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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How to solve this one-sided constraint problem?

As shown in the figure below, ball 1 and ball 2 are connected by a rigid rod without mass. The wall and floor are absolutely smooth, and the mass of ball 1 and ball 2 are all $m$. The other geometric ...
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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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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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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 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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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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Combining two coefficients of restitution

The coefficient of restitution tells you how the velocity of an object changes after a collision due to losses. If $v$ and $v'$ are the relative velocities before and after the collision then $$e=\...
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If a ball is thrown to a person standing on a frictionless surface, is the impulse of the thrower equal to that of the catcher?

If a person throws a ball, exerting a given impulse does the person that catches the ball receive the same impulse assuming that the catcher moves. Is the impulse that the catcher receives less than ...
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The Physics behind “The Wall” Game show ball drop

In "The Wall" game show, the slots and also the diverters are designed symmetrically and also identically. So when a ball is dropped from a particular slot number it should end up in a particular ...
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What would happen if a black hole swallowed a white hole? [duplicate]

I’m just curious on this, if you can tell me then please do. Also don’t shame me for my bad question I’m just a curious little fella!
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Macroscopic object grazing the event horizon of a supermassive black hole

Just a noob question: They say, when you dive into a heavy/large enough (supermassive) blackhole, there should be nothing wrong with you at the time of touching an event horizon. I suppose it's a ...
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Does a higher velocity make a collision more or less elastic? Does it have any impact on it at all?

Basically, if you increase the velocity before the collision, does the collision become more elastic? If you used conservation of energy as proof, (i.e the faster the velocity, and the less percent of ...
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When does a collision become classical?

I was thinking (after misinterpreting and answering another question) about collisions on the atomic scale. I know it's impossible to visualize, but I did. For example the collision between an ...
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Newton's third law of motion confusion [closed]

Suppose, there are two objects, namely, A and B. Suppose, object B is more fragile than A, such that it breaks on the application of a 5N force. If A is accelerated such that the force carried by A is ...
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Collision and conservation of momentum

I was considering a situation where a bullet was shot at an angle and lodges itself into a block and then the to move as a system. As usual, I figured I could solve for the final velocity of the ...
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Calculating the total time elapsed until two pendulums “stop colliding” gives a divergent result [closed]

Setup Consider the following situation: Two (small) balls hang by two identical ideal threads, such that in their initial states the threads are perfectly vertical. The two balls are moved by small, ...
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163 views

Elastic collision question [closed]

I have a simple elastic collision question. In a perfectly elastic collision between equal masses, can the mass with a slower speed transfer energy to the mass with a faster speed? No constraints ...
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Newtonian-Mechanics .Elastic reflection [closed]

Question from the olympiad. Two planes move perpendicular to each other with speeds $v = 1m/s$. A body flies at them with a velocity of $u = 1 m/s$ at an angle $a=45$ to the surfaces of the planes ...
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Conservation of Mechanical Energy in Collisions

The Law of conservation of Mechanical Energy states that in a closed system with no non-conservative forces acting, the energy of the system will always remain constant. This makes sense for an ...
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Derivation of collision term in Boltzmann equation: Trying again [duplicate]

Can anyone show me a derivation of the collision term in the Boltzmann equation? I don't mean one of the simplified varieties. I mean Boltzmann's full-blown term as here. Update: I asked this ...
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Would a group of molecules in a container, settle down after a long time? (considering that no gravity acts on them) [duplicate]

Because, every time they collide, don't they emit radiation? As in, losing energy in the form of this radiation, So eventually, won't they lose all of their kinetic energy? Of course the time taken ...
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What is more harmful in a car crash - restrciting movement or allowing some movement to reduce g-force?

Sorry if I haven't worded the title very well, feel free to improve. Let me explain before I ask my question... We have purchased a car carrier (small version) for our dog and also purchased some ...
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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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Why do objects always stick together in perfectly inelastic collisions?

From what I understand, perfectly inelastic collisions are those in which the maximum possible amount of kinetic energy is lost from the system. This means that the kinetic energy after the collision ...
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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 ($...
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Why won't a full laundry basket bounce?

