# Questions tagged [collision]

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

1,186 questions
Filter by
Sorted by
Tagged with
67 views

### How does conservation of momentum work here? [closed]

Imagine 2 oppositely charged particles attracted to each other, say an electron and a nucleus, assume their force of attraction is very large compared with any external applied force we're about to ...
270 views

### Relativistic collisions (elastic) - stationary target, equal mass [closed]

A moving electron with energy $E$ hits a stationary electron. Question is to find the scattering angle (the angle between the paths of the two electrons after collision) in terms of the energy $E$ and ...
21 views

### Mechanics of a stationary grain resting on the surface of a granular bed which is subject to a collision

Consider the following stationary configuration of three disks (in 2d): I would like to consider the two supporting (lower) disks as entirely static, but the upper disk can move, and it only rests in ...
66 views

### Elastic collision between a circle and a point [duplicate]

In a 2D environment, I have a circle with velocity v, a stationary point (infinite mass), and I am trying to calculate the velocity of the circle after a perfectly elastic collision with the point. ...
25 views

### Restriction for the rule: change in momentum=force x time?

I did a prac about impulse and momentum. F∆t=m∆v indicates that the change in momentum should same as the area under force time graph. I ran a experiment where a cart is released on a slope and hit ...
38 views

### Calculating velocities of 2 squares after collision

If I have 2 squares each with random velocities, and both with the same mass, would it be possible to calculate their velocities after a collision, and how would I do so?
65 views

### Which formula for elastic collision?

When researching a bit about elastic collisions, I've been confused about how many different ways there are to do this. I've seen multiple methods, some of which are extremely complex (using sine and ...
266 views

### What work is done by the wall when a ball hits it?

So, in my physics textbook it's written that the kinetic energy possessed by a body is equal to the amount of work done by an opposing force to stop the body, now that got me thinking that when a ball ...
105 views

### Which is more important for a force of the impact mass or velocity? [duplicate]

If a 2 times bigger mass collides with an object in which a 2 times smaller mass collides but with 2 times the speed which one will produce more force on the object? The object is stationary before ...
118 views

### Impulse imparted during elastic collision [closed]

Lets say there are two objects a of 1kg and a very heavy block. The light mass has a velocity of $12$ $ms^{-1}$ towards right. The heavy block has a velocity of $10$ $ms^{-1}$ towards right. The ...
54 views

### Inertia of a falling weight

I use a standard device (penetrometer) that uses a 10 kg weight that is dropped a constant distance to cause a probe to penetrate soil. The penetration distance after 4 blows is recorded. If I were to ...
1k views

### Why do objects rebound after hitting the ground? [duplicate]

When an object, say a shoe, falls from a height (under the influence of gravity), it rebounds after hitting the ground. For an object to move upwards, it requires a force to overcome its weight. When ...
86 views

### Mathematical expression of impulsive forces during a collision

I'm facing with problem regarding collision between bodies. Specifically, I need to understand the impulsive forces that arises during a collision. Sometime ago, I posted two questions (this and this) ...
49 views

### Falling from a high cliff [closed]

I've always wondered about the reason why falling from a high cliff could actually cause death, is it the normal force exerted back from the ground? or is it related to energy? or what? thnx.
82 views

### Predicting elastic collisions [closed]

I want to predict how a collision will go with physics. Say I have a perfectly elastic 1-dimensional system with a frictionless ground and two objects of masses say $m_1$ and $m_2$ moving with ...
55 views

### “Plushness” of a simple mechanical damper?

What heuristics generally define the "plushness" of a mechanical damping or braking system? For example, if a person or some mass is to collide with a fixed wall or the ground (e.g., after a vertical ...
94 views

### I have a pair of magnets that when I let go they attracted and broke

I let two magnets attract from a distance and when they hit they both broke a piece off of each-other. Why did the magnets damage each-other when they collided and is it possible to put the broken ...
83 views

### Merging black holes — how fast do they hit?

Orbital mechanics says something falling from infinity hits at the escape velocity of the object it strikes. The escape velocity at the event horizon is lightspeed, it must be higher for the ...
21 views

### How do big black hole kicks out small black hole?

I read that when 2 black holes collide they will either merge into a single black holes or recoil and the less massive black hole will be thrown out, I'm thinking of gravitational slingshot whereby ...
6k views

### Why don't merging black holes disprove the no-hair theorem?

The no-hair theorem of black holes says they're completely categorised by their charge and angular momentum and mass. But imagine two black holes colliding. At some point their event horizons would ...
84 views

### Kinetic theory of gas. Pressure in a container derivation feels wrong

NOTE: Please Imagine A cube with 2 parllel faces I and II lying along the x axis. In the derivation what we are thought Change in the momentum of the molecule = Final momentum - Initial momentum =...
418 views

### How do I find the direction of impulse vector in a collision?

I know that impulse is the change in linear momentum. Is the direction of impulse always along the change in momentum vector? Please explain.
3k views

### In particle colliders, according to QM, how are two particles able to “collide”?

According to QM, we know that The act of measurement forces a particle to acquire a definite (up to experimental errors) position, so in a particle collider, like the one in CERN, by which means ...
59 views

### Pion decaying energy

The question is: A pion decays into a muon and a neutrino (which is almost massless, so we’ll take it to have a mass of zero). If the pion is initially at rest, find the energy of the outgoing ...
68 views

### Is it correct to use Newton's third law on all these scenarios? [closed]

So I was thinking about Newton's third law for sometime lately, and my problem is more about the concept, I'm fine with solving problems. I thought of these scenarios and tried to apply Newton's three ...
65 views

### Two solutions of collision problem. Which is correct?

I'm solving a 1D problem, in which a particle with mass 2m collides elastically with a particle of mass m. Both of them have a speed V. After setting up the equations I've reached a quadratic ...
26 views

### $F_n$ force between 2 objects in space

I am trying to do a research project for school where I'm trying to simulate the physical world in a computer environment. So far things have been working great but I have trouble understanding how ...
55 views

### Centre of mass collision

A proton with momentum 3 GeV in LAB frame of reference is difussed elastically by a stationary proton. The angle of diffusion of one of the protons, in the CM system is 10º, corresponding to a moment ...
222 views

### 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 kinetic energy after collision. m2 >>> m1 v2 = -v1 Will ...
100 views