Collision Definition and 1000 Threads

  1. J

    Collision & Impact Homework: ClarkGriswold, 30m/s, 50kg, 20kg, 15kg

    Homework Statement A car moving at 30 m/s has a collision and comes to rest in 0.1 seconds. The driver, ClarkGriswold, is brought to rest by an air bag in 0.13s. The driver has a mass of 50 kg. 1) What average force is exerted by the air bag on the driver ? 3) How far does the driver travel...
  2. J

    How Far Will the Spring Compress in a Frictionless Collision?

    Homework Statement A 2 kg block collides with a massless spring of spring constant 94 N/m attached to a wall. The speed of the block was observed to be 1.4 m/s at the moment of collision. The acceleration of gravity is 9.8 m/s 2 . How far does the spring compress if the surface on which the...
  3. Q

    Maximum height after a collision (general solution)

    Here's the situation: A small block of wood of inertia mb is released from rest a distance h above the ground, directly above your head. You decide to shoot it with your pellet gun, which fires a pellet of inertia mp. After the block has fallen a distance d, the pellet hits it and becomes...
  4. CalebB-M

    Two dimensional Elastic Collision

    Homework Statement [/B] The problem statement is: A helium atom traveling at a speed of 240 m/s hits an oxygen atom at rest. If the helium atom rebounds elastically, from the oxygen atom at an angle of 90° with respect to the original direction of motion, what are the final velocities of both...
  5. V

    Solving a Hockey Puck Collision: Final Velocity

    Homework Statement A hockey puck of mass 0.16kg has initial velocity of 2.0m/s[E] and collides with another puck that is initially at rest, has mass of 0.17kg. Once they collide the first puck travels 1.5m/s[N 31 E]. Find final velocity of second puck. Homework EquationsThe Attempt at a...
  6. J

    Finding velocity and work of a collision

    Homework Statement Two 2.5 kg bodies, A and B, collide. The velocities before the collision are ##\vec{v}_A = \left( 50 \hat{i} + 50 \hat{j} \right)~m/s## and ##\vec{v}_B = \left( 38 \hat{i} + 2.3 \hat{j} \right)~m/s##. After the collision, ##\vec{v}'_A = \left( 10 \hat{i} + 9.4 \hat{j}...
  7. J

    Elastic collision with pendulum

    Homework Statement A steel ball of mass 0.890 kg is fastened to a cord that is 50.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in the figure. At the bottom of its path, the ball strikes a 2.50 kg steel block initially at rest on a...
  8. G

    Finding velocity upon collision

    Homework Statement A football player (90 kg) moving east collides with another football player (80 kg) moving north. When both players collide, a helmet (2 kg) is ejected south at a velocity of 5 m/s. If both players fall to the ground and slide a distance of 2 m North-East with a friction...
  9. C

    Where does kinetic energy go in inelastic collision?

    I'm having a bit of trouble conceptualizing this. I've looked all over the Internet, and I've been seeing that in completely inelastic collisions the reason that kinetic energy is not conserved is because energy goes into deformation, sound, propelling shrapnel, and especially heat (among other...
  10. R

    Python Really simple Python program to simulate inelastic collision

    I'm trying to write this Python program that simulates a completely inelastic collision between two objects. The program seems to work for the most part, but I'm completely lost on the "heat released" part at the end. I have no idea if I'm calculating this right, or if I'm completely wrong. Can...
  11. H

    2D elastic collision in CM Frame, velocities antiparallel?