I've noticed a curious behavior of my plastic hamper and laundry baskets. When they are empty tossing them more then a few feet from hip height (3 feet) causes them to bounce and tumble. Yet when they ...
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37 views

Questions related to collision

I have a few questions related to collision: Is coefficient of restitution($e$) only defined for velocities along common normal in an oblique collision? Can conservation of momentum only be applied ...
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Slingshot around a black hole, dipping into event horizon

Suppose we have an object swinging by a black hole. My understanding is that if it remains outside the black hole, it just swings by and doesn't lose any energy (except maybe gravitational waves?). ...
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Free fall with added deceleration [duplicate]

My question is about free fall from an airplane. Lets say your seat detaches from the plane and you follow a standard free fall. $$v^2=v_0^2+2g\Delta x=\sqrt{0+2\cdot 9.8\,\mathrm{m/s^2}\cdot 10000\,\...
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What happens to the momentum when 2 black holes collide and no matter is present?

Imagine 2 non-spinning black holes with identical mass collides with each other at the same speed in the absence of other matter, I think the gravitational waves can only carry a little of the ...
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Is it possible to conserve the total kinetic energy of a system, but not its momentum?

It is possible to conserve momentum without conserving kinetic energy, as in inelastic collisions. Is it possible to conserve the total kinetic energy of a system, but not its momentum? How? To ...
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Determining the velocity for a radial impact on an orbiting satellite

Say a planet P and a satellite S (the size of a moon) system exists and the orbit of S around P is circular. To make the satellite S crash into P, I can either slam an S sized comet C opposite to ...
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Relativistic+quantum mechanics of particle collisions

When we look at at a relativistic collision like compton scattering or decay of the Higgs particle, we treat the colliding particles literally as particles following a definite trajectory and ...
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Is my impact on the ground greater than my weight when I jump from the ground? [closed]

Is my impact on the ground greater than my weight when I jump from the ground? Is my impact on the ground greater than my weight when I fall to the ground? I think it's all over my weight. But I'm not ...
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Is there any different how we smash antimatter and matter together?

Imagine: Setup A, we smash relativistic electron at a stationery positron. Setup B, we smash electron and positron head on both moving at fraction of speed of light. Setup C, we allow electron to ...
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Acting forces on a curve ball (billiards)

I am trying to understand how the physics behind a curve ball in billiards work. Please see the attached picture: The red ball is meant to hit the blue ball. But to reach the blue ball, it has to go ...
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Question About Collisions Between Neutrons

I came across this question from AP Classroom that asked something along the lines of, Neutron A was traveling at velocity: $v$ and has wavelength $\lambda$. It then hit neutron B and after the ...
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How can I find the Final velocity of the System (if perfectly inelastic) Ignoring air resistance [closed]

I am given that a bullet of mass 24.6 grams is shot at a block of 231 grams that will slide on a wooden desk with a coefficient of kinetic friction being .210. all i'm given is that the block more 32....
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When a ball hits the wall, the higher the speed of the ball is, the stronger the ball exerts a force on the wall

I am reading an elementary mechanics book and I have the following question now. When a ball hits the wall, the higher the speed of the ball is, the stronger the ball exerts a force on the wall. ...
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Is the speed of recession equal to the speed of approach for any elastic collision?

I am comfortable with the idea that in a one-dimensional elastic collision, the speed of approach of the two colliding bodies is equal to the speed of recession following the collision, which can be ...
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What happens when a weapon breaks on impact?

Here is the situation: You are attacking someone with a wooden pole (such as a pole arm or tree branch). You either (1) hit as hard as you can and the pole breaks into two pieces on impact OR (2) hit ...
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An asteroid strikes Earth. I’m skydiving. Do I die? [closed]

Let’s say I’m skydiving at a high altitude and, while falling, an asteroid strikes Earth. Is there a certain mass / momentum of the asteroid below which I would have a chance of surviving? Or would ...
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Which collision equation is appropriate to use?

Take this example problem: A 2 kg ball moving east at 3 m/s that enters in collision with another 1 kg ball moving west at 2 m/s. After the collision, the 2 kg ball has an eastward speed of 10 m/s. ...
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Collisions and the kinetic theory of gases as discussed in Feynman's lectures

In The Feynman Lectures on Physics Volume $1$, Chapter $39$: The Kinetic Theory of Gases, section Temperature and kinetic energy (which can be found in this page), the author discusses the subject of ...
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Time taken by a cubic metal to stop after hitting a wall is independent of the velocity with which it hits the wall!

While doodling with stress and strain I came to a conclusion that the time,$t$,take by an object ( here a metallic cube) under elastic collision to stop when hitting a wall (with Young's modulus, $Y_{...

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