Interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved.
0
votes
0answers
61 views
Collision of 2 neutrons
If two neutrons collide in 3D space and we want to determine the final velocities of both nuetrons (3 components for each neutrons), we can use the conservation of momentum equations and the ...
-1
votes
1answer
124 views
How can counting the number of cracks in glass tell you about the speed of impact? [closed]
How can the number of cracks in glass tell you about the speed of impact?
Can someone explain it to me? Here's the link...
2
votes
1answer
51 views
Heavy vs Light Particle Ideal Gases
Assume there are two ideal gases. The first is made of a light particle, and the second is made of a heavy particle. The two are of the same amount, in the same volume container, and at the same ...
0
votes
0answers
16 views
Question on domain wall speed in bubble collision
If our bubble universe will collide with another,for example one with a lower energy density what is the speed of the domain wall formed after the collision in our direction?
0
votes
0answers
20 views
What is the result of bubble universes collision?
Can anyone explain me what is the result of bubble universes collision according to eternal inflation in the case of two identical bubble universes with the same vacuum energy density (for example two ...
0
votes
1answer
40 views
Direct collision on smooth surface
Hello I have a problem on my hands an I cannot figure out the answer.
Two spheres of equal mass on on a smooth surface. sphere 1 is moving at $2v \ m/s$. Sphere 2 is stationary and 1m from a ...
0
votes
3answers
94 views
Collision of two balls [duplicate]
Two balls, with masses $m_1$ and $m_2$ are falling from the heigh $h$. All the collisions are perfectly elastic. Do not consider the size of the balls. $m_1 < m_2$ and lighter ball is on the top.
...
0
votes
1answer
56 views
Storing kinetic energy in bonds
Let's assume a setup with a static linear molecule with three identical atoms connected by bonds and a single atom, identical to the other three, being shot at the molecule. Let's also assume that ...
0
votes
2answers
91 views
Newton's Third Law and Constant Velocity
How can an object that's not accelerating cause another stationary object to move in a collision? This website: http://www.physicsclassroom.com/Class/momentum/U4l2a.cfm, says that a "rightward moving" ...
0
votes
1answer
61 views
Question about Cars: Momentum
Car B rests at the bottom of a frictionless inclined plane. In order to travel
a height of 0.6m and maintain a speed of 2 m/s at the end
of the track it needs to start with 4 m/s.
a) If ...
0
votes
3answers
82 views
Which parameter determines how much the 'recoil' or force applied by an object hurts?
Another question from my textbook, directly following after this question:
2 identical bullets are fired, on from a lighter rifle and one from a heavier one, with the same amount of force. Which ...
-3
votes
1answer
87 views
2 particles collision - deriving the equation for an energy which can become mass of new particles!
Q1:
Lets say a particle with mass $m_1$ and kinetic energy $W_k$ colides with a particle of mass $m_2$ at rest. Can anyone explain why do both particless ($m_1$ and $m_2$) plus an aditionall mass $m$ ...
1
vote
1answer
105 views
What would be the result of the collision of two down quarks?
Even if we can't have single quarks in nature because of the charge colour, what would be the result of the collision of two down quarks at high velocities (0,99% c) at high energies, like the ones of ...
0
votes
1answer
53 views
Calculate force of impact on running dog
I'm going to hold a dog protection tournament. I'd like to give the audience information about the force of the impact of the running dog when it hit(attacks) the decoy on a huge screen. I'm a ...
2
votes
2answers
66 views
How is the Principle of Conservation of Momentum proven using the Momentum-Impulse Principle?
Consider two particles moving in the same direction on the same line, $A$ and $B$, with mass $m_A$ and $m_B$, respectively. They also have velocies $u_A$ and $u_B$.
They collide. After the collision A ...
0
votes
0answers
84 views
Collision of 2 particles - calculating the mass and a speed after the collision
Lets say we have a particle of mass $m_1$ which has a kinetic energy $W_{k1}$. This particle collides with another same particle. How can i calculate mass $m_2$ and the speed $v_2$ of the particle ...
-1
votes
1answer
96 views
How - The force of a 60 mph crash is not just twice as great as a 30 mph crash; it’s four times as great! [duplicate]
The DMV manual says that
The faster you go, the less time you
have to avoid a hazard or collision.
