Elastic collision Definition and 523 Threads

okay i have a problem that deals with an elastic collision. so i have the mass of obj A and B and i found the initial velocity of A and B, and i have the final velocity of A and B so now i want to find the change in Kinetic Energy, so i am doing .5(mA + mB)( velocity final ^2) - .5(mA + mB)(...

Homework Statement there are two masses, the smaller sitting still, and the larger with 5 times the mass of the smaller hits it going 12 m/s. the smaller rebounds at an 80 degree angle from the direction of the original mass. the collision is elastic. find the speed of both objects and the...

Homework Statement The mass m1 has the velocity (v1i)\hat{i} and makes an off-center collision with m2=2m1. The final velocities are v1f=a1\hat{i}+b1\hat{j}, and v2f=a2\hat{i}+b2\hat{j}. Assuming elastic collision and v2i=0m/s, obtain the values of a1, a2, and b2 for the given value of b1...

Homework Statement Two identical pucks are on an air table. Puck A has an initial velocity of 2.6 m/s in the positive x-direction. Puck B is at rest. Puck A collides elastically with puck B and A moves off at 2.50 m/s at an angle of +16.3° above the x-axis. What is the speed and direction of...

Initial velocities and masses of the objects colliding...?

Homework Statement Assume an elastic collision (ignoring friction and rotational motion). A queue ball initially moving at 2.2 m/s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball's final speed is 0.61 m/s. Find the queue ball's angle \theta...

A 10.0 g object moving to the right at 22.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 32.0 cm/s. Find the velocity of each object after the collision. First, I converted the masses to kg and the velocities to m/s. I used m1v1i + m2v2i =...

Homework Statement Consider the electron-proton elastic collision. Prove that the expression for the energy of the outgoing electron is E_f= \frac{E}{1+(2E/Mc^2)sin^2(\theta /2)} where E_f is the energy of the outgoing electron, E is the energy of the incident electron, M is the proton...

Problem: "A ball with the mass of .440 kg moving east (+x direction) with a speed of 3.70 m/s collides head-on with a .220 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each object after the collision? Relevant equations. Conservation of...

I just want to know if I am approaching this question correctly. Homework Statement Two marble spheres of masses 30 and 20 grams, respectively, are suspended from the ceiling by massless strings (.95m long). The lighter sphere is pulled aside through an angle of 75 degrees and let go. It...

A 0.45 kg ice puck, moving east with a speed of 3 m/s, has a head-on collision with a 0.9 kg ice puck. Assuming a perfectly elastic collision, what will be the speed and direction of each object? Alright, so the first time i go through this problem i solve it, no problem. the answer is 1 m/s...

Homework Statement Canadian nuclear reactors use heavy water moderators in which elastic collisions occur between neutrons and deuterons of mass 2.0u. a.) What is the speed of a neutron expressed as a fraction of its original speed, after a head-on elastic collision with a deuteron which is...

Homework Statement Consider a head-on, elastic collision between two bodies whose masses are m and M, with m << M. It is well known that if m has speed v0 and M is initially at rest, m will bounce straight back with its speed unchanged, while M will remain at rest (to an excellent...

Homework Statement Two spheres of equal radius and masses 5.00 kg and 15.0 kg are sliding towards each other along the same straight line across a frictionless, horizontal surface. Vi1 = 15.0 m/s and Vi2= -9.00 m/s, respectively. During the collision, 25% of the total initial kinetic energy...

Homework Statement Two balls, Ball A on the left, and Ball B on the right, are moving towards each other. Ball A is much bigger and heavier than Ball B. Ball A is moving with speed x, and Ball B is moving with speed y. They collide, and an elastic collision occurs, sending Ball B rebounding...

If momentum is conserved in a collision. Does this indicate conclusively that the collision is elastic? This is what i concluded but i think i am wrong No, it does not indicate that the collision is conclusively elastic. For an elastic collision to occur both the law of conservation of...

Homework Statement A bullet of mass m is shot into a block of mass M that rests on a rough surface with coefficient of kinetic friction k. The block slides for a distance of x meters before coming to a stop. Derive an expression for the initial velocity of the bullet. Homework Equations...

