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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Conservation of linear vs. angular momentum in two similar cases
I have a question that eludes my understanding:
Imagine we have a bullet of mass $m$ and a rigid pendulum with a bob of mass $M$ hanging from a rigid rod of negligible mass hanging from the ceiling ...
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Kinetic Energy change in particle to wall collision [closed]
The Question
A particle of mass m is moving in the +x direction with a speed v. It is
approaching a massive wall which is also moving in the +x direction, but
with a speed u < v (see figure)
The ...
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What's the best answer to "how many bounces until the ball stops"?
A problem question that has been coming has the form:
How many complete trips between two plates moving towards each other can you make? (Given that you are moving between them at a constant velocity,...
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The total horizontal distance traveled by a bouncing ball nudged off a table of height $H$ [closed]
Suppose a ball gently rolls off a flat surface of height $H$ and free falls to the ground subject only to the law of gravity. Once the ball hits the ground, it rebounds as shown in the figure. When ...
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Angular momentum conservation in collisions about point of impact
We use the idea that if a body collides with something, its angular momentum is conserved concerning the point of impact. Source
It is clear to me that all impulsive forces and the colliding bodies' ...
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How to estimate the impact force of a martial artist breaking bricks?
I was watching a martial artist breaking a stack of 9 out of 10 concrete bricks. I noticed that the last didn't break. It made me wonder if this would allow calculating the force dealt to be ...
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Physics of Auto Crashes and Airbag Modules
I recently saw a post (that was pretty old) asking why we don't consider the jerk function more often in sciences that deal with impacts or sudden accelerations. The general belief was that impacts, ...
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Impulse of two different objects
I was running over a question,
A collision occurs between particles A and B which are moving in opposite directions in the same straight line. The impulse on each particle in the collision is 2N.s, ...
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Acting forces on a curve ball (billiards)
I am trying to understand how the physics behind a curve ball in billiards work. Please see the attached picture:
The red ball is meant to hit the blue ball. But to reach the blue ball, it has to go ...
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What happens to a softer material hitting a harder material at high speeds?
You often see action scenes in media, where a person is thrown so hard against a concrete wall, it breaks.
My question is if it's possible for a softer material to be accelerated to point where it ...
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Idealized Newton's cradle
I was wondering about the conditions for an ideal newtons cradle.
Under regular circumstances, the collisions are inelastic and a newton's cradle dissipates energy in various forms like heat, friction,...
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Classical Explanation for Electron-Ion collisions
Classically, electrons collide with other electrons and massive (by comparison), stationary positive ions as they conduct down a wire when an electric field is applied. Is there a good mechanism ...
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Direction of impulse
My textbook has the following problem:
A batsman deflects a ball by an angle of 45° without changing the initial speed which is equal to 54 km/h. What is the impulse imparted to the ball? (Mass of ...
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How do I derive the formula of coefficient of restitution?
I have learnt in collision mechanics about the term "coefficient of restitution":
$$e=\frac{v_{2,\text{f}}-v_{1,\text{f}}}{v_{1,\text{i}}-v_{2,\text{i}}}.$$
But the sad part is that my book ...
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For an objective falling, reaching terminal velocity and then hitting the ground, how can I find the force it exerts on the ground? [closed]
For example object with v=tanh(0.1213)t/0.01236. m=69kg.
I thought I had to use F=mv/t but that just gives the net force of the object while falling.
I don't know how to find the force impacting on ...
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