How Do Speed and Direction Change for Two Colliding Pool Balls?

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    2d Ball Collision
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Homework Help Overview

The discussion revolves around the physics of two colliding pool balls, specifically focusing on how their speed and direction change upon collision. The original poster describes the initial conditions, including the angles and speeds of the balls, as well as their positions at the moment of collision.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the conservation of momentum in both x and y directions and the assumption of elastic collisions. Questions are raised about the positions of the balls at the moment of collision and the need for conservation of energy in addition to momentum.

Discussion Status

The discussion is active, with participants offering guidance on relevant principles such as conservation of momentum and energy. There is an exploration of different aspects of the problem, including the conditions at the moment of collision and the implications of the assumptions made.

Contextual Notes

Participants note the assumption of completely elastic collisions and the requirement for both momentum and energy conservation to analyze the situation effectively.

kapil1089thek
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I have two balls with d1 and d2 as their direction, and I have the speed s1 and s2, d1 and d2 are in radians showing the angle made with positive direction of x-axis and in anticlockwise direction i.e 0<=d1 and d2<2*pi
their positions are (x1,y1) and (x2,y2) when they collided

after collosion
what would be their speed, and direction?
 
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shouldn't their positions be the same when they collide?

basically you want to split the problem up into two problems: momentum is conserved in both the x and y directions, independently. also it looks like you're assuming completely elastic collisions.
 
Sorry--you will need to use conservation of energy, too.
this plus both equations for conservations of momentum should be enough to solve the problem.
 

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