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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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Two bodies, one with mass m and the other with very very huge mass (tending to infinity), moving with velocity v and -v (opposite directions) collide

Assumption: The bodies are moving on the same axis, along their center of mass, and the bodies are perfectly spherical. There is no loss of energy after collision. m2 >>> m1 v2 = -v1 Will the bodies ...
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3D perfectly elastic collision between two points

There is a high probability, I think, that this question is a duplicate of some other question ... but to may knowledge, it hasn't been posed in this exact manner: Assume we have 2 points, $P_1$ and $...
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Particle collision and mass relation

Is mass important in calculations when two particles are collide? or is only the charge that matters? is collision in microscopic world the same with macroscopic world?
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Ball collison in 2D in Java [on hold]

For a course in my university the final project is basically making a program with java that simulates some particles moving in a 2D frame.We should consider that the collision may not be completely ...
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2answers
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Collision between two objects where the center of mass never moves

I had the following problem: Image two cars approaching one another in opposite directions. The first car is twice as massive as the second car. They move so that the center of mass of the two-...
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1answer
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Momentum of projectile in the centre of mass frame in a two body system

The COM frame is defined as the coordinate system in which the centre of mass of the system is at rest. In the case of a 2-body system the center of mass coordinate is: $$\vec{R_{CM}} = \frac{M_A \...
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Why are there no excitations by collision for the visible transitions in the Franck-Hertz experiment?

The minima of the I(V) graph for a Neon Franck-Hertz tube are approximately 20V apart from each other, this is usually explained by the fact that excitation by inelastic collision happens at about 20 ...
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Number of collisions with block [closed]

The problem is given in David Morin's Classical mechanics. Here is the screenshot: Now, I jumped to solve part b of question. To find the number of bounces,we note that mass losses momentum of -2mV ...
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Solving elastic 2-dimensional collision problems where the resultant angle is not provided [closed]

Having real trouble with the question below that is part of my engineering course. I've sussed question 6 but making no headway with Q7. A ball of mass 0.2 kg collides elastically with a heavier ball ...
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1answer
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Total energy, total momentum of two different balls [closed]

I have a ball out of plasticine thrown horizontally with speed $v$ on a steel ball that is attached from top to the ground on flexible straps in the middle (see picture). The mass of plasticine is $m$,...
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3answers
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Problem to solve momentum (Classic Newton mechanics) [closed]

First of all, I want to apologize for my English I'll try to explain my self clearly. I want to share one question about Newtonian mechanics from my homework, of which I can't understand the logic ...
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Can someone help demonstrate what is easily demonstrable? [closed]

I am currently starting an intro class to special relativity and quantum mechanics. My first homework involves solving a 1-D collision with a Galilean transformation. I first was going to solve the ...
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What makes a collision 2D?

In my mechanics course, we've covered 1D and 2D collisions. However, what physical factors determine whether a collision will be 1 or 2 dimensional? To make the question more precise, consider a ...
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How would a fast-moving atom interact with a body? [closed]

I found this question on Quora: https://www.quora.com/Can-you-theoretically-shoot-an-atom-fast-enough-to-kill-its-target I think the Quora answer is good but incomplete, and it got me wondering what ...
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2answers
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In a masses inelastic collision, K energy convert to heat but velocity remain same. we receive heat without losing velocity? how?

I have read the answer about the energy and momentum conservation question but I have a great question now! Imagine we have two masses which one of them is at rest and another move and collide to the ...
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Why does shooting a handgun accelerate a bullet to deadly speed without injuring the gun user's hand?

Momentum is defined by the product of mass and velocity. Now a projectile out of a gun has to have high velocity to penetrate a human body, as its mass isn't significant. But to reach this velocity, ...
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3answers
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Surviving a fall into a balloon-filled pit [closed]

My brothers and i have been debating this question for years. If an average person fell at terminal velocity into the center of a pit that is 1 mile deep x 1 mile in diameter, and the pit is filled ...
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Why do the colloidial particles in a viscuous fluid stop (stroboscopically) moving below a treshold as described in the experiment below?

