26 Mar '09 02:52>1 edit
So my instructor holds a bowling ball up to his face , the ball attached to the cieling by a chain, lets it go ...then points out that if momentum is a conserved quantity "where does it go if at the extreems of its motion its momentum is 0"
I would say it goes into changing the PEg ( gravitational potential energy)
i would like to look at this mathematically
So i state that
Change in KE= Change in PEg
1/2*m*V^2 = m*g*h
Now in order to relate momentum to this I'll take the derivative of both sides with respect to velocity
m*V = d ( m*g*h)/dV
so in words, momentum (in this instance) is the rate of change of potential energy with respect to velocity...
now its the " with respect to velocity" that Im having trouble grasping as a physical concept
Im thinking that this means that the only way its potential energy can change is if it experiences a change in velocity ( or vice versa) This seems logical to me, but I'm not quite sure if that is in fact how that quantity could be described and or will my instructor buy it..
perhaps it doesnt show anythig at all, I dont know
any thoughts appriciated
Eric
I would say it goes into changing the PEg ( gravitational potential energy)
i would like to look at this mathematically
So i state that
Change in KE= Change in PEg
1/2*m*V^2 = m*g*h
Now in order to relate momentum to this I'll take the derivative of both sides with respect to velocity
m*V = d ( m*g*h)/dV
so in words, momentum (in this instance) is the rate of change of potential energy with respect to velocity...
now its the " with respect to velocity" that Im having trouble grasping as a physical concept
Im thinking that this means that the only way its potential energy can change is if it experiences a change in velocity ( or vice versa) This seems logical to me, but I'm not quite sure if that is in fact how that quantity could be described and or will my instructor buy it..
perhaps it doesnt show anythig at all, I dont know
any thoughts appriciated
Eric