User:Navneet Pandey/sandbox

Limitations of Newton's laws of motion- Newton's 1st and 2nd laws appear to be violated if the observer himself is accelerated. If a particle is experiencing no force and its acceleration is zero relative to an observer, then another observer moving with an acceleration relative to the first one will see that particle is in acceleration, i.e. a fictitious force is acting on the particle, relative to the second observer. Newton realised the difficulty and he specified that his laws of motion are valid only when the observer is stationed in an inertial frame system. later Newton defined an inertial system as any system which is not accelerating relative to the fix stars which is hypothetical. According to the modern views, Newtons Third Laws Of Motion is NOT CORRECT when a force is acting at a distance because the forces or actions cannot move faster than the speed of light. In other words, if the first particle produces any change in the second particle, changed force or reaction reaches on the first particle after a finite interval of time. This means simultaneously action is not equal to reaction. for example, Let a charged particle move away from a wire carrying a current. The wire exerts a magnetic force on the charged particle, while at the same time the net force on the wire due to the particle is exactly ZERO. Remember that Newton's Third Law is still correct for the bodies at rest and for contact forces.