Question

2. Newton's second law may be expressed in two alternative forces:
F = ma
and F=∆p÷∆t
Out of these which force is universal and why?​

Answer 1

F = dM/dt is universal.

F= m1v1 - m2v2 / dt

Considering mass = constant,

F= m ( v1-v2)/Dr = ma

So, F = ma ( when, m = constant)

So, if mass is changing continuously then F= ma will not be applicable.

Ex: The term involving the derivative of the mass is responsible for the thrust in rocket propulsion and must be included in any problem where the mass changes continuously.

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