Homework Statement A target glider, whose mass m_2 is 350g is at rest on an air track, a distance d =53cm from the end of the track. A projectile glider whose mass m_1 is 590g approaches the target flider with velocity v_{1i} = -75 cm/s and collides elastically with it. The target...

Let two particles collide. Particle 1 has initial velocity v, directed to the right, and particle 2 is initially stationary. Now assume that the mass of particle 1 is 2m, while the mass of particle 2 remains m. If the collision is elastic, what are the final velocities v1 and v2 of particles 1...

Homework Statement A collision occurs between two football players. Player 1 has mass of 75 kg and a velocity of 6 m/s. Player 2 has mass of 150 kg and a velocity of -3 m/s. Assuming an ELASTIC collision, what is the final velocity of player 2? Homework Equations They gave us this...

Homework Statement A 6.0 kg cart moving at 6.0 m/s collides with a 2.0 kg cart moving at 2.0 m/s in the same direction on the same track. The collision is cushioned by a perfectly elastic bumper attached to one of the carts. What are the velocities of the carts after the collision? What was...

Homework Statement A moving shuffleboard puck has a glancing collision with a stationary puck of the same mass. If friction is negligible, what are the speeds of the pucks after the collision? http://img179.imageshack.us/img179/277/phyqp2.jpg The Attempt at a Solution I ended up with...

A ball drops to the floor and bounces,eventually coming to rest.Collisions between the ball and floor are elastic;the speed after each collision is e times the speed before collision where e<1.If speed just before 1st bounce is v,find the time taken to come to rest.

Homework Statement A 4 kg block moving to the right at 6 m/s collides elastically with a 2 kg block moving to the right at 3 m/s. Find the final velocities and the initial and final energies. Show all your work. [ignore external forces] Homework Equations In an elastic collision...

Homework Statement A mass of .59 kg and a velocity of - 0.75 m/s approaches a stationary mass of 0.35 kg that is 53 cm away from the edge of a wall. The stationary (m2) pushes against a spring (elastic collision) that is within the 53cm of separation and reverses direction. How far from the...

280kg ball has elastic collision with 2nd ball which is initially at rest. Then 2nd ball moves with .5 velocity of 1st ball - what is mass of the 2nd ball? what percentage of KE gets transferred to 2nd ball Homework Equations I believe i use m1v1 + m2v2 = m1v1 +m2v2 (before & after)...

Homework Statement A 45 g steel marble collides obliquely w/ an identical stationary marble, and continues at 55 degrees to its original direction. The collision is perfectly elastic. What is the angle between the direction taken by the target ball and the original direction of the incident...

Hey, I'm having problems with this: A particle m with initial speed V1 collides with a particle at rest with mass 3m. After collision, particle with mass m is seen moving 30 degrees from its initial direction. What is the angle of motion of the 2nd particle after collision? I can get three...

Other than finding the intial xy coordinates and knowing gravity as a factor I am not sure where to go with this problem as the formulas I have deal with final angles and not initial. The problem follows: Two spheres of mass 1kg & 1.5Kg hang @ rest at the ends of strings that are both 1.5m...

I also cross-posted this on another website (http://www.dance.net/topic/5577521/1/Homework-Help/Physics-dilemma-Elastic-Collisions.html"), so I'll just copy & paste. I got three completely different answers while using equally legitimate formulas (formulae)? This is on elastic collisions...

Problem Involving Elastic Collision... There are two ball that are both 10kg. The velocity of ball 1 is 10 m/s and the velocity of ball 2 is 40 m/s in the opposite direction of ball 1. They collide to form an elastic collision. Determine speed of both balls after collision? Am I starting...

Ok, I ran across this question as I was doing my homework and I thought it looked pretty easy. I worked on it for an hour and still had no luck with getting the correct answer. Here is the full text: An elastic collision occurs between two air hockey pucks in which one puck is at rest and the...