    Homework Statement Why are the Center of Momentum velocities of masses after a 2D elastic collision anti-parallel? (as in the following diagram) Homework Equations CM_Velocity = (∑m_i*v_i)/(∑m_i) The Attempt at a Solution This is not actually a problem I have to do. I am just looking for a...
  12. O

    2-D Linear Momentum, Collision Problem

    Good evening! I'm having trouble completing an assignment related to inelastic collisions and momentum. Homework Statement Here is the statement: You are in great shape on this hot July morning. You are working as an intern for the Montreal Police (SPVM) Collision Investigation unit. You...
  13. A

    Probability of cosine of angle between two directions in collision

    The question refers to the Feynman lectures on physics Vol I chapter 39. He discusses collisions between gas molecules. Here is a relevant extract: They are equally likely to go in all directions, but how do we say that? There is of course no likelihood that they will go in any specific...
  14. S

    Speed of object after collision related to spring

    Homework Statement As shown in the figure below, object A (mass: m) is at rest on a smooth, horizontal surface, and a lightweight spring that compress / stretches in the horizontal direction is attached to it. Object B, which has the same mass m, approaches A from the left side with speed v and...
  15. terryds

    Collision Problem: Determining Mass of Ball

    Homework Statement Two titanium balls approaches each other with same speed and then collides elastically. After the colision, one of the ball which mass is 300 g becomes motionless. Determine the mass of another ball Homework Equations Conservation of momentum and energy The Attempt at a...
  16. J

    B Collision of identical fermions

    What happens if I shoot a fermion at another identical fermion at rest? For example, do the fermions stick together, or do they bounce? Let's ignore gravity, electro-magnetism, weak force and strong force. Edit: We are considering the Pauli exclusion principle.
  17. A

    Car collision: decomposing momentum in x- and y-direction

    Homework Statement Two cars collide at an intersection. Car A, with mass 2000 kg, is going from west to east, while car B, with mass 1500 kg, is going from north to south at 15 m/s. As a result of this collision, the two cars become enmeshed and move as one afterward. In your role as an expert...
  18. E

    Two sphere collision -- What's the speed?

    Homework Statement Two solid spheres hung by thin threads from a horizontal support (Figure 1) are initially in contact with each other. Sphere 1 has inertia m1 = 0.040 kg , and sphere 2 has inertia m2 = 0.10 kg. When pulled to the left and released, sphere 1 collides elastically with sphere 2...
  19. E

    How Do You Determine the Inertia of Cart A?

    Homework Statement A 1-kg standard cart collides with a cart A of unknown inertia. Both carts appear to be rolling with significant wheel friction because their velocities change with time as shown graph below: What is the inertia of cart A? Homework Equations i am unsure how to even solve for...
  20. E

    Inelastic collision: final velocity after collision

    Homework Statement You are driving your 1000-kg car at a velocity of(19 m/s )ι^ when a 9.0-g bug splatters on your windshield. Before the collision, the bug was traveling at a velocity of (-1.5 m/s )ι^. What is the change in velocity of the car due to its encounter with the bug?Homework...
  21. F

    Sign convention problem in momentum calulations

    Homework Statement Particle A has a mass of 1kg and velocity 2x10^8m/s to the right and collides with a stationary particle B that has a mass of 4kg. after the collision, particle A moves to the left with a velocity(v) and particle B moves to the right with a velocity of 1x10^7 m/s. calcuate...
  22. J

    I Limiting behavior of quantum elastic collision

    From the hyperphysics site http://hyperphysics.phy-astr.gsu.edu/hbase/elacol2.html#c1 on classical elastic collisions I see that if an incoming particle of mass ##m_1## with velocity ##v_1## collides into a stationary target particle of mass ##m_2## then the velocity of the target particle after...
  23. D

    Length covered by block after collision

    Homework Statement Board ##A## is placed on board ##B## as shown. Both boards slide, without moving w.r.t each other, along a frictionless horizontal surface at a speed of ##6 \text{m/s}##. Board ##B## hits a resulting board ##C##, "head-on". After the collision, board ##B## and ##C## stick...
  24. ChrisBrandsborg

    Will the Tractor and Tesla Avoid a Collision on the Mountain Road?

    Homework Statement Problem 5: Collision course A huge tractor and a Tesla full of school children come driving along a winding mountain road, in opposite directions. The tractor has a speed of 40.0km/h and the car zooms along with 80.0 km/h. The Tesla suddenly comes around a corner, sees the...
  25. Author_X

    Backstory Help: Asteroid Collision in California

    I am currently working on the backstory to a story I'm writing as a means of world-building. However, I'm not quite as physics-literate as everyone else, so rather than winging it and coming off like an idiot, I came here. http://sta.sh/0126svntmin Exhibit A. The red marks the range of the...
  26. P

    Energy transfer in elastic collision.

