Collision: Momentum, Kinetic Energy & Potential Energy

  • Context: Undergrad 
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    Collision Energy
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Discussion Overview

The discussion centers on the relationship between momentum, kinetic energy, and potential energy during collisions, particularly in the context of a ball rolling down an inclined surface and colliding with another ball. The scope includes conceptual understanding and the transformation of energy forms during motion.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why potential energy is not considered in discussions about collisions, specifically in the context of a ball rolling down an incline.
  • Another participant asserts that potential energy is transformed into kinetic energy before the collision occurs.
  • A third participant emphasizes that at the moment before the collision, the kinetic energy is at its maximum and potential energy is effectively zero, suggesting that potential energy is not relevant at that point.
  • A later reply suggests that working through the derivation of energy transformations may help clarify the role of potential energy in this scenario.

Areas of Agreement / Disagreement

Participants express differing views on the relevance of potential energy in the context of the collision, with some asserting its transformation into kinetic energy while others question its absence in the discussion of collisions.

Contextual Notes

There are assumptions regarding the definitions of potential and kinetic energy, as well as the conditions under which they are considered relevant in the context of motion and collisions.

astro2cosmos
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in collision we all talk about only momentum and energy. but which form of energy only kinetic no sign of potential energy.why??
suppose a ball is rolled from top of a inclined surface at height L from ground and hit another ball placed at bottom of inclined surface, there occurs a collision b/w these balls. so how the potential energy is implemented in this event?
 
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In your example the potential energy has been transformed to kinetic energy before the collision takes place.
 
remember whenever a body starts motion, its potential energy is converted into kinetic energy.
At the point before the collision, the kinetic energy of the body is maximum while the potential energy is said to be zero. So, no potential energy can be implemented.
You can start considering potential energy when the ball starts to come into rest, and its motion is somehow decreased.
 
Ali Inam's response is exactly correct, however, it would probably be helpful for you (astro2cosmos) to work through the derivation including the terms you think are missing and see what happens. This is the only way you'll ever be convinced that they don't matter.
 

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