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pdpax
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Hi everybody,
Any one can tell me why the momentum of the wall is 2mv while a ball collides it?
Any one can tell me why the momentum of the wall is 2mv while a ball collides it?
I'm not sure what you mean by 'why', but it's a consequence of momentum conservation. If a ball with momentum +mv collides elastically with a fixed wall and thus rebounds with momentum -mv, the wall (and all attached to it) must end up with an total momentum of +2mv.pdpax said:Any one can tell me why the momentum of the wall is 2mv while a ball collides it?
Are you suggesting that momentum is not conserved during the collision?Sakriya said:wall is not moving.. a stationary body does not posses momentum.
When the ball strikes with +p momentum the wall gives out equal and opposite reaction of -p momentum.
Are you suggesting that momentum is not conserved during the collision?
I think you are a little confused here. The velocity of the ball after striking the wall IS different! (Speed is the same, but velocity is a vector quantity so a change in direction is a change in velocity)Sakriya said:Of course it is conserved.
When ball hits the wall, the wall does not move because it is held at bottom and due to rigidity and elasticity of the material. The wall gives this back to the ball as reaction due to the action. That's why the velocity is same as it was when the ball was striking it. The wall doesn't have it's own momentum which it is imparted to the ball(it seems you suggested that), if so was true then velocity of the ball after striking would be different. That's what conservation of momentum is... final momentum equals initial
Sakriya said:the wall does not move
wall is not moving.. a stationary body does not posses momentum.
When the ball strikes with +p momentum the wall gives out equal and opposite reaction of -p momentum.
The momentum of wall refers to the amount of motion or movement a wall possesses. The "2mv" component represents the mass (m) of the wall multiplied by its velocity (v), which together determine the wall's momentum.
Understanding the momentum of a wall is important for engineers and architects when designing buildings and structures. It helps them determine the amount of force and impact a wall can withstand, and how to properly support and reinforce it.
The momentum of a wall is calculated by multiplying the mass of the wall by its velocity. The formula for momentum is P = mv, where P is momentum, m is mass, and v is velocity. The resulting unit for momentum is kilogram-meters per second (kg·m/s).
Yes, the momentum of a wall is directly proportional to its mass. This means that a larger wall with more mass will have a greater momentum than a smaller wall with less mass, as long as they have the same velocity.
In real-life scenarios, the momentum of a wall is important to consider in situations where the wall may experience a force or impact, such as during natural disasters or collisions with other objects. The momentum of the wall can help determine the potential damage or impact it may have on its surroundings.