Collisions Definition and 724 Threads

I am currently studying collisions in high school and my teacher told us that, in order to calculate the direction of each object after a 2-body collision, we could change the values in the relative velocity terms of the equation of the coefficient of restitution to the components in x and y. Is...

Hi, in terms of oblique collisions, COM frames and laboratory frames, is this statements ALWAYS true? "The scattering angle of the first particle in the laboratory frame is half of the scattering angle in the center of mass frame." Please elaborate if you know, thanks in advance!

I would like to check my understanding for this problem : A puck with mass ##3m## is stationary on a horizontal friction-less surface. It is being impacted in an elastic head-on collision by another puck with the mass ##2m## traveling with speed ##u## to the right. Find the speed and direction...

The generation ship in my fictional story was built by aliens that know how to use these 3 things: Artificial gravity to make it feel like Earth throughout the ship. Controlled nuclear fusion with 6 tanks. Only 1 needs to be fueled and you have fuel that will last for at least thousands if not...

Homework Statement Is following statement True or False? For inelastic collusions, the total KE of colliding objects just after collision is less than the total KE just before collision. The answer is given as False with a mention saying: "This is normally true but in some cases it could...

Homework Statement Let two particles of equal mass m collide. Particle 1 has initial velocity v, directed to the right, and particle 2 is initially stationary. A: If the collision is elastic, what are the final velocities v_1 and v_2 of particles 1 and 2? B: Now assume that the mass of...

Homework Statement Canal rays, i.e., positive ion rays are generated in a gas discharge tube. How often does an ion (r= 0.05 nm) collide with an atom of the ideal filler gas(r= 0.1 nm) if it travels 1 m in a straight path through the discharge tube and if the pressure in the tube is 1 mbar? 1...

Hi guys. Feels dumb coming back to this but I seem to have confused myself I was helping a friend with the problem: You shoot protons going v=4.2e7 m/s through a particle accelerator. They collide with gas particles of an unknown mass (pretend no velocity) and all bounce back elastically at...

Good afternoon! I would like to preface by saying, yes, this is for a project. I am only posting here to see if my method of solving is correct before I finish the project incorrectly. Homework Statement I chose two balls, mass A: .553 kg and mass B: .410 kg I recorded their collision and...

In kinetic theory, the number of molecules hitting a unit area of a surface per unit time with speeds between v and v + dv and angles between \theta and \theta + d \theta is found to be a function of sin(theta) and cos(theta). There will often be a practice problem asking to show that the...

In an oblique collision my understanding is that linear momentum is conserved in all directions (x, y, normal, tangential). But in a constrained oblique collision, does this change? For example if we had a block lying between two frictionless surfaces with an angled face ( a slope on one face)...

Let's say that 2 objects inelastically collided in outer space. One has a Mass of 2kg, and velocity 5m/s. The other has a Mass of 4kg, and velocity is 0m/s. ( at rest) 1) Energy cannot be created or destroyed. (Energy is conserved) 2) Momentum is conserved. Total Momentum before was (2x5) +...

Take a U-shaped piece of pipe, standing upwards. Fill the bottom part with liquid and leave the 'prongs' open. Now slam a parcel of liquid into one end at high speed. The other end will experience some momentum exchange and go pushed upwards. Now take the same test case and add some piping...

Now it is common knowledge that antiparticles destroy particles on collision, and release the same amount of energy as if the masses of the two particles were combined and plugged into E=mc^2. But what about an antiparticle colliding with another antiparticle? Would they have the same effect on...

Hi guys, I'm currently going over Berkerley Review Physics example problem and got confused on a question: Ex. 4.1a : A sharpshooter fires a gun at a wooden block of mass M. If the bullet, of mass (m), becomes lodged inside the block, then which of the following is NOT true? The answer was...

Homework Statement You have two samples of the same gas in the same size container, with the same pressure. The gas in the first container has a kelvin temperature four times that of the gas in the other container. The ratio of number of collisions with the wall in the first container compared...

Say i Have 1. A perfectly spherical and perfectly rigid Ball 2. A perfectly flat and perfectly rigid wall Say i throw the ball at my FLAT wall also giving the ball a linear velocity The only contact with the wall and the ball is a point... a POINT ! So, I can as well forget about the rest of...

