# 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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### Solving Particle in a Box using Newtonian Mechanics

so I'm trying to solve the one dimensional particle in a box problem known from quantum physics in a classical context. So according to Wikipedia (see picture on the right) we would get a particle ...
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### 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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### Mass, speed and collide elastically [closed]

Two titanium spheres approach each other head-on with the same speed and collide elastically. After the collision, one of the spheres, whose mass is 300 g, remains at rest. (a) What is the mass of ...
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A ball of mass $m$ and speed $v$ strikes a wall perpendicularly and rebounds with undiminished speed. If the time of collision is $\Delta{t}$, what is the average force exerted by the ball on the wall?...
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### Collision of objects in orbit around Earth [closed]

I'm doing a risk assessment of space debris in low Earth Orbit (about $1000-2000$ kms). While working on a simplified model, I couldn't correctly predict the outcome of a random collision, so far we'...
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### If two atoms collide then will one of their electrons be excited, always?

Over here, https://cdn.discordapp.com/attachments/702561907961233459/714002823876182096/IMG_20200524_120155.jpg In the solution to this question, it says that maximum kinetic energy change occurs ...
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### Collision between 2 springs [closed]

Four material points, all of mass m, are aligned along a straight line and connected two by two by two equal springs, of elastic constant k and rest length $l_\epsilon$. The points are subject only to ...
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### Why does the De Broglie Wavelength influence the scale in which a nuclear reaction occurs?

In high energy accelerator collisions, why does the De Broglie wavelength of the incident particle affect the type of interaction it has with the target nucleus? E.g. In 280 MeV proton, "direct ...
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### “A perfectly inelastic collision has a coefficient of 0, but a 0 value does not have to be perfectly inelastic” what does this mean?

I was reading the article on Co-efficient of restitution on Wikipedia. I came across this line: A perfectly inelastic collision has a coefficient of $0$, but a $0$ value does not have to be ...
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### Is plasma at equilibrium considered to be collisionless?

I would like to know if Is plasma at equilibrium is considered to be collisionless?
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### What's so perfect about perfectly inelastic collisions?

Perfectly Inelastic collision is the case when two bodies that collide, move with the same velocity after the collision. An Elastic collision is a collision in which both Kinetic Energy and ...
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### Elastic Collisions and Violation Thereof in the Case of Shattering

In Taylor's Classical Mechanics, he includes the following discussion as a follow up to a discussion of energies of interaction and how elastic collisions arise in cases where the force of interaction ...
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### Co-efficient of restitution

Co-efficient of restitution is defined as $\displaystyle\frac {Relative \ velocity \ after\ collision}{Relative \ velocity\ before\ collision}$ so lets consider two bodies A and B moving with ...
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### Why doesn't the speed of objects change in the reference frame of center of mass?

We often say that before and after 1-d elastic collision, one objects velocity only changes its direction in the reference frame of their centre of mass. I can show this algebraically, writing ...
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### Question About Momentum and Impulse of a Dropped Egg

If an egg is dropped with a cushion, I know that the cushion will reduce its impulse. Since impulse = change in momentum ($J = \Delta p$), would the change in momentum also be affected by the ...
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### If a vehicle with constant velocity hits me then is it correct to say that the vehicle exerted no force upon me and therefore I am unhurt?

Consider the scenario where a vehicle moving at a constant velocity collides with me and maintains it's constant velocity during the collision. What I think is that I may get hurt, which is just ...
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### Collision Thought Experiment

I am thinking of a system of isolated, moving, and colliding particles in a frictionless box. The collisions were inelastic. My question is: Supposing that the initial total momentum of the system is ...
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### Will a dropped ball compress faster than it decompresses?

I'm modelling how a ball's compression changes over the duration of an impact. However, I'm not sure if on the physics behind the compression/decompression rate... Or would decompress at the same ...
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### Is the Principle of Conservation of Momentum applied incorrectly in M1?

I' was doing this specimen paper in Pearson Advance Subsidiary level Mechanics 1( M1). However, I do not agree with the fact that the mark scheme wants you to use the Principle Conservation of ...
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### Why do protons need to moving at high speed to collide?

I want to know Why protons need to moving at high speed to collide? I know that both protons are positively charged so the electrostatic repulsive force would tend to make them miss each other at ...