Questions tagged [collision]

This tag is for questions relating to collision which is the interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved. When it happens, kinetic energy is often exchanged between the molecules’ translational motion and their internal degrees of freedom.

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Collision of $\rm H$ atoms [closed]

The question is: Two $\rm H$ atoms in the ground state collide inelastically. The maximum amount by which their combined kinetic energy is reduced by__________ well in this question I solved it ...
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2 votes
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Physics of tennis hit

If one takes notice the tennis players hit the ball on the right corner that way: Their last step before the hit is on the right foot, then they hit and then their left foot goes up in the air about ...
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Earth colliding into planet-sized object faster than speed of light [duplicate]

Imagine the following scenario: Earth is travelling in one direction at just over half the speed of light Another planet-sized object is traveling in the opposite direction towards Earth, also at ...
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Energy conservation in elastic collisions and pendulum [closed]

This is my solution but I couldn’t find $h$ in term of $V \rightarrow M_{1} V - M_{2} V = M_{2} V_{2} \implies V \left( M_{1} - M_{2} \right) = M_{2} V_{2} \implies \frac{M_{1}}{M_{2}} = 1 + \frac{V_{...
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Angle-free two-dimensional inelastic collision formula?

I'm trying to calculate velocities (by components - x, y) of two objects (balls) after inelastic, two-dimensional collision. I've successfully implemented the angle-free formula for elastic two-...
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Comparing the impact of crash between two objects: Free Fall vs Wind Mill

Object A falls down to the ground directly without any other variable affecting it, which is free fall. Object B falls down to the ground as the same trajectory with object A, while spinning around ...
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Energy Dissipated in Perfectly Inelastic Collision

I was recently going over an AP physics C exam question, and I don't really buy their solution for one of the problems. The specific problem is Mech 1. part e of this test, and the solutions are ...
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Do you have to leave something behind to go forward? (ie a contained system)

By "behind" I mean a particle outside of the box. ( assume a 1d system)Imagine a closed box. And at the very center of that box, is a device that fires particles 1,2 in opposite direction. ...
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Satellite Collision with other objects

I am looking for a detailed physical study on the collision of satellites with other objects while moving in their orbit
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What would happen if when falling down you get pushed up?

I know it will be a weird question, but im not a physics well informed person and I had this unsolved question for long time. What would happen if lets say you are falling with someone else from ...
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Relation between Work-Energy Theorem and Collisions [closed]

I am stuck on this idea relating the Work-Energy theorem and collisions. The derivation for the Work-Energy theorem is entirely mathematical, and simply involves Net work on a system = $$W_{net} = \...
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What is the specific heat of plasticine?

Does anyone know what is the specific heat of plasticine? I tried a lot to find it in google, but I couldn't. I need it for making a problem in physics (inelastic collisions). I could use clay instead ...
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Finding How to Transform a Plane to Reflect a Trajectory through a Given Coordinate

So, for context, I am trying to analyze how this basketball machine works: https://www.youtube.com/watch?v=FycDx69px8U I have a basic understanding of how to calculate the new velocity of the ball ...
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Latest textbooks on computational thermal analysis

I want to simulate the heat caused by planetary collision and I want a textbook about computational thermal analysis that explain the heat simulation
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Calculating the rest mass after relativistic collision [closed]

Suppose we got two particles, both of mass $m$ for simplicity, travelling at high speeds towards each other, meaning we have to take into consideration of relativistic effects. We also know that the ...
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Puzzle with the precession of the neutron spin?

More perplexing news about the neutron spin in this recent Nature Physics publication: arxiv.org/abs/2103.03333 The authors collaboration (more than 100 authors) report a newly experimentally found ...
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How does the shape of an object affect the coefficient of restitution?

