I have a stupid professor and need clarification on Newtons 2nd law

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Discussion Overview

The discussion revolves around Newton's second law and its implications regarding acceleration and net force, particularly in the context of constant velocity scenarios. Participants explore the relationship between force, acceleration, and motion, while also addressing the teaching effectiveness of the professor in question.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Meta-discussion

Main Points Raised

  • One participant asserts that constant velocity implies zero acceleration, leading to a net force of zero in any force problem.
  • Another participant agrees, explaining that a net force results in acceleration, and that an object can maintain constant velocity with no net force acting on it after an initial force is applied.
  • A third participant connects this to Newton's first law, using the example of a tossed ball to illustrate the concept of inertia and the role of gravity.
  • One participant questions the characterization of the professor as "stupid," suggesting that the issue may lie in the teaching style rather than the content.
  • Another participant suggests that the professor's succinctness in explanations might require careful attention from students.
  • A later reply raises questions about the professor's teaching methods, including the clarity of definitions, examples provided, and the overall effectiveness compared to other instructors.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of the professor's teaching methods, with some defending the professor's approach while others criticize it. The technical discussion about Newton's laws appears to have some agreement, but the overall effectiveness of the teaching remains contested.

Contextual Notes

Participants express uncertainty regarding the professor's teaching style and its impact on student understanding. There are also assumptions about the clarity of the textbook and the comparison of class performance metrics that remain unresolved.

pmangs06
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So is it true that if you have a constant velocity therefore you have no change in acceleration so A=0 and if you have no acceleration then you have no Fnet? And is that the case in ANY force problem?
Thanks!
 
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More or less. A net force results in an acceleration, and no net force is 0 acceleration, which includes constant velocity situations. Technically, you could exert a force that accelerates an object to a certain velocity and then stop exerting the force; you now have an object at constant velocity with no net force (or a net force of 0N) acting on it.
 
AKA that's the whole idea of Newton's first law or the idea of inertia. Like if you toss a ball in the air, your hand no longer exerts a force on the ball but gravity acts on it therefore it has to come back down otherwise it would keep going.
 
I fail to see how this makes your professor stupid.
 
...because he didn't actually teach me any of this and I had to learn basic concepts, like this, all on my own because he can't keep on the same train of thought for more than 1 minute so he never fully develops the full idea we are supposed to be learning.
 
Sounds more like he is succinct in his explanations. Follow EACH word he says very carefully..:smile:
 
pmangs06 said:
...because he didn't actually teach me any of this and I had to learn basic concepts, like this, all on my own because he can't keep on the same train of thought for more than 1 minute so he never fully develops the full idea we are supposed to be learning.

Hard to know, since we do not attend your class. Does he state a definition, explain a concept, give maybe 2 examples? Review the examples in class? Is your textbook smart and sensible (like the kind as Sears, Zemansky, & Young)? How has the drop rate been in your class, and how does this compare to classes of the same course taught by other professors?
 

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