Two blocks are free to slide along a frictionless wooden track. A block of mass m1=5 kg is released from point A. Protruding from its front end is the north pole of a strong magnet, repelling the north pole of an identical magnet embedded in the back end of the block of mass m2=10 kg, initially...

Ball #1 moving at a speed of +4.4 m/s along x-axis collides with an identical ball (#2). The initial velocity of ball #2 is equal to zero. Assume that this is a perfectly elastic collision. I know that Pbefore = Pafter - but since I'm not given the mass of either ball how am I to know what...

A 4.0 kg firework is tossed onto a hockey rink. As it slides, it explodes into exactly two 2 kg pieces. There is an x-y coordinate system painted under the ice. One part of the exploded firework has velocity 3.0 m/s along the y direction. The other part has a velocity of 5.0 m/s at an angle of...

2 blocks are free to slide along the frictionless wooden track. The block of mass m1=5.00 kg is released from A, while the block of mass m2= 10.0 kg initially sits @bottom of ramp. The blocks collide @ position Bin a perfectly elastic collision. To what height does m1 rise after collision...

I am having a lot of difficulty with this problem: Consider a frictionless track as shown in Figure P6.48. A block of mass m1 = 4.20 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 10.5 kg that is initially at rest. Calculate the maximum height to...

From the pictures(my solutions) I submitted, I know that I can straightly find the magnitude of the velocity of the puck B by using conservation of energy in the lab frame. However, my gut feelings tell me that answering the question using conservation of energy in the moving frame (puck A)...

I have a problem here. I got "answers", but I don't believe they are correct and I have no idea where I went wrong. The question is... "Determine the speed V_2 (V sub 2) of the larger mass after the collision and Theta 1 and Theta 2. mass of smaller particle = m mass of larger particle =...

I think I'm getting lost in the numbers somewhere here. Two astronauts, one of mass 60 kg and the other 84 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 10 m? m1= 60 kg m2=84 kg X initial = 0 X1...

Q: A bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length l and negligible mass. What is the minimum value of v such that the pundulum bob will barely swing through a...

Two blocks are free to slide along a frictionless wooden track ABC as shown in Figure P9.20. The block of mass m1 = 5.07 kg is released from A. Protruding from its front end is the north pole of a strong magnet, repelling the north pole of an identical magnet embedded in the back end of the...

In an elastic collision both momentum and kinetic energy are conserved which means only conservative forces are acting (therefore no friction!). So that must mean we also have to be in an isolated system, so no energy is lost due to external forces. Can this state actually exist in reality...

A ball of mass m and a ball of unknown mass M approach each other from opposite directions and have the same speed Vo (but oppositely directed velocities). The ball of M is reduced to rest by the impact, while the ball of mass m has a velocity V1'. What are the ratios a) M / m b) V1' / Vo...

(3) two blocks are free to slide along the frictionless wooden track. a block of mass m1=5.00kg is released from A. Protruding from its front end is the north pole of a strong magnet, repelling the north pole of an identical magnet embedded in the back end of the block of mass m2=10.0kg...

Once again, I am pleading for help. Here is the problem and what I have done: Gayle runs at a speed of 4.00 m/s and dives on a sled, initially at rest, on the top of a frictionless, snow-covered hill. After she has descended a vertical distance of 5.00m, her brother, who is initially at rest...

Say we have a point mass M traveling to the right at velocity V. It strikes a dumbell composed of two masses of M/2 separated by a massless rod of length L. The collision is elastic. I am having some trouble thinking about this... After the collision, the original mass is stationary...

I've done the bulk of this problem (part A) but I still can't figure the last bit (part B): "Consider an elastic head-on collision between a projectile with mass m_a, velocity (vector)v_a, energy E_a, and three-momentum (vector)p_a and a stationary target of mass m_b. (That the collision is...

Does anyone know the equations for 2D elastic collisions.

Let's say I have a stationary object that gets hit on a flat edge by a sharp point of a moving object. Assume that the moving object also has an linear and angular momentum. Assume that the objects have uniform density, there is no deformation, no friction, and that the collision is ellastic...