Understanding Momentum & Force: Self-Studying Physics Tips

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Discussion Overview

The discussion revolves around understanding the concepts of momentum and force, particularly in the context of Newton's Laws of motion. Participants share their experiences with self-studying physics and seek clarification on these fundamental concepts, exploring both intuitive and technical interpretations.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses difficulty in grasping the concepts of force and momentum, noting that they can solve numerical problems but struggle with deeper understanding.
  • Another participant describes momentum as the amount of motion an object has, emphasizing its role in collisions and the idea that momentum is conserved.
  • A different viewpoint suggests that the conservation of momentum is the most critical aspect, likening it to the conservation of energy for making predictions.
  • One participant humorously suggests that momentum is not always conserved, prompting a request for examples to clarify this point.
  • Another participant refines the definition of force, stating that the rate of change of momentum equals net force, and describes impulse as the integral of contact force over time.
  • There is a mention of the importance of understanding momentum in relation to both mass and velocity, as illustrated through examples of collisions involving different objects.

Areas of Agreement / Disagreement

Participants generally agree on the importance of momentum conservation, but there are differing interpretations regarding its application and whether it is always conserved. The discussion remains unresolved with multiple competing views on the nuances of these concepts.

Contextual Notes

Some participants express uncertainty about their understanding and the effectiveness of their study methods, indicating potential limitations in their grasp of the material. There are also references to the need for clearer definitions and examples to aid comprehension.

Who May Find This Useful

This discussion may be useful for individuals self-studying physics, particularly those struggling with foundational concepts like force and momentum, as well as those seeking different perspectives on these topics.

Sqrt
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Hey,

Just started studying this chapter and everything is just floating around my head.
I am self studying Newton's Laws of motion and I'm having trouble imagining and getting used to it. Like i can't get a feel of force or momentum. I hope you get what I mean even though it sounds wired.
You know like one would clearly know what velocity and acceleration is.So what I made out is Force is the rate of change of momentum, and impulse is the change in momentum.

I can use the formulas and the equations of motion to solve most of the numericals in the beginning.

But i really love physics and I like to properly understand things from the core up, but unfortunately my brain can't interpret these concepts.

Can you please tell me how you interpret these concepts physically and make sense of them all.I'd like to squeeze in a quick question: What's the best way to self study physics to master concepts like be really good and be able to solve all the problems. Like I am ready to put in as much time and effort it takes and sacrifice anything I have to. The current way I do it I end up with a lot of doubts which takes 2-3 days to understand on my own.(the reason why i came here to reduce that) and if a tough problem comes which I haven't practiced before I am not really able to solve it indicating my concepts aren't really that clear which implies to the fact that I have a fault in my study structure.

Thanks.
 
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From an intuitive standpoint momentum is the amount of motion an object has, in terms of being able to transfer that motion in a collision. So if a car runs into you going 100 kph you are going to be moved much more than if the same car runs into you going 1 kph, the faster car has more momentum. Similarly, an insect running into you at 100 kph will move you less than a car at the same speed, the more massive object has more momentum.

The most important thing about momentum is that it is conserved.
 
Dale said:
The most important thing about momentum is that it is conserved.
I would even say, that's all there is to momentum. Just like with energy we found a conserved quantity, which is useful to make predictions.
 
Dale said:
he most important thing about momentum is that it is conserved.
sometimes:)
 
Several off topic posts and responses have been removed.
 
Sqrt said:
Hey,

Just started studying this chapter and everything is just floating around my head.
Im self studying Newton's Laws of motion and I'm having trouble imagining and getting used to it. Like i can't get a feel of force or momentum. I hope you get what I mean even though it sounds wired.
You know like one would clearly know what velocity and acceleration is.So what I made out is Force is the rate of change of momentum, and impulse is the change in momentum.

In my judgment, a better way of saying this is that rate of change of momentum is equal to net force. Impulse is contact force integrated over time.
 
Do you mean it's not always conserved? Could you please give an example? Thanks guys for the intuition on those concepts, so from what you said Dale, Momentum is a quantity that defines 2 important aspects of Motion together for analysis,

and thanks Chester-miller that one line on impulse is more self-explanatory than the whole paragraph in my book .
 
Chestermiller said:
rate of change of momentum is equal to net force.
While an individual force represents a transfer of momentum.
 

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