# Questions tagged [collision]

Interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved.

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### Why is the center of mass the pivot of rotation?

Suppose a ball moves horizontally to the right and hits a vertical stick at a position closer to its upper end. I understand intuitively, the stick will have linear and angular momentum, and that it ...
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### Calculate impact force. when A beam starts to fall down with one end hinged and hits an object [closed]

A beam of 10 Kg and length 12 meter starts to fall from initial vertical position with one end hinged. When Beam's center of mass is dropped 5 meter from earlier position, Beam hits an object with ...
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### Rotating triange colliding with wall

Imagine a freely moving equilateral triangle in the x-y plane with a given velocity $\vec v$ rotating around the z axis at its center of mass with an angular velocity $\vec \omega$. Now this triangle ...
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### Could we make a orbital kinetic strike weapon big enough to destroy a city? [closed]

i was playing call of duty ghost recently and i realized they were using a kinetic orbital strike weapon and i was just wondering if it would be possible and effective at the same time I've watched a ...
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### Black holes and FTL particles [duplicate]

I Was wondering, since a black hole generates enough gravitational pull to overpower light speed, does that mean anything in a black hole past the event horizon travels ftl? If 2 black holes each ...
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### Calculate maximum force in elastic collision between carts

Consider two carts, one of mass $m_1$ moving frictionless to the right with velocity $u_1$ and then colliding elastically with a second cart with mass $m_2$ initially resting $u_2 = 0$. Since the ...
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### How to determine if two objects collide or not using maths? [closed]

Imagine any two objects in space among which one is in motion while the other in rest and let's suppose that they move towards each other. Now can one say that the objects collide with each other if ...
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### How is momentum conserved during the short period of time during collision when there is no kinetic energy and only potential energy?

We know that in an elastic collision , momentum of the system is always conserved. But during the short period of time during collision when there is no kinetic energy and only potential energy how is ...
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### Why doesn't Newton's third law mean a person bounces back to where they started when they hit the ground? [closed]

When we drop a ball, it bounces back to the spot where we dropped it, due to the reaction forces exerted on it by the ground. However, if a person falls down (say, if we push them), why don't they ...
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### Collision between 2D circle and flat surface [closed]

First of all I want to preface this post by saying that I am absolutely terrible at maths, my level of geometry equals being able to discern a circle from a rectangle but that's about it, as for ...
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### where is the best bounce on a racquet?

I am dropping a ball on a racquet, measuring bounce height against position. And the results are a bit all over the place. I found 3 places on the racquet that make the ball bounce higher. I read ...
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### Is the Momentum conserved? [duplicate]

I was trying to solve a simple problem regarding a particle being launched by an angle theta where it hits a rod, we have: a) System(Particle, Rod) b) System(Particle, Rod, Henge) My question is when ...
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### Are impacts in outer space more powerful than on Earth? [duplicate]

Is an impact less destructive on Earth than on other planets with no atmosphere, given that the momenta, factors like the line of impact are identical in both cases? If yes, then is it because there ...
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### Momentum is not conserved during inelastic collision?

When considering room as a system, when a ball is made to fall freely and it collides with the floor it loses speed each time it collides. The momentum hence is not conserved in this case? Can anyone ...
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### 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 ...
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### On defining mass scales using collisions

In A.P. French's Newtonian Mechanics (pages $319$, $320$), the author described a way to define a scale for masses. He said, One can set up an inertial mass scale for a number of objects $1, 2, 3,…$...
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### Collision of Rolling body

When a rolling body collides with a wall elastically,its torque is zero.But direction of velocity of particle is reversed.So will the angular momentum be conserved?
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### Conservation of energy in collision if A hits B but fails to move B

If body A hits body B but fails to move B what happens to its kinetic energy? There is no increase in potential energy. So what is accounting for this loss?
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### Is kinetic energy always conserved in an elastic collision/impact?

While working out through some problems I encountered this problem : A ball moving with a velocity $v$ hits a massive wall moving towards the ball with a velocity $u$. An elastic impact lasts for ...
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### Conservation of angular momentum in a collision using quantum mechanics

In an undergraduate course in particle physics we are learning about angular momentum conservation. In particular, at some point we analyzed the colision between a pion ($J=0, p=-1$) and a deuteron (\$...