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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Confusion about momentum

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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How does a water jet hitting a wall move parallel to the wall if momentum is conserved?

Classical mechanics says that if I throw a ball with velocity perpendicular to the wall and it collides elastically with the wall with a velocity $v_0$, then it bounces back with the same velocity $...
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Evaluating bounce direction after pool ball hit cushion with sidespin [closed]

A pool ball moves to hit the cushion with speed $Vi$. It has some sidespin on it, so it bounces back with speed $Vf$. I want to know a realistic way to evaluate the side spin effect over $Vf$. I'm ...
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Heavy charged particle collisions with electrons of relatively large energy

I am told that, when a heavy charged particle passes through a substance, some (small number of the) collisions occur with electrons of relatively large energy. I am then told that the maximum energy ...
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Questions about a heavy charged particle passing through a substance

I am told that, when a heavy charged particle passes through a substance, ionization occurs. I am then told that the most probable occurrence is collision with an atomic electron. Finally, I am told ...
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How realistic is this billiard game shot?

I used to think Miniclip's 8 ball pool is physically accurate. At least everything in the game feels so. However, I recently was able to see my shots in this game in slow motion, and was experimenting ...
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Equations for Perfect Collisions

I have two bodies of known mass $m_0$ and $m_1$. $m_0$ is at constant velocity of $v_0$ on a level friction-less plane surface, and $m_1$ is moving across the same plane at constant velocity $v_1$ ...
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Is the impulse 0 in a perfectly inelastic collision?

I have this problem: An object $A$ of mass $48\: \text{kg}$ hits with a velocity of $7.0 \:\text{ms}^{-1}$ another object $B$ which is not moving. After the collision the two objects move together ...
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Is the law of conservation of momentum valid during long collision times

Suppose that two particles (1) and (2) collide, and (1) experiences a force $\mathbf S_{12}$ from particle (2) and the sum of all the other possible forces as $\mathbf F_1$. Then, the impulse on (1) ...
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$W^+/W^-$ bosons ratio in proton-proton collision

I'm studying my first-year physics in college, and I'm having to write a report of some proton-proton collisions that were registered in the LHC of CERN years ago. The main goal is to identify ...
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Triginometric formula for calculating results of 2D elastic collision [closed]

I am trying to write a code that manages elastic collisions between two circles in 2D space but am failing to locate a working formula. For the collision itself the known variables are: mass of ...
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“Collision” of two charged particles [closed]

Two identical charged particles each carrying charge $q=0.1\,\mathrm{mC}$ and of mass $m=10\,\mathrm{mg}$ are projected along two parallel lines separated by a distance $l$, with equal speed $V_0=104\,...
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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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113 views

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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Conservation of $p_a^\mu p_b^\nu \eta_{\mu \nu}$ for relativistic collisions

Two photons with 4-momenta $p_1^\mu$ and $p_2^\mu$ collide to produce 2 new photons with momenta $p_3^\mu$ and $p_4^\mu$. I need to show that $p_a^\mu p_b^\nu \eta_{\mu \nu} = p_c^\mu p_d^\nu \eta_{\...
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Confusion regarding a case of head-on elastic collision of two bodies of equal mass

If two bodies collide elastically, it's common to hear that the velocities, speeds and momenta are interchanged. I thought this was obvious. But if we consider two bodies moving with equal mass and ...
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Which of the two formulae should I take as the initial kinetic energy of the system to find the stopping distance in a perfectly inelastic collision? [closed]

A simple exercise in classical mechanic: A ball of mass $m$ and initial speed $v$ collides with a block of mass $M$ at rest. The coefficient of kinetic friction between the block and the ground is $...
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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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Modelling impact between two objects with mass spring damper

I am trying to model the 1D impact between a member and a ball using a mass-spring-damper system as the following: Using that model, I have come up with the following differential equations: $$m_{1}\...
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Momentum conservation in relativistic collision of identical particles

In the Feynman Lectures on Physics (Lecture 16, Vol I) there is this example where he considers an elastic collision between two particles with the same initial speed (say $v_0$) Considering the ...
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Momentum conservation in ball and massive wall collision [duplicate]

I know momentums definition (p=mv) and how to calculate problems involving it, but there are bits I don't understand. Take a ball thrown at a wall for instance with mass value (5) and velocity (5). ...
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How to prove if two objects collide using relativistic equations? [closed]

Suppose you see two objects moving in space towards each other, you also see them colliding now can you prove that mathmatically using Lorentz transformations or anything else. But only under ...
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The exact definition of the Lab frame

What is the exact definition of the lab frame? In most textbooks, the ‘lab frame’ is taken to be that in which one of the particles is initially at rest. Can we define a 'lab frame' for example, in ...
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Relative velocity during a collision

I quote Resonance Kota module on Mechanics(Vol.1): The collision is just avoided if relative velocity becomes zero just at the moment the two cars meet each other. I don't understand why should it ...
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ENERGY TRANSFER

Why does an electron carry half the center of mass energy after undergoing RELATIVISTIC elastic scattering at 90 degress with a proton in the center of mass frame. Is there a reference that you may ...
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Could collision of two black holes, each the mass of the moon, be a good probe for quantum gravity?

This is a naive question (to say the least), so I’m expecting another tsunami of downvotes :) I’ve been learning about the “ultraviolet catastrophe”, and Planck’s solution to it, which theorizes that ...
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Unable to use energy conservation though it's perfectly valid [closed]

A massless rod of length $L$ connects 2 balls A and B of mass $m$ each. It is hinged at centre and free to rotate in vertical plane. A third ball C of same mass falls on B from height $h$ and sticks ...
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Is inelastic collision formula wrong?

At school, I was taught that when two object collide and merge into one, and due to the conservation of momentum we will have this equation: m1.v1 + m2.v2 = (m1 + m2).v3 with: m1, m2 are the two ...
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Why a ball doesn't stop when it collides with a wall?

If a ball collides with a ball of same mass the first ball stops and the second ball gets the velocity of first ball.The first ball stops due to the reaction force acting on it. But when a ball ...
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Prime numbers in physics of falling and collision [closed]

A small ball moves at a constant velocity v along a horizontal surface and at point $A$ falls into a vertical well of depth $H$ and radius $r$. the velocity of the ball forms an angle $\theta$ with ...
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General question about Galton Board

I’m new here, and most notably NOT a Scientist, but I do have a question about the Galton Board (which I happily stumbled upon today, thanks to YouTube and ‘the quarantine’) So, as I understand it, ...
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How do we know that one particular solution for the velocities of a two-body elastic collision is the correct one over the other?

Assuming there is a 1-D collision between two bodies, having masses $m_1$ and $m_2$, if we conserve energy and momentum, we get two solutions. $$ v_{1,i} = v_{1,f} \\ v_{2,i} = v_{2,f} $$ or $$ v_{...
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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 ...
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Why the total momentum and kinetic energy of a subatomic particle in a head-on collision is transferred to another particle?

"When two atomic particles collide (eg- 2 protons) on a single line: At first, one proton is stationary and the other moving. When they collide, the total momentum and kinetic energy of the proton ...
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Why are atomic electrostatic collisions perfectly elastic?

"In atomic or nuclear scattering, the collisions are typically elastic because the repulsive Coulomb force keeps the particles out of contact with each other" How does this allow the interaction to ...

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