Linked Questions

8
votes
3answers
69k views

Why is momentum conserved in an inelastic collision and kinetic energy is not conserved? [duplicate]

We know that in an inelastic collision that total momentum of the system before collision equals the total momentum after collision. But total kinetic energy before collision is not equal to total ...
1
vote
5answers
2k views

Why is there no relation between kinetic energy and momentum in collision of two bodies? [duplicate]

The statement that baffles me: During most of the collisions, part of the kinetic energy evolve as heat, nevertheless momentum is still conserved. Ok, the statement may be true. But what confuses ...
6
votes
3answers
759 views

Why does inelastic collision obey the conservation of momentum? [duplicate]

Generally, when an inelastic collision occurs, the nonrelativistic energy of two observable objects is not conserved because some energy has been transformed into other forms such as heat and sound. I ...
0
votes
1answer
4k views

Loss of kinetic energy in inelastic collision [duplicate]

I know that momentum and energy are always conserved in collisions, but if we have a perfectly inelastic collision in which an object sticks to another object $m_1 v_1 + m_2 v_2 = (m_1+m_2)v_{12}$, ...
0
votes
2answers
826 views

In Inelastic collision, momentum is conserved while Kinetic Energy is not, Why? [duplicate]

First of all, I tell you that I know there is same question available which is already answered, but no answer cleared my doubt, that's why I am asking the question in more detail. Let there be a ...
-1
votes
3answers
563 views

How is it possible that momentum is conserved but kinetic energy is changed? [duplicate]

A simple maybe 8th or 7th grader question, but I can't really get over it. Elastic collision: momentum is conseved and so is the kinetic energy whereas in an inelastic collision, momentum is conserved ...
2
votes
1answer
264 views

Why doesn't the momentum of the system change after an inelastic collision? [duplicate]

What I know: Wen an inelastic collision takes place the momentum of the two objects before the collision: m1 * v1 + m2 * v2 is equal to the momentum of the objects after the collision: (m1 + m2) * u ...
1
vote
2answers
82 views

Are both kinetic energy and momentum conserved when 2 objects undergo a collision? [duplicate]

for example when two objects undergo a collision and no external force is acting on them. Will both kinetic energy and momentum be conserved or just momentum?
1
vote
0answers
46 views

Why should energy change with mass? [duplicate]

At void, an object with velocity v, mass m collides with an object with the same mass m at rest. Let's assume that they were connected to each other(the instant after the collision). then it would be ...
0
votes
0answers
44 views

How is linear momentum conserved after collision while part of linear kinetic energy contributes to angular kinetic energy [duplicate]

Referring to the famous example of a horizontally moving sticky ball that collides (and sticks) at the tip of a vertically floating rod, then the combination moves along the ball's incident course ...
4
votes
5answers
32k views

Conservation of momentum but not kinetic energy in inelastic collisions

In inelastic collisions, the kinetic energy of the system is not conserved but the momentum is. Kinetic energy is: $0.5 \times \text{mass} \times \text{velocity}^2$. Momentum is: $\text{mass}\times\...
3
votes
8answers
1k views

Does momentum change when Kinetic energy changes?

$K.E=\frac{1}{2}mv^2$ , $P=mv$ thus there is a relation between them. I really can't understand why there is no decrease in momentum when kinetic energy is decreased in an inelastic collision. I am ...
0
votes
2answers
2k views

Momentum and Kinetic Energy Conservation in Inelastic Collision

Let a ball fall freely to the ground, hit and bounce back. Assume mass of the ball does not change during this. Since momentum is conserved in all collisions, $p_i = p_f$ In this example, the system ...
-1
votes
1answer
1k views

What happens to momentum when a car crashes into a barrier? [duplicate]

The law of conservation of momentum states that the total momentum in a closed system is conserved. When a car crashes into a barrier, the barrier and the car may crumple but the car will come to a ...
0
votes
5answers
197 views

Why can we still assume momentum is conserved in an inelastic collision?

This is very similar to this question: How can momentum but not energy be conserved in an inelastic collision? However, I feel as though an important caveat was not resolved for me which is why I am ...

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