Read about collisions | 29 Discussions | Page 1

  1. greenrichy

    Reasons for a gain of momentum during a collision

    I've come up with the following causes: - air resistance - parallax - during the collision, some of the kinetic energy gets converted into thermal energy. - invisible deformations But I'm not sure which would be the biggest effect on the total momentum change. Are there any other reasons that...
  2. Thorscira

    Expression for effective potential energy

    << Mentor Note -- Poster has been reminded to use the Template when starting new schoolwork threads >> Two particles of identical mass m interact with each other via central potential energy Vcentral(r) = -V0(1-|r|/a), if 0 <= |r| <= a 0, if a < |r| Constants are V0 > 0...
  3. R

    The problem of excitation of vibrations during collisions

    Homework Statement Dear colleagues, my problem is following: The ball of mass with the initial velocity collides with a system of two identical balls of mass each, connected by a massless hookean spring with stiffness and length . It is necessary to find the final velocities of the...
  4. Stitch1775

    Momentum and collisions homework help

    I need help, ive been staring at this problem for over an hour and trying to find similar problems online with no luck. A 65 kg person is skiing down a hill. The skier's speed at the bottom is 15 m/s. If the skier hits a snowdrift and stops in .30s A)how far does the skier go into the drift...
  5. P

    Final velocities of two objects in a 2D elastic collision

    Homework Statement An atomic nucleous of mass m travelling with speed v collides elastically with a target particle of mass 3.0m (initially at rest) and is scattered at 45o (a). What are the final speeds of the two particles? Advice: eliminate the target particle's recoil angle by...
  6. phantom lancer

    Physics Word Problem: Arrow and moving target collision

    Homework Statement Find the 2 unknown variables.[/B] Homework Equations Am I doing this right? Can someone help me find the solution?[/B] The Attempt at a Solution To compute for the velocity of the target/arrow combination immediately after the collision...
  7. C

    B Collision in moving water-angle of rebound

    Hi all! I was having a conversation with a (rather young) friend about the following imaginary situation- suppose you are in a helicopter, at rest relative to the ground. So you are basically seeing a 'top' view. Say you have a a wall fixed to the ground, and it is kept in the middle of a moving...
  8. R

    Elastic collisions and Newton's third law

    Hi everyone, I am new to this forum, and I'm having a hard time understanding Newton's third law and collisions, first of all I want to say that it is not homework and that I do know the basics of physics, vectors, energy, work, and momentum I also know and understand Newton's first and second...
  9. unseeingdog

    B Coefficient of Restitution in x and y

    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...
  10. gelfand

    Conservation of momentum, collisions - what about friction?

    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## travelling with speed ##u## to the right. Find the speed and direction...
  11. S

    I What is the significance of calculating the average value of cos?

    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...
  12. Likith D

    B Does Normal force always HAVE to be perpendicular to plane ?

    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...
  13. A

    I Angular Momentum of colliding balls

    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...
  14. bebop1

    Kinetic Energy and Collision Question

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

    Collision involving angular and linear motion

    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...
  16. B

    Amplitude and Period of Oscillation from Collision

    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...
  17. M

    2D Collision using momentum

    Homework Statement Two equal mass hockey pucks undergo a glancing collision. Puck 1 is initially at rest and is struck by puck 2 travelling 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...
  18. J

    Saturn: Helium Rain, or non-indigenous planet?

    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...
  19. B

    SHM and Conservation of Energy/Momentum

    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...
  20. C

    Conservation of Momentum of two trolleys

    Homework Statement There are two trolleys travelling in the same direction which are about to collide. Trolley 1 is travelling at 4 metres per second and has a mass of 2kg The other, Trolley 2, (which is in front) is moving a 1 metre per second and has a mass of 4kg. After the impact, they...
  21. P

    Coefficient of restitution and velocity

    We know that the ratio of velocity of separation to the velocity of approach of two bodies in a head on collision is called coefficient of restitution .Is there no possibility that the velocity of separation is quite larger than that of approach? or vice versa? can't the ratio be more than 1 or...
  22. cvex

    How to calculate velocities/forces from sphere collisions?

    Hi, Basically I have a point cloud that represents balls with different radii. They are all moving based on forces and sometimes they are intersecting with each other. Imagine the yellow ball is going in one direction while the blue balls goes in another direction. At one time they are...
  23. Valerie Prowse

    Conservation of momentum question - elastic collisions

    Homework Statement A 2.0 kg ball moving with a speed of 3.0 m/s hits, elastically, an identical stationary ball as shown. If the first ball moves away with angle 30° to the original path, determine a. the speed of the first ball after the collision. b. the speed and direction of the second...
  24. N

    Simple collision between rocks in outer space. Webassign

    Homework Statement [/B] Two rocks collide in outer space. Before the collision, one rock had mass 14 kg and velocity ‹4450, −2950, 2250› m/s. The other rock had mass 7 kg and velocity ‹−600, 1900,3600› m/s. A 1 kg chunk of the first rock breaks off and sticks to the second rock. After the...
  25. Xsnac

    Collision problem

    Homework Statement a ball of mass 0.1 kg, is free falling from the height (h1) of 1 m. hits the ground with a k = 0.5. ##k=\frac{v_2}{v_1}## A)Height that the ball will reach after the hit. B)The heat quanity released by collision Homework Equations I think ##mgh## and ## \frac{mv^2} {2} ##...
  26. R

    Energy transfer in Newton's cradle

    Homework Statement Three balls of masses m1, m2 and m3 are suspended in a horizontal line by light wires and are almost touching. The mass m1 is given a horizontal velocity v so that it collides head-on with the mass m2. Find an expression for the final kinetic energy of m3? What value of m2...
  27. A

    What happens when a particle collides with a Black Hole?

    Now I know that in the general Schwarzschild metric, there is energy and angular momentum conservation, but what I'm wondering is if there is any linear momentum conservation. Let's say a particle collides with a black hole. Does the energy of that particle go solely to the rest mass and...
  28. S

    Maximum rest mass in particle collision

    Homework Statement Suppose that a certain accelerator can give protons a kinetic energy of 200 GeV. The rest mass of a proton is 0.938 Gev/c^2. Calculate the largest possible rest mass M0 of a particle that could be produced by the impact of one of the high-energy protons on a stationary...
  29. A

    Rubber ball collision

    Homework Statement Homework Equations p=mv[/B] The Attempt at a Solution My thoughts- Answer is C as KE is not conserved since velocity of ball has decreased. Option A also seems correct.[/B]
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