In a nice experiment (inspired by the renowned physicist G.I. Taylor), which can be seen in this video (around 12 minutes), Professor David Pine and Professor Jerry Gollub filled a Couette cell with a ...
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1answer
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Inelastic momentum question: How to calculate velocity before the collision? [closed]

EDIT: NEVERMIND! MY APOLOGIES, I DID NOT READ THE QUESTION PROPERLY. I DID NOT SEE THAT IT SAID THAT THE GUY WAS STATIONARY. I was doing a practice physics question and stumbled upon a question ...
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3answers
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Direction of force when ball strikes an edge

From the perspective of classical mechanics, when a ball strikes an edge of a box-like-object, as shown here what is the direction of the force from the ball on the object (assuming there is no ...
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1answer
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Impact Flash? In Vacuum?

I was wondering, when you have a "hypervelocity impact" e.g. a meteor or Space Debris hitting a body in orbit, why do you get a "flash" of light and how large would the flash be for a given impactor ...
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Does the total kinetic energy change during an elastic collision?

If two balls of same mass with speed $v$ and $-v$ undergo an elastic collision, the kinetic energy will be the same after the collision as before. However, during the collision, does it also remain ...
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1answer
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Conservation of kinetic energy in two dimensional elastic collisions

I have a question where two particles collide with each other in a non central way. Mass of particle 1 ($m_1$) is $1\text{kg}$ and its velocity $v_1$ is $5\text{m/s}$ (moving along the x-axis) ...
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Newton's cradle: why not twice the balls at half the speed? [duplicate]

For "Sinterklaas" (Dutch holiday) I got a Newton's cradle. I understand the basics of it, but a couple things bother me. If I drop one ball, one bounces off. If I drop two, two bounce off. Why, if I ...
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0answers
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Collision response with spring physics in RK4

I'm trying to figure out what's in the title. I've gotten regular spring physics working and now I'm trying to do something similar with actual collisions (player character colliding with the ground ...
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What attributes determine the sound made by colliding objects? [duplicate]

Simple question, probably very complicated but fascinating answer: If you whack something with a stick, the collision will produce a sound. The quality of the sound however will vary greatly with... ...
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1answer
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How to calculate time at which two circles will touch?

Hopefully this is the right... Stack to ask this at. Apparently there are a bunch of them. I'm trying to find a formula to detect the time at which two circles in a 2d plane will touch. I'm given the ...
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1answer
36 views

Will space junk handle itself to an extent?

So suppose that two satellites traveling in opposite directions collide and some bolts are hurdled at higher speeds than either of the bodies were traveling before. Since the junk is traveling at a ...
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2answers
56 views

What happens to a softer material hitting a harder material at high speeds?

You often see action scenes in media, where a person is thrown so hard against a concrete wall, it breaks. My question is if it's possible for a softer material to be accelerated to point where it ...
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1answer
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Calculating temperature of objects after colliding

So, I'm making a physics engine, and I need to know what is the temperature object A has after colliding with object B. Object A is 10 earths in diameter, and is 10 earths in mass. Object B is 5 ...
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5answers
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Can momentum not be conserved in an inelastic collision?

Consider an inelastic collision in which a ball B of light mass moves towards a ball of clay A and ultimately sticks to it. Suppose that the whole system (A+B) comes to rest. Every book on Newtonian ...
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If the molecular collisions are elastic will there be any dissipation in a fluid?

Viscosity arises due to collisions of the molecules of one layer of a fluid with another in contact. But viscosity is a dissipative element leading to heating and dissipation. Where does it heat come ...
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2answers
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How does the velocity of the fluid layers gradually increase towards the axis of a tube?

