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Inertia, property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity. It is a passive property and does not enable a body to do anything except oppose such active agents as forces and torques.
Inertia is the natural tendency of objects in motion to stay in motion and objects at rest to stay at rest, unless a force causes the velocity to change. It is one of the fundamental principles in classical physics, and described by Isaac Newton in his first law of motion (also known as The Principle of Inertia). [1]
The meaning of INERTIA is a property of matter by which it remains at rest or in uniform motion in the same straight line unless acted upon by some external force. How to use inertia in a sentence.
An object’s inertia determines what happens when a force is applied to it. Something with a lot of inertia, like a heavy, fast moving object, will resist changing its motion.
Law of inertia, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This law is also the first of Isaac Newton’s three laws of motion.
Inertia is the tendency of matter to resist change in Velocity. It is an inherent property of matter; the inertia of an object is directly proportional to its Mass and can in fact be used to define mass.
Inertia is the tendency for an object at rest to remain at rest, or for a moving object to remain in motion in a straight line with constant speed. This key property of objects was first described by Galileo.