raknath said:Why do we actually say that Newton's laws do not hold for non inertial frames. can you folks give me an example of how Newton's laws collapse in an non inertial frame(if they do at all)
And the fictitious forces do not obey Newton's 3rd law, so in patching the 1st and 2nd laws that way the 3rd law doesn't work any more.A.T. said:In accelerated frames objects with no forces acting on them accelerate. So you have to introduce "http://en.wikipedia.org/wiki/Fictitious_force" " to make Newtons laws work again.
The three laws of motion in Newton's laws are:
1. An object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force.
2. The force acting on an object is equal to its mass multiplied by its acceleration (F=ma).
3. For every action, there is an equal and opposite reaction.
In non-inertial frames of reference, objects may appear to accelerate even when no external forces are acting on them. This is due to the acceleration of the frame itself. However, Newton's laws still hold true in these frames of reference if we include fictitious forces to account for the acceleration of the frame.
A non-inertial frame of reference is a frame of reference that is accelerating or rotating. In these frames, objects may appear to experience forces even when no external forces are acting on them.
An inertial frame of reference is one in which Newton's laws of motion hold true without the need for fictitious forces. In contrast, a non-inertial frame of reference requires the inclusion of fictitious forces to accurately describe the motion of objects.
In Newton's laws, the force of gravity is considered an external force acting on an object. This force is proportional to the mass of the object and the acceleration due to gravity. It is included in the second law (F=ma) and can be used to calculate the motion of objects under the influence of gravity.