I can understand how elasticity of an object plays a role in determining the coefficient of restitution, but various sources say that the shape of the object is important as well (and in particular I ...
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3 answers
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What's wrong with this equation (Newton's Third Law & Energy Conservative Principle) [closed]

In an elastic collision, the energy is conserved. So $$ KE_{1} = KE_{2} \\ \frac{1}{2}m_1\vec u_1^2 + \frac{1}{2}m_2\vec u_2^2 = \frac{1}{2}m_1\vec v_1^2 + \frac{1}{2}m_2\vec v_2^2 \\ -m_2 (\vec v_2^2 ...
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Pendulum ball hitting a ball at an angle

I conducted an experiment and I am using a pendulum to swing a ball from theta back from a line perpendicular to the horizontal see figure 1. Figure 1 the mass not attached to the pendulum will be ...
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Damage Equations for Projectiles with Small Velocities

I'm working on a personal project that happens to involve projectiles impacting an aluminum surfaces. The projectile velocities I am dealing with are relatively small compared with meteoroid ...
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How does the concept of activation energy work for interatomic collisions?

Say we have a Lennard-Jones -esque potential for colliding atoms. Say this potential admits a bound state at a lower energy than the kinetic energy of the colliding atoms. So forming this molecule ...
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How to Calculate speed of body required for collision to have specific output

I'm trying to calculate the speed the bolt of an airsoft rifle has to go in order for a bb to have a specific speed. for example: the bb weighs 0.2g and the bolt I have weights 100g, I would like the ...
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1 vote
2 answers
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Elastic Collision: question on Wiki equation

I'm confused over the Wiki equation for an elastic collision. Does anyone know how equations (1) and (2) are formed to result in (3)? I think I'm overlooking some simple algebra. Consider particles ...
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Trampoline physics: Why do rectangular trampolines provide more "bounce"

The guys over at reddit.com/r/trampoline say that a rectangular trampoline has a larger sweet spot AND provides more air. Typical dimensions are 9x15 10x16 to 10x18 I can see the following cases: ...
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Finding how much a larger body slows down when it collides with a number of much smaller bodies

A larger spherical body collides with a number of much smaller spherical bodies. I've just seen this equation, and was wondering if anybody could explain it to me: $$\Delta v =1-\frac{1}{1+\pi R^2n\...
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Are collisions ignored while calculating fluid pressure?

Consider a container of height $h$ filled completely with fluid of density $\rho$, Assume pressure at top is zero therefore pressure at the bottommost points will be $p_b=\rho gh$ and therefore force ...
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2 answers
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Question on conservation of momentum

Consider the head-on collision between a lady bug and the windshield of a high speed bus. Which of the following statements are true? List all that apply. (a) The magnitude of the force encountered ...
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Pendulum collision problem [closed]

2 steel balls are hung on threads in a way that they are touching each other and their centers of gravity are $l = 1 ,5 \ \mathrm{meters}$ below the hang points, threads are vertical. Masses of the ...
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Conservation of momentum and explosions

I am working on a problem involving a projectile launched at an angle from the ground at some initial velocity and then explodes into 3 parts after reaching its maximum height and they want us to find ...
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Can objects move during a collision-elastic collisions?

Can two objects move together during an elastic collision before moving apart? Or would this be considered an inelastic collision since during the time in which the objects were stuck moving together, ...
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1 vote
1 answer
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How to find the velocity of 2 objects after an explosion? [closed]

I am learning Momentum collisions at the moment and stuck on a problem I don't know how to solve. There is an object that moves on 1 dimension (y axis) and at some point explodes and split into 2 ...
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Conservation of momentum + conservation of energy + Newton's second law = Contradiction?