    How do I derive the energy transfer equation in an elastic collision of two bodies of masses m and M respectively,using the energy and momentum conservation relations in the laboratory frame? $$\frac{1}{2} m_1 v_0^2 = \frac 1 2 m_1 v^2 + \frac 1 2 m_2 V^2$$ $$m_1 v \cos(\phi)=m_1 v_0 -m_2 V...
  27. A

    Two vehicles braking to avoid a collision

    A tractor and a Tesla drives in opposite directions. The tractor has a speed of 40.0km/h and the car has a speed of 80.0 km/h. The Tesla suddenly sees the tractor, and they both immediately start braking, both with constant accelerations of 5.00 m/s2 (opposite to their directions of motion)...
  28. C

    Time of collision of two lead spheres

    Homework Statement Two uniform lead spheres each have mass 5000kg and radius 47cm. They are released from rest with their centres 1m apart and move under their mutual gravitational attraction. Show that they will collide in less than 425s. Homework Equations By Gauss' Law, force on a sphere...
  29. Erenjaeger

    Momentum, collision of two cars problem

    Homework Statement A 3.0 kg cart moving to the right with a speed of 1.0 m/s has a head-on collision with a 5.0 kg cart that is initially moving to the left with a speed of 2.0 m/s. After the collision, the 3.0 kg cart is moving to the left with a speed of 1.0 m/s. What is the final velocity of...
  30. I

    Elastic Collision: Understanding the Role of Positive and Negative Signs

    Hi guys. There is a question that confusing me for a long time. If an elastic collision occur, do I need to consider the positive and negative sign?? According to my teacher, an object moves in the opposite direction we need to consider the sign. Is it works in this situation?
  31. UnterKo

    Can Gravity Make a Hoop Rise Off Its Support When Beads Slide Down?

    Hello, I've got a problem and I have no idea how to start. I'll be happy for any hint. Thanks Homework Statement Two beads each of mass m are at the top (Z) of a frictionless hoop of mass M and radius R which lies in the vertical plane. The hoop is supported by a frictionless vertical support...
  32. X

    Inelastic Collision: Kinetic Energy vs Momentum

    In an inelastic collision is the change in kinetic energy equal to the difference of final and initial momentum if one of the objects is initially at rest? For example: m1v = (m1+m2)Vf -----> 0 = (m1+m2)Vf - m1v1 1/2(m1+m2)Vf^2 - 1/2m1v^2 = (m1+m2)Vf - m1v1 Or totally wrong? Thanks!
  33. B

    I Helium Ion collision with diamond wafer

    If a Helium ion He+ collides with a diamond wafer surface, an insulator, does the Helium ion, at 25 deg C, will the ion lose it's charge by gaining an electron from the insulative surface or does the ion have an elastic collision with no net energy loss or gain?
  34. JWA

    Angular-Linear Momentum Collisions

    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...
  35. A

    Solve for 2D Elastic Collision: Find θ & φ Angles

    Homework Statement A 2D elastic collision: Two pucks (masses m1 = 0.5 kg and m2 = 0.3 kg) collide on a frictionless air-hockey table. Puck 1 has an initial velocity of 4 m/s in the positive x direction and a final velocity of 2 m/s in an unknown direction, θ. Puck 2 is initially at rest. Find...
  36. A

    How to find the sound power in a collision?

