Sun July 08, 2012 By: Pp Methuku

what is the easiest way to understand 2nd law of motion and momentum

Expert Reply
Mon July 09, 2012
The second law of motion tells that the force on a body is proportional to the rate of change of momentum of that body.
i.e. for  a mody having momentum, p = mv
the force on that body is proportional to dp/dt  = d(mv)/dt
for a body of constant mass,
F=k d(mv)/dt                       here k is the constant of proportionality, its value is chosen to be one
F = m dv/dt
F = ma
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