfront: With this question, I'm trying to do a sanity check about the logic of insisting on a trajectory and only then thinking about forces.
I took Classical Mechanics wi …
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Newton's laws vs energy for solving a problem
I have a problem I solved using kinematics/Newton's 2nd law.
It gives the mass of a walker as 55kg. It then says she starts from rest and walks 20m is 7s. It wants to know the horizontal force ac …
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Newton's laws vs energy for solving a problem
It occurred to me that since $\vec{v}=at\hat{i}$, it is clear that $v_{final}=2v_{average}$. Well, since $v_{average}=\frac{|\Delta\vec{x}|}{t_{total}}$, we know that $v_{final}=2v_{average}=\frac{2|\ …
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System of two masses interacting and the notion of work [closed]
Assume an isolated system consisting only of the earth and a basketball interacting through the gravitational force: No air, no other planets/stars etc. Are the following statements accurate?
The to …
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Path independence in a gravitational field
In all of the below remarks, I am considering an object (a "mass") moving around above the surface of the earth.
What are some physical examples of situations that demonstrate path independence in a …
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Path independence in a gravitational field
Hopefully you will forgive me for posting an answer to my own question. But I have thought about it and I feel the answer could be (and I hope to receive feedback on this answer!):
In the perfect tex …
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2
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Internal work in system made up of a ball and the earth
Assume I am considering my system to be the earth, a ball, and the gravitational interaction between them. No air resistance. Assume the ball has a nonzero initial velocity upward. I understand there …
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