    How would you go about calculating the sound power and sound pressure given the pressure (as in collisions [force/area]) of the collision, kinetic energy in the collision, velocities of both objects, densities and masses. Is this possible? Is the pressure of the collision equal to the sound...
  37. C

    A momentum question following collision

    I think this is a basic question, at least I would hope so. If two identical motorcycles are going at the same speed but one has a lighter individual. If each individually collides with a stationary object and the driver is ejected. Who will go further and why?
  38. H

    Collision and time to stop a block

    [Moderator note: Misplaced homework moved from General Physics, so no template shown] For the part on finding the total time the block spend moving, the answer is ##\frac{v_0}{\mu g}## (attached below). I get a different answer if I use the impulse-momentum theorem: The total change in...
  39. R

    2 Cylinder elastic rotational collision

    Homework Statement [/B] A cylinder with mass 3kg slides on ice with its base surface at 5m/s and collides with an identical but stationary cylinder. The collision is elastic. After the collision, the center-masses of the cylinders move at angles 45 and 30 degrees from the starting direction...
  40. marsupial

    Calculate the impulse exerted after an inelastic collision

    Homework Statement A block A of mass m traveling with speed v collides head-on with a stationary body B of mass 2m. The two bodies stick together. Calculate the impulse exerted by body B on body A during the collision. Homework Equations ## J = p_{final} - p_{initial} ## ## p_{initial} =...
  41. JayaSuria

    Inelastic Collision - Kinetic Energy

    A 6.0kg metal ball moving at 4.0m/s hits a 6.0kg clay ball at rest and sticks to it. The two move at 2.0m/s. a. calculate the kinetic energy of the metal ball before it hits the clay ball. b. calculate the kinetic energy of the metal ball after it hits the clay ball. c. calculate the kinetic...
  42. C

    Consider a collision: What's m1/m2?

    Homework Statement Consider a collision: If mass 1 has initial velocity 1i-1j of and mass 2 is initially at rest. After collision mass one moves with a velocity of 2i-3j and mass 2 moves with velocity of -1.5i+3j. What's m1/m2? Homework Equations m1/m2-=(v2f-v2i)/(v1i-v2f) The Attempt at a...
  43. P

    Special Relativity- Photon/Mirror Collision

    Homework Statement A photon of frequency ν is reflected without change of frequency from a mirror, with an angle of incidence θ. Calculate the momentum transferred to the mirror. Homework Equations E= hν Conservation of four-momentum The Attempt at a Solution If the mirror is in the x-y...
  44. bebop1

    Kinetic Energy and Collision Question

    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!
  45. bebop1

    Kinetic Energy and Collision Question

    Is there a threshold of maximum kinetic energy lost when kinetic energy is transferred between two objects through collision? I just cannot find any information on this, any help would be VERY much appreciated.
  46. StarWarsNerd

    Generalizing collision normal between two arbitrary shapes

    I am working on a physics engine, and I have a question about the collision normal. There are a lot of different ways people say to calculate this, perpendicular to the collision angle, perpendicular to the edge of body 'B', etc. I was wondering if it would be okay to assume the collision...
  47. KoaDcT

    Solving Elastic Collision: V1' = -2.5 m/s, 5.9 m/s

    Homework Statement The problem is pretty simple, however I don't understand which value to use after using quad formula to solve. See below. V1(initial) = 2.5 m/s V2(Initial) = -5.9 m/s A pool ball moving with a speed of 2.5 m/s makes an elastic head-on collision with an identical ball...
  48. StarWarsNerd

    Angle of Deflection in Elastic Collision

    This is the problem I am looking to solve: given two objects of different mass, find the angle of deflection after an elastic collision for each object. For both objects we know: m : Mass in Kilograms θi : Initial Angle in Degrees si : Initial Speed in Units per Second sf : Final Speed in...
  49. G

    A Two Black Holes' collision thought experiment

    Once, someone had asked two interesting (though absolutely hypothetical) questions: 1) What should happen during the collision of two BHs, one consisting of matter (BH+) and the other consisting of antimatter (BH-)? Should they form a larger BH or should they be annihilated? My personal...
  50. StarWarsNerd

    What is the correct collision formula in this scenario?

    I am working on a simple space game, and I am having trouble figuring out how to do collisions correctly; things bounce in the wrong direction or just get stuck together. Here are the things that are given: Direction of objects A + B in degrees Speed of objects A + B in meters per second Mass...
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