In What frame of reference are newton's laws are valid?

newtons laws are always valid in non inertial frames

Only in inertial reference frames.

"An object in motion will stay in motion unless acted upon by an unbalanced force." He was a genius... a person to look up to if you want to go into science, and a person to be proud of if you're not...

Newton's 1st Law: If F = 0 then object is at rest or in a uniform rectilinear motion.Newton's 2nd Law: F = ma. Starting from Newton's second Law: F = ma, if F = 0 then a = 0 then v = constant. then...

To recap, Newton's first law states that an object in motion will stay in motion with constant velocity given that there are no net forces acting upon it. For example, if a ball was pushed with zero...