Dannie Briseno: the priority is the earth is so large, what you're calling "angular momentum" is extremely left out and linear momentum is rather used as a results of the indisputable fact that's a lot extra effective and obvious. The linear momentum of a automobile comes from the automobile shifting. It has no momentum even as that is table certain. I also do not extremely get what you attempt to assert even as someone jumping adverse to a wall is gaining linear momentum.
Joie Libutti: Suppose F is the net force on a system of particles, m is the total mass of the particles, and a is the acceleration of the center of mass of the system. Newton's 2nd law givesF = maF may be split up into the external forces acting on the system and the internal forces between particles in the system.F_ext + F_int = maSuppose we have a closed system so that F_ext = 0.F_int = maNow, Newton's 3rd law causes the internal forces to cancel in pairs so that F_int = 0.0 = maIt can be shown ! thatma = m1 a1 + m2 a2 + m3 a3 +...Where each term is the rate of change of the momentum of the ith particle. Thus, if p is the net momentum of the closed system of particles,0 = (d/dt) pOr alternately,p is conserved, orp_initial = p_finalThere are many situations in which energy is not conserved due to the presence of dissipative forces. Even in these situations, momentum is still conserved. Because of this, momentum conservation is very useful for solving problems involving inelastic collisions....Show more
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