Oblique Collisions


by jsmith613
Tags: collisions, oblique
jsmith613
jsmith613 is offline
#1
Apr17-12, 08:02 PM
P: 614
In an oblique collision (when one object hits another object of IDENTICAL mass at a slight angle the two objects move at right angles to each other.

my book says

p2 = p12 + p22

For momenum conservtation:

p= p1+ p2

apparently these equations can only be consistent of the collision occurs at right angles. why?
Phys.Org News Partner Physics news on Phys.org
Physicists consider implications of recent revelations about the universe's first light
Vacuum ultraviolet lamp of the future created in Japan
Grasp of SQUIDs dynamics facilitates eavesdropping
haruspex
haruspex is offline
#2
Apr18-12, 01:46 AM
Homework
Sci Advisor
HW Helper
Thanks ∞
P: 9,205
These are vectors, right?
p.p = (p1+p2).(p1+p2) [2nd equn]
= p1.p1 + 2.p1.p2 + p2.p2
= p.p + 2.p1.p2 [1st equn]
Hence p1.p2 = 0
jsmith613
jsmith613 is offline
#3
Apr18-12, 03:54 AM
P: 614
Quote Quote by haruspex View Post
These are vectors, right?
p.p = (p1+p2).(p1+p2) [2nd equn]
= p1.p1 + 2.p1.p2 + p2.p2
= p.p + 2.p1.p2 [1st equn]
Hence p1.p2 = 0
where has p2.p2 gone in the final line
surely the final line should be
= p1.p2 + p2.p2, no?

haruspex
haruspex is offline
#4
Apr18-12, 05:25 PM
Homework
Sci Advisor
HW Helper
Thanks ∞
P: 9,205

Oblique Collisions


1st equn says p.p = p1.p1 + p2.p2
To get from my second line to my third line, use this to substitute p.p for p1.p1 + p2.p2.


Register to reply

Related Discussions
Elastic Collisions (Oblique Impact) General Math 1
Oblique collisions between non-sliding surfaces Classical Physics 1
Oblique collisions General Physics 6
Oblique Elastic Collisions Introductory Physics Homework 2
Billiard Ball Problem - oblique collisions. Classical Physics 0