I am currently trying to model collisions of rigid balls. I have successfully been able to calculate collisions that only deal with linear momentum, but have run into trouble when I want to calculate angular momentum (e.g. when ballA glances the top of ballB, both balls should start spinning a...

Consider the case in which an incoming particle collides with stationary target particle producing new particles through the interaction. For example, $$e^{-}+e^{+}\rightarrow X+\bar{X}$$ My question is, why in general do the particles produced in such an interaction propagate outwards are...

Just watched a Youtube of a TV show about "weird planets". They show early on a collision between two planets, proportioned about the same as the Earth and the Moon. The interesting thing is that they show part of the "Earth" being pulled up to meet the "Moon." Could this happen? Could it...

The book I'm reading (Spacecraft Systems Engineering) says that there are very few atomic/molecular collisions between components of the atmosphere and spacecraft in LEO or GEO, which means that any heat exchange comes from radiation alone, and the path of the orbit can be modeled as free...

Hi there, A friend of mine is creating a physics engine in java (mostly as a challenge I believe). Today he asked me a question about the results of collisions between objects. For example, imagine that these 2 objects collide: The results of such a collusion would be something like this...

Homework Statement Three perfectly elastic particles A, B, C with masses 4 kg, 2 kg, 3 kg respectively, lie at rest in a straight line on a smooth horizontal table. Particle A is projected towards B with speed 15 m/s and after A has collided with B, B collides with C. Find the velocities of the...

Homework Statement Why is there more heat and sound energy produced with a larger collision? Homework EquationsThe Attempt at a Solution Honestly no clue. I would really appreciate any help! Any videos would also help!

Homework Statement A low-energy particle collides elastically with a stationary particle of the same mass. The angle between the subsequent paths of both particles are 90 degrees. But when a high-energy proton collides with a stationary proton, the angle between the two paths is not 90 degrees...

Sometime ago, in my partial state of sleepiness and being awake (you could call it trance - yo!) I had a thought that during perfectly elastic collisions, it's the deformation of the colliding particles which transfer energy from one to the other. But doesn't that assume that there are empty...

I am taking a physics modeling class and for our projects we need to add in some element to our physics engine that is unique and different. I choose to model the deformation of objects as a result of collisions. For clarification, When things bounce, I want to know by how much do they...

Homework Statement a small 0.199 kg block slides down a frictionless surface through height h = 0.608 m and then sticks to a uniform vertical rod of mass M = 0.398 kg and length d = 2.23 m. The rod pivots about point O through angle θ before momentarily stopping. Find θ. point O is at the end...

Consider a collision between two point particles, with no external forces acting on the system. Linear and angular momentum of the system are always conserved, while the kinetic energy of the system is conserved only if internal forces acting in the collision are conservative. This last point...

Homework Statement Two balls with the same mass are dropped from the same height. After colliding with the ground, one of the balls "A" bounces higher than the other ball "B." Neglect air resistance. Is mechanical energy conserved ? Are they subjected to the same impulse after colliding with...

The problem: A beam of electrons with kinetic energy 12.8 eV collides with a hydrogen target. What visible spectral lines will be emitted due to collisions? My question: I am confident I know how to do the bulk of this question, I am just uncertain about one thing: I know that 12.8 eV is enough...

Homework Statement Find the initial velocity of an alpha particle with a mass of ##6.64 \times 10^{-27} kg## and a charge of ##+3.2 \times 10^{-19} C##, if it undergoes a head on "collision" with a gold nucleus. You may assume the gold nucleus does not move at all during the interaction. The...

Homework Statement In a closed system, in an inelastic collision, momentum and total energy is conserved, but total kinetic energy is not. But how is this possible? If we have a change in total kinetic energy, we have a change in velocity, and so we must have a change in momentum as...

Homework Statement You have an inertia of 52 kg and are standing at rest on an iced-over pond in your skates. Suddenly, your 60-kg brother skates in from the right with x component of velocity -4.9 m/s and collides elastically with you. 1. What is the siblings' relative speed after the...

Hi. The formulae for the velocities of two bodies after a perfectly elastic or inelastic bodies, let's say in 2D, (e.g. billiard) can be derived from three equations: conservation of energy and conservation of momentum in two dimensions. But how do you treat collisions of three or more bodies...

