Question

why is F≠ma?

what are all the cases when F≠mass×accleration

Answer 1

when we apply force but there is no acceleration in the system f is not equal to m.a

Answer 2

According to Newton's second law of motion

the force applied on a body is equal to the rate of change of momentum it undergoes

implying,

dp/dt=Force

ie.d(mv)/dt=F

when m is constant,

we get F=M×A
but is m isn't constant F is not equal to m×a


but F=[(m)dv/dt]+[(v)dm/dt]