Collision Definition and 1000 Threads

Homework Statement A block with large mass M slides with speed V0 on a frictionless table towards a wall. It collides elastically with a ball with small mass m, which is initially at rest at a distance L from the wall. The ball slides towards the wall, bounces elastically, and then proceeds to...

Homework Statement I just did a lab on inelastic collisions and this was one of the discussion questions: Consider a situation in which you are the driver of a car stopped at a red light and you see a car of similar mass approaching rapidly from behind. Use the results of your experiment...

Homework Statement A 1343 kg car experiences an impulse of 30,000 N during a collision with a wall. If the collision takes 0.43 s, what was the velocity of the car just before the collision? A) 22 m/s B) 9 m/s C) 51 m/s D) 18 m/s Homework Equations F=dp/dt p=mv The Attempt at...

Homework Statement A steel ball of mass m is fastened to a cord of length L and released when the cord is horizontal. At the bottom of the path, the ball strikes a hard plastic block of mass M = 4m at rest on a frictionless surface. The collision is elastic. Find the speed of the block...

Ep = Ek mgh = Ek mgh = ½mv² v = √2gh As the collision is elastic, m1u1 + m2u2 = m1v1 + m2v2. It is known that m2 = 2m1. m√2gh = 2m1v2 v2 = (m√2gh)/2m v2 = (√2gh)/2 Force body diagram of m2: ̂̂̂̂̂̂Fnet = ma Fnet = Fn + Fg + Ff Fnet = Ff m2a = Ff a = Ff/m2 a = Ff/2m1 a =...

Homework Statement In Fig. 9-64, block 2 (mass 1.0 kg) is at rest on a frictionless surface and touch- ing the end of an unstretched spring of spring constant 200 N/m. The other end of the spring is fixed to a wall. Block 1 (mass 2.0 kg), traveling at speed v1 = 4.0 m/s, collides with...

Homework Statement Simple question, if a dog jumps on a stationary sled at velocity v.. the dog weighs 20kg. The velocity after is v/2. What is the weight of the sled Homework Equations m1v = (m1 + m2)v/2 The Attempt at a Solution I rearrange this equation and i get m2 = m1.. this...

Homework Statement Two small bodies initially at rest and free to move from a distance of 1m from each other are subjected to only their gravitational force of attraction. They approach each other and collide and do not separate. In respect to this collision which of the following statement is...

Homework Statement A body of mass 2.0Kg makes an elastic collision with another body at rest and continues to move in the original direction but with one-fourth of its original speed. What is the mass of the other body?Homework Equations Because it is an elastic collision I know that Energy and...

Homework Statement A head on collision between mass and mass B occurs as described in the F vs s graph below. Complete the table in the data section Find \vec{x}A Find \vec{x}B see attached page for clarification Homework Equations P=m*v \DeltaP=F*t Ek=\stackrel{1}{2}mv2 \vec{d} = \vec{v}t...

Collision -- a ball and string form a pendulum... 1. A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a...

Impact and collision -- having problems A smooth sphere A impinges obliquely with an identical smooth sphere B which is at rest. the direction of A before and after impact makes angles 60 and X , respectively, with the line of centres at impact. the coefficient of restitution is e. prove that...

Hello, My textbook says that if two equal masses, with the second one of them at rest initially, collide in an elastic collision. The first mass will stop and the second one will have the initial speed of the first mass. WHY? This makes no sense to me. Elastic collision only means momentum...

Gas from another galaxy is hitting our own, triggering the birth of bright new stars and adding fresh luster to the Milky Way. Link: Scientific American

I have 2 curves and I need to slide 1 of the circles along an axis until it exactly meets the other circle. How do I determine the distance until contact?

Homework Statement A NASA satellite has just observed an asteroid that is on a collision course with the Earth. The asteroid has an estimated mass, based on its size, of 5 × 10^9 kg. It is approaching the Earth on a head-on course with a velocity of 595 m/s relative to the Earth and is now 5.0...

I have a quick question regarding causality in SR and some specific examples. Collision between two bodies is one of the examples when one event causes another, let's say that a body travels towards another which is at rest and hits it. Now my question may seem strange, but what is really the...

