Elastic Collision in Deep Space

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Homework Help Overview

The problem involves an elastic collision between two objects of equal mass in deep space, where one object is initially at rest. The discussion focuses on determining the final velocities of both objects after the collision, the timing of minimum kinetic energy, and the forms of energy involved in the process.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the final velocities of the objects and question the validity of initial intuitive answers. They explore the sequence of events during the collision and the nature of energy conversion, particularly in an ideal elastic collision scenario.

Discussion Status

The discussion is active, with participants providing feedback and prompting further exploration of the concepts involved. Some guidance has been offered regarding the need for equations to validate claims, and there is an ongoing examination of the conditions under which kinetic energy might be minimized.

Contextual Notes

Participants are considering the implications of an ideal elastic collision in a vacuum, questioning the assumptions about energy conversion and the nature of motion during the collision.

Rookie
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Hello! I need help with this physics problem, I've some what attempted it and I need some feedback. ANY help would be awesome!

Homework Statement


Two objects (A and B) of equal mass, undergo an elastic collision in deep space. Initially, B is at rest and A approaches at velocity v. The duration of contact is 2 seconds.

(a) What is the velocity of object A after the collision (final velocity)?
(b) What is the final velocity of B?
(c) At what time is the kinetic energy of the two object system a minimum?
(d) What has the kinetic energy been converted to?

Homework Equations


The Attempt at a Solution


(a) A velocity is 0.
(b) B velocity is equal to A initial velocity, v.
(c) I don't know :|
(d) Momentum (not sure).
 
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Hi Rookie,

a,b) Your answers seem intuitive and while they could be right you need to use equations to validate your claims.

c) What is the sequence of events of the elastic collision? This can help you understand the question.
d) What can Kinetic Energy convert into?
 
c) Would it be at the middle of the collision, 1 second? Where minimum there is no relative motion, I think?
d) Sound energy and thermal energy?
 
c) That is where it should be in ideal conditions.
d) Well those are true but do not happen in space during an assumed ideal elastic collision. What else can store energy in this setup?
 
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Ahh is it internal energy?
 

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