What is linear inertia?????
It’s that characteristic of rest mass that keeps it going the way it is going until a net force changes that. This includes where the mass isn’t going at all; that is, it’s stationary. A good surrogate measure for linear inertia is linear momentum p = mv. As there are no net forces acting on this mass m, it will continue to do v velocity until a net force comes along to change that. This is expressed in Newton’s First Law of Motion. To change the momentum and overcome a mass’ linear inertia, we need a net force. Note that if dp = dmv = m dv is a change in momentum and, therefore, overcoming inertia, then doing this in some time interval gives us dp/dt = dmv/dt = m dv/dt = ma; where a = dv/dt is the time rate change of the velocity, otherwise known as acceleration. And look at this… dp/dt = ma = f is that net force needed to change the velocity of mass m. That is, a = f/m where the inertia is overcome when the velocity of mass m is altered over time. f = ma is Newton’s Law II, which a