Homework Statement Determine the fractional decrease in total kinetic energy of each set of asteroids when they collide. If the average specific heat of the material composing the asteroids is assumed to be that of ice (2.05 kJ/kg·˚C), by how much does the temperature of the asteroids rise...

Two masses m_1 and m_2 are closing each other with speeds v_1 and v_2 . The coefficient of restitution is e. Calculate the amount of kinetic energy loss after caused by the collision. I solved it in the center of mass coordinates( v_{cm}=u_{cm}=0 ). The relative speed before and after the...

Hello. I'm a writer going back and doing some fact checking to make an important scene more believable. It involves a character, Lux in the backseat of a jeep which has just suffered a head on collision with a bus. But I think I am doing something wrong because the numbers I get don't seem to...

Homework Statement Consider a photon colliding with an electron and scattered directly backward. If the electron is initially at rest and the incident photon has frequency f, determine the frequency of the back-scattered photon Homework Equations The Attempt at a Solution Since the...

1. A steel ball of mass 0.400 kg is fastened to a cord 60.0 cm long and fixed at the far end, and is released when the cord is horizontal. At the bottom of its path, the ball strikes a 2.00 kg steel block initially at rest on a frictionless surface. The collision is elastic. Assuming the...

N2 + 3H2 -----> 2NH3, For this reaction to occur does one nitrogen have to collide with 3 hydrogen molecules, or should 3 nitrogen molecules collide with 3 hydrogen molecules to break up the bonds? I just brought up this example because of it's stoichiometry not for any other reason. Thanks in...

Hi, I am wondering if total momentum of the system is conserved in this case. Our system is consisted of two balls: one is falling vertically down to ground, another is thrown vertically up, so they collide in air. Is total momentum of the two balls conserved after the collision? Now I...

Homework Statement You are just starting a new job as investigator for the car collision investigation. You assist your superior in order to determine, as accurately as possible, the circumstances surrounding collisions (initial velocity of the vehicles involved, direction vehicles were...

Football Player 1 (mass m1 = 72 kg) has just caught a pass at the 50 yard line when he is tackled by Football Player 2 (of mass m2). Each player was initially moving at an angle of theta with respect to the 50 yard line at 8.0m/s. the tackle is a perfectly inelastic collision and the players...

Homework Statement A 0.50 kg ball with a speed of 1.5 m/s in the positive direction has a head-on elastic collision with a stationary 0.80 kg ball. What are the velocities of the balls after the collision? Homework Equations I've used the Ek = (1/2)m(v^2) so far. The Attempt at a...

What happens when a gas molecule collides with a liquid molecule at the microscopic level ?

Homework Statement A homogenous, thin stick with the mass m and the length l is hanging from the ceiling and can rotate freely around the point P. A small ball with the mass of M is attached to the end of the stick. The small ball on the end of the stick gets hit by another small ball with...

Homework Statement A particle with speed v1 = 2.64 × 10^6 m/s makes a glancing elastic collision with another particle that is at rest. Both particles have the same mass. After the collision, the struck particle moves off at 45º to v1. The speed of the struck particle after the collision is...

Homework Statement A ball is attached to one end of a rod. A second ball hits the ball with velocity u. The collision is inelastic and both balls after the collision travel together with a new velocity v. The rod is attached to the ceiling at a point with no friction. The moment of inertia...

Homework Statement Hi, could someone help me with some physics homework for a head on collision between a truck and a car. Truck and car are going the same speed (50mph) but truck weighs 5 times more than car. Q.1. What is the force on each car? Q.2. What is the impulse? Q.3. Explain in...

We have 2 masses: one with mass \(M\) with velocity \(V_0\) and the other with mass \(m\) and velocity \(0\). \begin{align} MV_0 &= MV_0' + mv'\\ M(V_0 - V_0') &= mv'\qquad (*)\\ MV_0^2 &= MV_0^{'2} + mv^{'2}\\ M(V_0 - V_0')(V_0 + V_0') &= mv^{'2}\qquad (**) \end{align} So let's take...

