the product of mass and velocity is called moment of inertia.
the product of mass and velocity is called moment of inertia.
the product of mass and velocity is called?
moment of inertia
a change in momentum of a mass requires a force; according to newton's first law, known as the law of inertia, inertia simply being another term for mass. that force, applied to a mass, creates an acceleration, which when applied over time, changes the velocity of a mass. according to newton's second law, the law of momentum -- changing the velocity of the mass changes its momentum, (mass multiplied by velocity). it is important to understand at this point that velocity is not simply speed. velocity is the speed of a mass in a particular direction. in a very technical sense, speed is a scalar (mathematics), a magnitude, and velocity is a vector (physics), magnitude and direction. newton's third law, known as conservation of momentum, recognizes that changes in the motion of a mass, brought about by the application of forces and accelerations, does not occur in isolation; that is, other bodies of mass are found to be involved in directing those forces and accelerations. furthermore, if all the masses and velocities involved are accounted for, the vector sum, magnitude and direction, of the momentum of all the bodies involved does not change; hence, momentum of the system is conserved. this conservation of momentum is why gun recoil occurs in the opposite direction of bullet projection -- the mass times velocity of the projectile in the positive direction equals the mass times velocity of the gun in the negative direction. in summation, the total momentum of the system equals zero, surprisingly just as it did before the trigger was pulled. from a practical engineering perspective, therefore, through the mathematical application of conservation of momentum, it is possible to calculate a first approximation of a gun’s recoil momentum and kinetic energy, and properly design recoil buffering systems to safely dissipate that momentum and energy, simply based on estimates of the projectile speed (and mass) coming out the barrel. to confirm analytical calculations and estimates, once a prototype gun is manufactured, the projectile and gun recoil energy and momentum can be directly measured using a ballistic pendulum and ballistic chronograph.
recoil
bullet::::- kinetic energy: ke = 1/2"mv" (where "m" is mass and "v" is velocity). this helps to explain why wounds produced by projectiles of higher mass and/or higher velocity produce greater tissue disruption than projectiles of lower mass and velocity. the velocity of the bullet is a more important determinant of tissue injury. although both mass and velocity contribute to the overall energy of the projectile, the energy is proportional to the mass while proportional to the "square" of its velocity. as a result, for a constant velocity, if the mass is doubled, the energy is doubled; however, if the velocity of the bullet is doubled, the energy increases four times. the initial velocity of a bullet is largely dependent on the firearm. the us military commonly uses 5.56-mm bullets, which have a relatively low mass as compared with other bullets; however, the speed of these bullets is relatively fast. as a result, they produce a larger amount of kinetic energy, which is transmitted to the tissues of the target. the size of the temporary cavity is approximately proportional to the kinetic energy of the bullet and depends on the resistance of the tissue to stress. muzzle energy, which is based on muzzle velocity, is often used for sake of ease of comparison.
gunshot wound