Homework Statement One mole of oxygen at 27°C and at one atmospheric pressure is enclosed in a vessel. Assuming the molecules to be moving with Vrms, find the number of collisions per second which the molecules make with 1 m2 area of the vessel wall. Homework Equations vrms = √(3RT/M) PV = nRT...

Homework Statement A 2.00-kg object is attached to an ideal massless horizontal spring of spring constant 100.0 N/m and is at rest on a frictionless horizontal table. The spring is aligned along the x-axis and is fixed to a peg in the table. Suddenly this mass is struck by another 2.00-kg...

Homework Statement Two equal mass hockey pucks undergo a glancing collision. Puck 1 is initially at rest and is struck by puck 2 traveling at a velocity of 13 m/s[E]. Puck 1 travels at an angle of [E18N] after the collision. Puck 2 travels at an angle of [E4S]. Determine the final velocity...

Please be patient with my ignorance. :) I have just learned in the LHC's own website ( http://lhc-machine-outreach.web.cern.ch/lhc-machine-outreach/beam.htm ) that their proton beams traveling at 0.999999991c carry about 362 MJ of energy, equivalent to 77.4 kg of TNT. These beams seem to be...

Hello everyone, here's the problem Homework Statement A pole with mass m2 = 2 Kg is planted on the ground with a consecutive hammer hits. The hammer ha a mass m1 = 4 kg and is dropped from 1 meter upon the pole. With a single hit the pole penetrate the ground of 2 cm. Find: a) the total...

Homework Statement EDIT: DO NOT READ. I SOLVED IT.[/B] The collision in this problem acts at point C and acts a purely horizontal force in the inertial frame of reference. Homework Equations The Attempt at a Solution I understand the maths that is at work here, when we resolve the force...

A 2-kg ball is moving at 3 m/s toward the right. It elastically collides with a 4-kg ball that is initially at rest. Calculate the velocities of the balls after the collision. I know that kinetic energy is conserved in elastic conditions, but I don't know how to use that to calculate this. I...

I'm using Chaisson'/McMillan's "Astronomy, a Beginner's Guide to the Universe"/7th Edition In Chapter 7, it describes the gas giants, and says that Jupiter, Uranus, and Neptune all have "86% Hydrogen, 14% Helium" in their atmospheres, while Saturn has about 92% hydrogen, and 7% Helium, in its...

Homework Statement Three particles, A, B, and C, with masses M, 2M, and 3M respectively, lie at rest in that order in a straight line on a smooth horizontal table. The particle A is then projected directly towards B with velocity U. Assuming the collisions are perfectly elastic, I need to find...

Homework Statement A ball with the mass 0.48kg is hanging on a string. The ball is moved to the side and then released . When the string is vertical, the ball hits the side of a block which is at rest . The ball's position is then 1.5 lower down than from the beginning. a) the speed gets the...

Hi all! I'm developping a program, I wish if somebody helps me since I'm not good in physics, we know that: v'1=v1-(j / m1)*n v'1=v2+(j / m2)*n 1) when we use negative and positive sign? if we change them, there is error sometimes. 2)In 2d, do I have to calculate vx, and vy separately, what...

How do collisions occur between different particles when the field excitements that make them are not the same? Also how do you collide when the field are the same? Wouldn't the values of the field just increase until the particles pass through each other? (Like a constructive wave). What I mean...

Homework Statement A small mirror of area A and mass m is suspended in a vertical plane by a weightless string. A beam of light of intensity I falls normally on the mirror and the string is deflected from the vertical by a very small angle A. Assuming the mirror to be perfectly reflecting, to...

Homework Statement http://www.pdx.edu/physics/sites/www.pdx.edu.physics/files/Nov-19th_version_Comprehensive%20Exam%20I_Nov-2006.pdf Homework EquationsThe Attempt at a Solution This problem is driving me nuts. Its the problem number 1 in the afternoon session exam provided in the link above...

Homework Statement One end of a spring is attached to a wall to a block of mass X= 2kg (on a frictionless horizontal table). Another mass M of 150g moving at a speed of 7m/s collides (inelastic). This takes 0.4s to compress the spring to its max compression. I have to find the max force of...