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A movinng object will not change momentum unless a force acts upon it.

A force could be supplied by many things including a collision, gravity, friction

What evr happens, energy will be conserved. If friction through air reduces a body's momentum, then the momentum of the of the body will be transfered to momentum of the air particles (which is ultimately seen as heat, and is infact an increase in speed and hence momentum of the molecules

Q: What will happen to the momentum of a moving object if stops without any collision?

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Conservation of Momentum:The total momentum in a closed or isolated system remains constant. If the two trains are moving as one after the collision, and were the same mass M each, the total momentum before and after the collision would be the same, ccording to the law. Before the collision, the momentum (velocity times mass) was 10 x M units (one train) which must now be the same but applied to two trains (2M) moving as one body. The Conservation of Momentum rule, will tell you that the new moving body, being twice the mass, would be moving half the velocity to conserve the momentum from before the collision.

Elastic collision: objects bound against each other after the collision. - One is moving and the other is at rest. - Both objects are moving. Inelastic collision: objects stick together after the collision. - One is moving and the other is at rest. - Both objects are moving.

Momentum will be conserved (it always is conserved). If the cars also move at the same speed, and the collision is inelastic, they will both stop completely.

This can happen if they move in opposite directions, and the sum of their momentum is zero. For example, before the collision one may have a momentum of 100 kg x meter / second to the right, and the other 100 kg x meter / second to the left. Thus, their total momentum before the collision would be zero; therefore this would be no problem from this point of view, since the total momentum after the collision is obviously also zero. From the point of view of conservation of energy, mechanical energy is often lost in collisions; most of such energy is converted into heat energy.

The idea is to use conservation of momentum. Calculate the total momentum before the collission, add it up, then calculate the combined velocity after the collision, based on the momentum.

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By the Law of Conservation of Momentum, the total momentum after the collision must be the same as the total momentum before the collision.

Conservation of Momentum:The total momentum in a closed or isolated system remains constant. If the two trains are moving as one after the collision, and were the same mass M each, the total momentum before and after the collision would be the same, ccording to the law. Before the collision, the momentum (velocity times mass) was 10 x M units (one train) which must now be the same but applied to two trains (2M) moving as one body. The Conservation of Momentum rule, will tell you that the new moving body, being twice the mass, would be moving half the velocity to conserve the momentum from before the collision.

Elastic collision: objects bound against each other after the collision. - One is moving and the other is at rest. - Both objects are moving. Inelastic collision: objects stick together after the collision. - One is moving and the other is at rest. - Both objects are moving.

Law of Conservation of Momentum: The total momentum after the collision is equal to the total momentum before the collission.

Momentum will be conserved (it always is conserved). If the cars also move at the same speed, and the collision is inelastic, they will both stop completely.

Their combined momentum will be equal to the first boxcar's original momentum before the collision.

This can happen if they move in opposite directions, and the sum of their momentum is zero. For example, before the collision one may have a momentum of 100 kg x meter / second to the right, and the other 100 kg x meter / second to the left. Thus, their total momentum before the collision would be zero; therefore this would be no problem from this point of view, since the total momentum after the collision is obviously also zero. From the point of view of conservation of energy, mechanical energy is often lost in collisions; most of such energy is converted into heat energy.

== == Momentum is the product of the mass of an object multiplied by its velocity (or speed). Momentum is conserved so if a moving object hits a staionary object the total momentum of the two objects after the collision is the same as the momentum of the original moving object.

Consevation of momentum applies. The final compond mass must have the same momentum as the net momentum of the two balls before the collision. Remember, momentum is a vector and direction is important. For example if the two balls are moving toward each other with the same momentum, the net momentum is zero because they are moving in opposite directions. So the compound ball will not move. Or, if ball 1 is moving left and has a greater momentum then ball 2 ,moving right, then the compound ball will move left. Its momentum will equal the difference between the two momentums because when you add two vectors in opposite directions you subtract their magnitudes. Mechanical energy (potential + kinetic) is not conserved in this collision because some mechanical energy is lost as heat in the collision.

More or less. Actually, a moving object has momentum - defined as mass times velocity. The word "impulse" is used for transfer of momentum, for example, in a collision. It has the same units as momentum, but the use of the word "impulse" seems inappropriate in this context.

The idea is to use conservation of momentum. Calculate the total momentum before the collission, add it up, then calculate the combined velocity after the collision, based on the momentum.

No, two cars traveling at the same speed will not come to rest at the point of impact in a frontal collision. The impact will cause both cars to decelerate rapidly, but they will continue to move forward after the collision due to the conservation of momentum. The final resting positions will depend on the specific details of the collision.