What is the physics explanation of why, when you play pool, and one ball slams into another ball, does the ball originally in motion become stationary and the other ball takes on all the velocity?

Homework Statement 1200kg car moving at 9.72m/s runs into and sticks to a parked 1000kg car. The collision takes 0.15s and after the crash the cars wheels lock and they skid to a stop on u=0.40 road. What is the impact force on both cars? Homework Equations J=F*t=m*dv The Attempt at a...

Homework Statement A stick of mass m and length l is pivoted at one end. It is held horizontal and then released. It swings down, and when it is vertical the free end elastically collides. Assume that the ball is initially held at rest and then released a split second before the stick strikes...

In kinetic theory a liquid is viewed as an incompressible substance in which the atoms are free to move. I would like to know how to find an expression for the molecular flux in a liquid. By molecular flux I mean the collisions per unit area, where collision refers not to the collision between...

Homework Statement Consider a bar of length L, mass M, and uniform density floating in free space (ie: neglect gravity and assume that it is not contacting anything). The bar is initially stationary. Imagine a bullet of mass m traveling at a speed v hits the bar at one end. What is the...

I was wondering what happens when sub-atomic particles collide together. Could the energy created from this event cause other sub-atomic particles to be drawn in? If so would there be a second explosion from too much mass collecting in one small space?

Homework Statement A uniform square plate of mass m and side a can freely rotate about a vertical axis passing through one edge. It is initially at rest. A particle of mass m is moving horizontally and perpendicular to the plane of the plate with velocity u. The particle collides with the...

Homework Statement In deep space a 7.0 kg rubber ball moving along the x-axis with a speed of 20 m/s collides ELASTICALLY with another ball of mass = 25 kg. After the collision the 7.0kg rubber ball's velocity is directed in the positive y axis. Find the final speed of the 7 kg ball, as well...

I have a 3DOF gryo with massless bearings and gimbals that is enclosed in case or cylinder. The cylinder will limit the range of motion of the gyro. Please see the pictures. I am trying calculate rotor velocities in pitch and yaw after a collision with the cylinder wall. The...

physics question?? proton/antiproton collision find velocity Homework Statement A proton and antiproton collide with equal and opposite momentum at the SPS collider in Geneva to form a single massive particle which is 10 times more massive than a proton. What is the velocity (as a fraction of...

Hi all, I am trying to understand about collision frequency that happened in ionosphere layer. In D region, below 90 km [Wait and Spies 1964] the ionospheric electron-neutral collision frequency given as v(h) = 1.816x10e11 exp(-0.15h) I just wondering, to who ever really expert in...

I have a question; If two particles (let's say protons) collide at high speed, they can produce heavy particles, like the Higgs. My understanding is that the high velocities make the particles more massive, allowing them to produce higher mass particles (relativity). So... If I fly past...

My class was given a packet with several scenario questions. I've got the rest of them completed and this is the only one remaining. So I know that the question involves: Momentum Conservation (2-D): Inelastic collisions, Work-energy: Conservation of energy with friction, Dynamics: Newton's...

Suvat equations -- car braking hard to avoid a collision Homework Statement A car (A) is speeding along a rural road, of width 4m with a speed of 25m/s when the driver sees another vehicle (B) of length 3.5m just starting to cross the road at a point 40m ahead. The drivers reaction time is...

Homework Statement You throw a baseball at a 45 degrees angle to the horizontal, aiming at a friend who's sitting in a tree a distance, h, above ground. At the instant you throw your ball, your friend drops another ball. a) Show that the two balls will collide, no matter what your ball's...

In an inelastic collision of a moving billiard ball with a second ball at rest, I understand that the two balls have the same velocity after contact, correct? But at the instant of contact how do the velocites of the two balls change instantaneously? Doesn’t that imply an infinite force...

Homework Statement A person driving a car suddenly sees a wall .At that instant velocity of the car is v. Coefficient of static and kinetic friction is μ. The mass of the car is M. To avoid the driver should ...(acc. due to gravity=g) a)apply breaks b)turn (the car shouldn't slip while...