The force of a 60 mph crash is not
just twice as great as a 30 mph crash;
it’s four ...
-1
votes
2answers
175 views
Two balls falling one above the other [closed]
Two balls, first with the mass $m_1$ and the second with the mass $m_2$ are falling from the heigh $h$. Suppose all the collisions are perfectly elastic and do not consider the size of the balls. $m_1 ...
10
votes
1answer
199 views
Mars just collided with Earth! A question of eccentricity
One of the standard theories behind the formation of our Moon is the giant impact hypothesis, according to which Earth was struck by a Mars-sized body (about $10\%$ the mass of Earth) early in its ...
25
votes
5answers
1k views
Is a proton collision (collisions like in the LHC) visible to the human eye?
I was curious if a proton collision is visible to the human eye.
(This might sound like a really basic question and forgive me if it is. I am very inexperienced in Physics and just wanted an answer ...
2
votes
1answer
72 views
Matter and anti-matter collision energy problem
From Beyond Einstein, by Michio Kaku and Jennifer Thompson, Chapter 13, Antimatter :
Dirac, also focused on the fact that Einstein's equation $E=mc^2$ wasn't totally true. (Einstein was aware that ...
-5
votes
3answers
112 views
Safest place to sit in the car [closed]
I have to sit in a car which has normal seats in the front, and lounge type chairs at the back, with seatbelts only in the front. The driver drives fast, and I think I may have an accident. So, ...
0
votes
1answer
91 views
Bouncing ball simulation computer science
In my Computer science class I was given a problem where I have to simulate a bouncing ball using "real physics". I have been trying to find a equation that will simulate the height of the bounce ...
0
votes
1answer
51 views
Something about collision [closed]
A sphere P of mass m, travelling with speed $u$, makes a head-on collision with a stationary sphere Q also of mass m. After the collision, the velocities of P and Q are $v_1$ and $v_2$ ...
3
votes
1answer
116 views
Can a linear momentum generate angular momentum at collision?
I'm trying to get the facts straight here.
Suppose I'm throwing a ball with no angular momentum. It collides with the ground and Newton's third law tells us that a force opposite to the gravity will ...
1
vote
2answers
151 views
Collision between a photon and an electron
Looking through this AP Physics question, I was struck by how the 'collision' between a photon and electron looks so much like a macroscopic collision. Is this even physically possible?
Look at the ...
0
votes
3answers
111 views
Two dimensional elastic collisions with varying angle of incident
If in an elastic collision I know all initial values and that mass for each object remains constant throughout the collision (but different from one another) how can I determine their final velocity ...
11
votes
2answers
368 views
What happens in electron-electron collisions?
What are the results of high energy electron electron collisions? Are other particles created?
6
votes
0answers
110 views
How multiple objects in contact are resolved in an inelastic collision, when edge normals don't “line up”
In a case I understand, let's say I have an object A moving at velocity V toward 3 objects in contact B, C, and D:
The momentum of A is the mass of A times its velocity. To figure out how the ...
0
votes
2answers
108 views
Simple conservation of momentum and frame of reference problem
I'm making a very simple physics engine based on momentum, and I'm solving what response to use for a collision from each involved object's frame of reference. However, something about how I'm ...
1
vote
0answers
68 views
Matrix element approximation
In the formula for the decay width of $\Upsilon(4S)$ to B-mesons from $\text{e}^+\text{e}^-$ collisions:
$$\Gamma_{\Upsilon(4S)\to B\bar{B}}=\frac{\left|\underline{P}_B \right|}{8\pi ...
3
votes
1answer
143 views
Angular momentum after elastic collision
If two balls collide (elastically) and there is no friction between them, will their angular momentum change after the collision?
2
votes
1answer
47 views
Finding the coffecient of restitution
A ball moving with velocity $1 \hat i \ ms^{-1}$ and collides with a friction less wall, afetr collision the velocity of ball becomes $1/2 \hat j \ ms^{-1}$. Find the coefficient of restitution ...
