Questions tagged [collision]

Interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved.

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Can someone explain what is the force the ball will exert?

If a ball is falling under free fall then the force exerted by the ball on the ground would be $mg$. But that's not the case in real life ball would hit with more force. But when i draw free body ...
31 views

Do individual rest masses change in a relativistic elastic collision?

Consider a classical isolated relativistic elastic collision of two free scalar point masses in 1 D. The aim is to get the final velocities of the particles given initial rest masses and initial ...
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Radiation from collision of two charged particles

Consider a collision between two electrons. Since each particle is accelerated during the collision, I assume each radiates energy according to the Larmor formula. Question 1: How much energy is ...
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From the frame of reference of a colliding object, does the entire universe change direction when it bounces?

Consider three objects: a rubber ball, a spaceship, and an isolated brick wall floating serenely in the vacuum of space. From the perspective of an observer on the spaceship, the ball is moving ...
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A ball of mass $m$ is dropped from a height $h$ on to a rigid floor. If $e$ is the coefficient of restitution [on hold]

A ball of mass 'm' is dropped from a height 'h' on to a rigid floor. If e is the coefficient of restitution, the time required for the complete bounce is? After finding the initial and final velocity ...
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Theoretically, Is it possible to create a nova by firing large masses into a sun?

In a science fiction story (Bobiverse) a nova is created by accelerating two small planets at relativistic speeds into a sun from opposite sides.The shockwave creates hydrogen fusion on opposite sides ...
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Will a man falling from a great height and a man lying on ground exert same amount of force on the earth?

Suppose in a situation there is a man falling from a height, when he falls from a height and touches the ground then he applies some force on the ground which is equal to his weight, and in another ...
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Is the coefficient of restitution always equal to the square root of the ratio of final kinetic energy to the initial kinetic energy?

The coefficient of restitution (COR) according to some sources (https://en.wikipedia.org/wiki/Coefficient_of_restitution) is equal to the square root of the ratio of final kinetic energy to the ...
53 views

Why is the momentum always conserved in elastic collision?

As the title above, why is the momentum always conserved in elastic collision (no loss of kinetic energy)? Does it related to the conservation of kinetic energy? If so, how do we prove that? Further ...
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How do we calculate the force applied by a ball on a wall which bounces back? [on hold]

If we have a ball which we throw toward a wall which touches the wall and bounces back then how will you calculate the force applied by the wall on the ball because the the contact time of the ball ...
109 views

Newton's Third Law of Motion? [duplicate]

Newton's third law of motion states that every action has an equal and opposite reaction. But, on punching a wall, I feel much greater force than on punching an inflated balloon. So, what does it mean?...
54 views

Kinematics: One dimensional motion

If a particle is moving in one dimension with constant speed, can we say acceleration is zero at all the points? Answer given in my textbook is yes acceleration is zero. But I think it can undergo a ...
523 views

What would Happen if a Primordial Black Hole, with 5-10x time the mass of Earth, were to fall into our Sun?

So lately i heard of this theory that planet 9 might be a Primordial Black Hole (PBH) with 5 - 10 times the mass of Earth. I was thinking to myself, what would happen, if such a PBH (if it even exists)...
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Why does body with continuous speed generate force?

So... sorry if the question seems a bit stupid, but it's been nagging me all day and I couldn't find an answer on the net. It goes like this: If a body, say, a car is moving with constant speed. This ...
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Collisions in a System of Bodies

There are three blocks A,B and C, with B and C at rest connected by a light spring and A moving with a velocity v, all three lying on the same horizontal frictionless surface. After some time A ...
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Why is tangential particle momentum conserved in a collision?

In my dynamics class, we learned that the individual momenta of two colliding particles is conserved in the direction tangential to the collision. Why would this be the case? Consider the diagram ...
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Work of a fixed wall

In this link here, What work is done by the wall when a ball hits it? The answer to the question if a wall performs work when hit by a ball was, that the wall does no work if it isn't displaced. But ...
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Reaction Force or Normal Force? [duplicate]

When we punch a wall our hand hurts... Do we feel the pain due to the normal force exerted by the wall or due to the reaction force?
80 views

Where is the momentum going?

When a ball of mass $m$ collides elastically having velocity $v$ with a wall, then it retraces itself with the same velocity. Impulse on the ball due to wall is $2mv$ and since there is no external ...
34 views