what is conservation of momentum
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when 2.or more bodies act upon 1 another their total momentum remains constant or conserved which is called conservation of momentum
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Momentum is conserved in any collision if the effect of any external forces present is negliable relative to the effect of the collision. Consider a collision as shown in Figure (6.1).
Figure 6.1: 1-D Collision
Apply the impulse-momentum theorem to m1and m2 separately,
t
=p1 = m1v1f - m1v1i t
=p2 = m2v2f - m2v2i
where  = the average force of m2 on m1 , and = the average force of m1 on m2 . By Newton's third law F1(t) = - F2(t) which gives  = -  and so,
( + )t = m1v1f - m1v1i + m2v2f -m2v2i = 0
p1f + p2f = p1i + p2i.(4)
This is the statement of the conservation of momentum.
Note:
The system must be isolated: the affect of all external forces acting on m1 and m2 must be negligable.
The conservation of momentum holds for a collision involving any number of objects:
Figure 6.1: 1-D Collision
Apply the impulse-momentum theorem to m1and m2 separately,
t
=p1 = m1v1f - m1v1i t
=p2 = m2v2f - m2v2i
where  = the average force of m2 on m1 , and = the average force of m1 on m2 . By Newton's third law F1(t) = - F2(t) which gives  = -  and so,
( + )t = m1v1f - m1v1i + m2v2f -m2v2i = 0
p1f + p2f = p1i + p2i.(4)
This is the statement of the conservation of momentum.
Note:
The system must be isolated: the affect of all external forces acting on m1 and m2 must be negligable.
The conservation of momentum holds for a collision involving any number of objects:
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