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## Main Question or Discussion Point

I have heard that newton's third law fails to apply in certain cases.

Is it true??

and if it is , is there a reason why it works in the remaining cases?

also regarding the second law F=dp/dt

is it how force is defined ??or is it a relation between force and change in momentum??

if it is how force is defined, then newton's second law cannot be wrong..

please anyone....

thanks in advance

Is it true??

and if it is , is there a reason why it works in the remaining cases?

also regarding the second law F=dp/dt

is it how force is defined ??or is it a relation between force and change in momentum??

if it is how force is defined, then newton's second law cannot be wrong..

please anyone....

thanks in advance