# collision

1. ### Simultaneous Inelastic Collision

The world is 2D. I am given three different balls that simultaneously collide. I know their velocity(both x and y) before impact and two of the balls' initial positions. The collision is perfectly inelastic and the three balls stopped upon collision. How do I determine the initial...
2. ### Elastic Collision in One Dimention

I was told that my percentages of discrepancy are wrong for this problem. I felt like that was the easiest and most straightforward part of the problem, so I am wondering if I did anything else wrong. I was told that all of my answers were correct (except the predictions, no feedback) besides...
3. ### Bunch collision frequency

Hey guys, so I am asked to prove that the luminosity of two colliding beams, where the bunches are described by Gaussians, is: L = f*Nb*N1*N2/(4*pi*sigma_x*sigma_y) (see eq. 16 in link: https://cds.cern.ch/record/941318/files/p361.pdf) Where f=revolution frequency (I imagine this is the...
4. ### What are the collision forces applied to the stops in a moving triple pendulum?

Hello, it's been a while since I did not use lagrangian mechanics and all this stuff and would bet it's needed for my purpose. Introduction : if I take a simple pendulum and make it collide on its origin with a stop, how much will suffer the stop ? Knowing that the pendulum is subject to an...
5. ### Collision problem

Hey, guys. I have problems with this exercise. https://ibb.co/b4PiQk I thought that the linear momentum would remain conserved and then i wrote the equation for the conservation of the total mechanical energy. But I don't know how to continue because actually I didnt understand what the...
6. ### A question of type of collision

Hi everyone, My question concerns not the solution to a particular problem on collisions, but rather given the definition of the problem I cannot decide what type of collision is being described and so I cannot subsequently attempt to solve the problem correctly. Basically can anyone tell me...
7. ### Inelastic collision

Car A with a mass of 1000kg is travelling east at 15m/s when it collides with car B, 2000kg, travelling north at 5m/s. After the collision, the two cars stick together and have the same velocity. No friction. What is the final velocity and the direction and magnitude?
8. ### Collision problem

Hi everybody ... I have a problem and although I have worked on it for a number of hours now I cannot get what the book says is the correct solution ... and I cannot see where I am going wrong. Details of the problem are ... Just before it is struck by a racket, a tennis ball weighing 0.560...
9. ### velocity after first and second collision

three small spheres, A , B and C with mass of 3kg , 4kg , 7kg respectively are arranged as shown in the figure. Initially , sphere B is placed in static condition,while the sphere A is moving with a velocity of 4u towards B and collides . Then , sphere C move to right with velocity u , the...
10. ### determine the velocity after collision

three small spheres, A , B and C with mass of 3kg , 4kg , 7kg respectively are arranged as shown in the figure. Initially , sphere B is placed in static condition,while the sphere A is moving with a velocity of 4u towards B and collides . Then , sphere C move to right with velocity u , the...
11. ### Change in linear momentum during collision

Hi my name is Aleks, I'm taking a freshman Mechanics course. I'm facing a problem where neither an impulse approach or a collisions in one dimension approach seem to get the right answer. I may have put an incorrect value or mixed up a couple of equations. The question is: A super ball with a...
12. ### A collision between Mars and Jupiter

Hello, A few years back I had the idea that the topography of Mars could have been largely created by a close encounter with Jupiter. I posted it on several forums and got some great responses. (And some angry trolls, but hey it is the internet so what can you do) The introduction video to...
13. ### Hi, I am trying to figure out the power of a automobile collision.

So to keep the math simple. a 1000 kg car hits a object while moving at 20 km/h. The impact lasts for 1 foot where the object is accelerated to 20 km/h. 1000kg(5.556 m/s – 0 m/s)/0.055s = 101018 Newton’s of force so because that impact was only for .3048 meters can I multiply newtons by meters...
14. ### Differential collision cross section

Derive the differential collision cross section for hard-sphere particles of diameters d1 and d2. So I tried to work this out on paper and I *think* I got somewhere but I'm not 100% sure. Basically, I assumed the problem could be solved the same way as a particle colliding with only 1 hard...
15. ### Collision, average acceleration

So I have this problem, a car traveling 70km/h collides with an immovable wall and the front of the car crumples by .94m. What average force must the seatbelt exert during the collision on a 75-kg passenger to keep the person in-place? I read the solution given and it uses energy...
16. ### Simultaneous collision of 3 balls

The world is 2D. I am given three equal balls (disks) that simultaneously collide. I know their velocity right before impact. These are arbitrary and labeled v1, v2 and v3. The collision is perfectly elastic. How do I determine the final velocities after impact for each ball? When I write...
17. ### collision

Romeo (77.0 kg) entertains Juliet (56.0 kg) by playing his guitar from the rear of their boat at rest in still water, 3.30 m away from Juliet, who is in the front of the boat. After the serenade, Juliet carefully moves to the rear of the boat (away from shore) to plant a kiss on Romeo's cheek...
18. ### Collision between accelerating objects?

Hello! I am currently working on a programming project that involves some physics and I need some help with collisions. I know that if the objects have an acceleration = 0, meaning they each have a net force of 0, then conservation of momentum and energy will get me the post-collision...
19. ### Elastic Collision Problem

A cart with mass 0.340 kg moving on a frictionless linear air track at 1.2 m/s strikes a second cart of unknown mass at rest. The collision between the two carts is elastic. After the collision, the first cart continues in its original direction at 0.66 m/s. a) What is the mass of the second...
20. ### inelastic collision

My question should be piece of cake, since it's a simple question about the kinetic energy lost in a completely inelastic collision, so let's get to it: As i understand it the MAXIMUM amount of kinetic energy able to be lost in a collision, is lost if the collision is what we call completely...