For a fluid moving through a cylindrical tube in a streamlined motion, a fluid layer in immediate contact with the wall of the tube remains effectively at rest. The layers away from the wall has ...
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1answer
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Using coil gun make two mass of lithium deuteride collide and start nuclear fusion

We already have hydrogen bomb, why controllable nuclear fusion so difficult? And why controllable necessary? If we can detonate a tiny hydrogen bomb, we can collect the energy, like laser nuclear ...
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Position based dynamics: explosive collision constraint velocities when timestep is small

I'm studying PBD algorithms and can't figure out the solution to a particular problem. Here is the pseudocode for a typical PBD solver loop: For normal equality constraints (distance constraints ...
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1answer
51 views

Types of Collisions and velocity

I know that there are three different collisions elastic, inelastic and perfectly inelastic. I wanted to know how the three velocities would rank respective to the type of collision. For example, if a ...
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1answer
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If a object that's bigger than the other collides with one thats more massive, who wins?

So, let's say you've got two objects (A and B), A has a mass of 20 suns, while B has a mass of 10 suns, but A is only 10 suns in radius, while B is 30 suns in radius. If both objects collided, who ...
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Why is there discrepancy in conservation of energy and momentum in my modified version of Veritasium's bullet board experiment?

https://youtu.be/BLYoyLcdGPc This is the Veritasium's bullet board experiment: A bullet is shot from beneath a horizontal board. The first time it is shot right underneath its centre of mass, and the ...
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4answers
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I recently solved a problem where a tenis ball is kept on a basketball and basket ball is at some height from the ground [closed]

. When the system is released the tennis bounces back to a larger height than it was before. what is the reason for this? I mean the problem assumes elastic collisions. How can the tennis ball rise ...
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Event Horizons and Events [duplicate]

How can two black holes with event horizons merge within the lifetime of the universe? Basically events are happening where events stop (to the outside observer) so does an event horizon actually ...
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Convergence of Milky Way and Andromeda

It is definitely a certainty that Andromeda will collide directly with the Milky Way in ~4 billion years. Has it been estimated how long the two galaxies have been attracted to each other to the ...
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Angle between velocities: Elastic collision question in 3D

I have been given a scenario of a proton (particle 1) travelling with u1 = 3î+ 4j–6k and a Helium-3 nucleus (particle 2) travelling with u2= 3î+ 4j–2k. The two particles collide and the proton (...
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1answer
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Find impulse provided by the stopping object [closed]

I have tried to understand this problem, but I'm still struggling with it. a 27g bullet hits a piece of wood and goes in 8.6 cm. if the bullet stopped in 0.44ms. what impulse did the wood provide?
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2answers
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Why can't we expand the definition of the system until momentum is conserved?

So, here a ball initially moving with a velocity v and collides inelastically with a pivoted rod. I've learned that this is a classic example for the conservation of angular momentum. My question is ...
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5answers
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Why does my bumper scrape when driving fast over a bump but not slow?

When driving my car over a bump or a quick change in gradient (from flat to uphill or downhill to flat), if I don't drive slowly and the bump/change in gradient is large enough, I'll end up with my ...
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2answers
539 views

Car and truck collision

When a car and a truck crash, the car seems to get damaged a lot more. Why does the car get more damaged then the truck in the collision?
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1answer
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How would you calculate the force of a hammer hitting an anvil? [duplicate]

If I were to hit an anvil with a hammer (let's say a 1 kg hammer at 1 m/s) how would the force of the impact be calculated? So, where I'm at with this is that I know the deal with f = mv, so the ...
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Kinetic energy transferred to a particle in a single collision: Cosmic Rays colliding with DM

I am reading a paper regarding energetic cosmic rays (CR) colliding with cold dark matter (DM) and thereby creating a component of DM with semi-relativstic momenta. (https://arxiv.org/abs/1810.10543) ...
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5answers
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Why isn't energy conserved in this collision problem? [closed]

I am stuck in a question where energy conservation is failing and momentum conservation is correct. I think I might be doing something wrong, that's why I'm asking this question. The problem is as ...
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1answer
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If two identical objects (A and B) are dropped from the same height, and B has protective packaging, why is B less likely to be damaged?

I know this question has to do with impulse and collision, and if it were in numbers, I could give an answer to it, but how can I explain this in words? Both object A and B are identical, however, ...