distinguish between inertial and non inertial forces
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Inertia is the property of matter in which an object that is at rest wants to remain at rest, and an object that is moving wants to remain moving in a straight line unless another force acts upon it. Likewise, an inertial frame of reference is a reference frame in which an object stays either at rest or at a constant velocity unless another force acts upon it.
Inertial Frame of Reference: -
- Inertial frames are ones which are at rest or moving with uniform velocity with respect to fixed stars.
- For an observer in such a frame of reference Newton's second law of motion is valid.
- Ex: A train moving with uniform velocity is an inertial frame.
Non Inertial Frame of Reference: -
- A non inertial frame is one which is accelerated ( linearly or due to rotation) with respect to fixed stars.
- Newton's second law of motion is not valid in such a frame of reference, unless we introduce a force called pseudo - force.
- Ex: A freely falling elevator may be taken as a non inertial frame.
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