Question

State Newton's second law of motion.

Answer 1

Newton's second law of motion states that the net force acting on the object is equal to the rate of change of linear momentum and this change in momentum takes place in the direction of the force applied.

Mathematically, $F=\frac{dP}{dt}$

As we know, P=mv

$F=\frac{mdv}{dt}+\frac{vdm}{dt}$

$F=ma+0\left(ifmassisconstant\right)$

$F=ma⟶\left(1\right)$

$and$

$F=m\left(0\right)+\frac{vdm}{dt}\left(ifmassisvariableandvelocityisconstant\right)$

$F=v\left(\frac{dm}{dt}\right)(variablemassconcept,forinstancefuelejectionfromrocket)$