Define law of conservation of momentum?

Answer 1

Total momentum in an isolated system does not change.

the law of physics that states that the linear momentum does not change unless an external force acts upon it

The law of conservation of momentum explains that momentum is neither lost or gained.

"when two bodies collide with one another, the total energy remains constant"

I COULDN'T SAY IT BETTER!

That means that the total amount of momentum doesn't change. This is relevant, for example, in a collision or Newton's Cradle. (5 balls hanging on a string, when you move one to hit the other balls, there is a reaction.)
"In closed system,when two bodies colloid,the total momentum before collision is equal to the total momentum after collision".

A B. A. B. A. B

->. ->. -> ->. ->. ->

⊙ ⊙ ⊙⊙ ⊙ ⊙

Consider two bodies A and B of masses m1 and m2 moving with velocities u1 and u2 respectively along the same direction.let the bodies colloid for 't' secs.

During the collision A exerts a force F1 on B ans B exerts an equal and opposite force F2 on A. After collision A Moves with a velocity V2.

Applying newtons second law motion ,the force exerted by the boo body B is:

F1=mass of B (acceleration of B)

(v2-u2)

F1=m2(----------).......1

t

Similarly force exerted by the body B on A is:

F1= mass of A (acceleration of A)

(V1-u1)

F2= m1(-----------) . ........2

T

What is neat about momentum is that even if the collision is not elastic, so that kinetic energy is lost to heat, etc., the momentum is yet preserved!

Answer 2

There is a quantity, called momentum (velocity x mass), that is conserved in a closed system - one that doesn't have contact with the outside. Note that both velocity and momentum should be treated as vectors - for example, if one object moves to the right, and another of equal mass moves with the same speed to the left, the total momentum of the two is zero.

Answer 3

The law of conservation of momentum states that the total momentum of a group of objects does not change unless outside forces act on the objects.

Answer 4

In the absence of an external force, the momentum of a system remains unchanged

Answer 5

In classical mechanics an isolated system with net external force equal to zero has a constant total momentum. It is a result you can get by applying Newton's third law to such a system.

Answer 6

An object in motion tends to stay in motion at a constant speed and direction, unless some force acts upon it to change its speed and/or direction.

Answer 7

if no external force acts on a closed system of objects, the momentum of the closed system remains constant

Answer 8

friction 8=> >