When a body with a mass of 1 kg moves at constant velocity of 1 m/s and collide (elastic collision) with a body with the same mass that's at rest, we know from conservation of momentum and ...
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Question about collisions at close-to-light speeds

Strange question here. If you would, assume a game of marbles on a planetary scale, one player throws a marble very close to the speed of light travelling along a direction x, another throws a marble ...
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2 votes
1 answer
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Angular velocity after collision of two curling stones

I am trying to create physics for game. I think I can figure out how the stones should move after collision... however I am not sure how to figure out the angular velocity of stones after collision. ...
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3 votes
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Can two passing black holes touch without merging? [duplicate]

I've read a report about LIGO saying that the ring-down oscillation showed that it took time for the pair of BHs to fully merge, implying there was a momentary bulge as one circled around and into the ...
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Incident Angle of Impactor Against Ellipticity of Crater

Recent empirical results that I have produced by dropping balls into sand indicate that the ellipticity of a crater- i.e. the ratio of major axis diameter to minor axis diameter - varies linearly with ...
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Intuition for Impact Crater Diameter Relationship with Impactor Mass

Recent experiments that I have been carrying out dropping balls into sand suggest a relationship between impact crater diameter and impactor mass of: D = kM^0.31 where M is mass, k constant, and D is ...
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If two objects collide and one is initially at rest, is it possible for both to be at rest after the collision?

I know that the straight answer to my question is no. Since the initial momentum is not zero, the final momentum is not zero. What about when object A impacts object B that is rigidly fixed to earth ...
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6 answers
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Apparent kinetic energy paradox

Imagine two cars (A and B) of mass $m$ that want to destroy themselves by colliding. They need a velocity of magnitude $2v$ with respect to each other to achieve the destruction that they want and ...
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Shockwaves in a colllision of two cylinders

On Motion Mountain's first volume (fall, flow and heat) by Christoph Schiller, page 128, the author asks the following puzzle: A surprising effect is used in home tools such as hammer drills. We ...
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7 answers
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Why do elastic balls bounce?

Can someone please explain the process of a ball bouncing in terms of Forces? First, it doesn't make sense to say that the normal force is greater than that of the upwards force. When the ball hits ...
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Mass + velocity to pressure. How to measure pickleball flex without hurling it?

I want to know how much a pickleball (it's like a whiffleball) compresses when it hits the floor. I can't afford a 500,000 fps camera, so maybe an approach using basic principles would work. I also ...
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3 answers
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When a ball is dropped on a floor is that harmonic motion?

From Simple Harmonic Motion, we conclude that acceleration is proportional to its distance and the sign is negative. We also know that at equilibrium position $dU/dx=0$. Now, if we think a ball is ...
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Effect of adhesive on ballistic fabrics

Adhesive is applied to "soft" ballistic fabrics (like kevlar or even fiberglass) in order to decrease bulge when being hit by a projectile. What would be the effect of gluing layers of ...
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1 vote
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Final velocity and length of a projectile impacting and passing through a target slab?

I want to know the approximate final velocity $v_f$ and length $L_f$ of a projectile that impacts and passes through a slab of given thickness $D$. This is my attempt to solve the problem so far. I ...
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2 votes
5 answers
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Elastic collision of two identical hard spheres [closed]

Hello, I want to find the relation between impact parameter b (it is negative on the figure) and the scattering angle $\theta$ which is $\theta_1$ on the picture. The collision is elastic, and the ...
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Resulting momenta of two balls after inelastic collision

Suppose two aligned equal balls, or spheres (same dimension, mass, energy, linear momentum, etc.) having an inelastic collision along the x-axis, with no background friction. Each sphere can have ...
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13 votes
14 answers
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If force depends only on mass and acceleration, how come faster objects deal more damage?

As we know from Newton's law, we have that $\mathbf{F} = m\cdot\mathbf{a}$. This means that as long as the mass stays constant, force depends solely on acceleration. But how does this agree with what ...
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I need to calculate the direction for mid air collision

I have two objects in 3D world without gravity, let's say two spaceships A and B and Ship B need to catch to ship A. Both ships have initial velocities different from each other. Ship B got thrusters ...
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Is it possible to find Coefficient of Restitution without performing experiment? But only using mathematical equations?

I was finding empirical equations to find Coefficient of Restitution (COR) for two solid bodies undergoing collision. Seems like all have used experimentation to find COR. Is there any way to find ...
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