Originally posted by joe shmoNo, conservation of momentum shows itself in the recoil of the firearm.
It does, when a bullet is fired every thing else in the system moves. Fire a bullet to the right, the universe moves to the left. Its consevation of momentum.
Anyway, momentum and energy are two different things.
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Originally posted by AThousandYoungWhich in turn,imparts momentum on the person, who imparts momentum on the earth, which changes the momentum of the solar system,galaxy,ect..........Im not wrong.
No, conservation of momentum shows itself in the recoil of the firearm.
Anyway, momentum and energy are two different things.
Originally posted by joe shmoThats quite correct Joe, I had never considered that the firing of the gun would impart a force (albeit miniscule) on the sun but as you point out it does!
Which in turn,imparts momentum on the person, who imparts momentum on the earth, which changes the momentum of the solar system,galaxy,ect..........Im not wrong.
We always consider Conservation of Momentum within a 'system' but that 'system' (thanks to gravity) is the Universe.
Or is it? Is there a minimum force (ie a quanta of force)???????????
Originally posted by wolfgang59Now this I no almost nothing about, But what about weak nuclear force is that a quanta of force,or is this actually a strong force in comparison to what we are talking about?
Thats quite correct Joe, I had never considered that the firing of the gun would impart a force (albeit miniscule) on the sun but as you point out it does!
We always consider Conservation of Momentum within a 'system' but that 'system' (thanks to gravity) is the Universe.
Or is it? Is there a minimum force (ie a quanta of force)???????????
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Originally posted by AThousandYoungThey arent the same, but the are both conservation laws and they are related
Momentum and energy are not the same thing guys...I was talking about energy.
Ke = 1/2*m*v^2 (Kinetic Energy)
dKe/dv = m*v ( momentum, the rate of change of Kinetic energy with respect to velocity)
dKe/dt = m*v*dv/dt = m*v*a = P (Power, the rate of change in Kinetic energy with respect to time)
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Originally posted by joe shmoIs there any difference between a Kg of aluminum going 100 Km/hr V a kg of Uranium going 100 Km/hr? It would seem at least the uranium would have more penetrating power as in its use in military ordinance. Is that all there is to it, the mass alone? What about for instance, a billiards ball of standard material V one made of say standard on the outside but lead on the inside, I guess that would be biased because you couldn't make them the same size unless there was a hollow in the lead ball. So what about that, a specialized billiard ball with ordinary stuff on the outer few millimeters and a lead foam inside so they weigh the same, any difference in the kinetics?
They arent the same, but the are both conservation laws and they are related
Ke = 1/2*m*v^2 (Kinetic Energy)
dKe/dv = m*v ( momentum, the rate of change of Kinetic energy with respect to velocity)
dKe/dt = m*v*dv/dt = m*v*a = P (Power, the rate of change in Kinetic energy with respect to time)
So I googled 'Momentum Vs Kinetic energy' and found this great link with nice thought experiments to explain the difference:
http://www.batesville.k12.in.us/physics/phynet/mechanics/Energy/KENOTMomentum.html
Originally posted by sonhouseCoefficient of Restitution? (which is probably related to density?)
Is there any difference between a Kg of aluminum going 100 Km/hr V a kg of Uranium going 100 Km/hr? It would seem at least the uranium would have more penetrating power as in its use in military ordinance. Is that all there is to it, the mass alone? What about for instance, a billiards ball of standard material V one made of say standard on the outside but ...[text shortened]... erence:
http://www.batesville.k12.in.us/physics/phynet/mechanics/Energy/KENOTMomentum.html
Originally posted by sonhouseThey'd have the same energy but the aluminum projectile would be bigger. This means more air resistance, vulnerability to wind, and probably a greater cross section spreading the force over a larger area of armor.
Is there any difference between a Kg of aluminum going 100 Km/hr V a kg of Uranium going 100 Km/hr? It would seem at least the uranium would have more penetrating power as in its use in military ordinance. Is that all there is to it, the mass alone? What about for instance, a billiards ball of standard material V one made of say standard on the outside but ...[text shortened]... erence:
http://www.batesville.k12.in.us/physics/phynet/mechanics/Energy/KENOTMomentum.html
You're referring to density.
So what about that, a specialized billiard ball with ordinary stuff on the outer few millimeters and a lead foam inside so they weigh the same, any difference in the kinetics?
Possibly. It would depend on weight distribution inside the ball and hardness of the ball. Also there's the possibility of deformation; this might be part of "hardness". If those were also the same it should act the same.