0
votes
2answers
382 views
Perpendicular Elastic Collision (different masses, different velocities)
I'm stuck on a mechanics problem and I can't make any headway past momentum and kinetic energy being conserved. Here is the problem:
Two hover cars are approaching an intersection from ...
3
votes
1answer
212 views
Firing machine question
Suppose we have a firing machine on a frictionless surface at point $x=0$. It fires a bullet of mass $m$ every $T$ seconds. Each bullet has the same constant velocity $v_0$. There's a body of mass ...
1
vote
0answers
16 views
How to write down the detailed balance (microreversed) amplitude
I know that time-reversal of a reaction and the detailed balance (microreversed, or reciprocal) reaction are different. Textbooks on scattering theory explain how to relate the S-matrix elements of a ...
0
votes
1answer
60 views
Do particles in the solar core travel at the same speed as they would in vacuum?
I just read the Wikipedia article on the Sun. The section on Solar Core states
It has a density of up to 150 g/cm3[47][48] (about 150 times the density of water)
Do the particles (atomic, and ...
2
votes
2answers
201 views
Elastic collision and spring
Bodies $A$ and $B$ are moving in the same direction in a straight line with a constant velocities on a frictionless surface. The mass and the velocity of $A$ are $2 \text{kg}$ and $10 \text{m/s}$. ...
0
votes
1answer
86 views
Newton's second law?
$F=ma$. A car strikes a wall at 60 mph. Its acceleration is zero at the time. The force of the car against the wall or vice versa is? To look at the car the force is not zero. Please explain.
3
votes
1answer
195 views
Elastic collision of rotating bodies
How would you explain in detail elastic collision of two rotating bodies to someone with basic understanding of classical mechanics?
I'm writing simple physics engine, but now only simulating ...
0
votes
2answers
66 views
Minimum $E$ of $p\bar{p}$-collision for $q\bar{q}$ pair with mass $m_q$
I am currently working out the energy required to create a particle anti-particle pair from a collision of a proton travelling along the x-direction with an anti-proton which is at rest. The particle ...
3
votes
1answer
118 views
Why do we hear a higher pitched sound out of water when we hit two stones against each other in the water?
The observer is outside the water; the stones are underwater (say, 1 m below surface, if that matters). This produces a higher pitched sound for the observer than when both the observer and the stones ...
4
votes
2answers
131 views
Best shape to reduce the splash of a droplet?
Our coffee machine catches the last couple of droplets, after your cup is removed on a shape to reduce plash of the coffee droplets.
These shapes are placed inside the spill reservoir.
The shape ...
0
votes
3answers
174 views
Couldn't we measure electrons with good enough technology? [duplicate]
I am a bit confused about the Heisenberg's Uncertainty Principle - just read about it in How to Teach Physics to Your Dog, by Chad Orzel. He states that the reason electrons can't be measured is ...
0
votes
2answers
2k views
Calculating force of impact
Since $\text{force = mass}\times\text{acceleration}$,
is it right to say that an object traveling at a high
constant velocity (zero acceleration), exerts zero
force upon impact with a stationary ...
0
votes
1answer
329 views
Calculating a 2D collision between two perfectly circular disks
Assume I have two disks, $p_1$ and $p_2$, of radius $r$, with their own velocities (preferably in $(x,y)$ form, but $(m, \theta)$ works too) and masses (unit-less, but same unit) collide in two ...
1
vote
1answer
64 views
Mean value of the force in a collision problem
I have the following problem:
A point with mass $m$ and speed $v$ collides with a fixed obstacle and penetrates it, stopping in a space $\Delta x$. Calculate $\Delta t $.
I understand the way my ...
2
votes
2answers
788 views
Small car colliding with large truck
A small car collides with a large truck. Why do both vehicles experience the same magnitude of force? Wouldn't the large vehicle experience less force than the small one?
1
vote
1answer
113 views
How to get the new direction of 2 disks colliding?
I'm developing a 2D game including collisions between many disks. I would like to know how I can get the angle corresponding to the new direction of each disk.
For every disk I have this information ...
15
votes
6answers
1k views
What would happen if Large Hadron Collider would collide electrons?
After some reading about the Large Hadron Collider and it's very
impressive instruments to detect and investigate the collision results,
there is a remaining question.
What would happen if the ...
