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Aug 11, 2021 · If an object’s velocity relative to a given frame is constant, then the frame is inertial. This means that for an inertial reference frame, Newton’s first law is valid. Equilibrium is achieved when the forces on a system are balanced.
Newton’s three laws of physics are the basis for mechanics. The first law states that a body at rest will stay at rest until a net external force acts upon it and that a body in motion will remain in motion at a constant velocity until acted on by a net external force.
This lecture introduces Newton’s Laws of Motion. The First Law on inertia states that every object will remain in a state of rest or uniform motion in a straight line unless acted upon by an external force. The Second Law (F = ma) relates the cause (the force F) to the acceleration.
To Newton, “uniform motion in a straight line” meant constant velocity, which includes the case of zero velocity, or rest. Therefore, the first law says that the velocity of an object remains constant if the net force on it is zero.
The constant velocity motion, also known as uniform rectilinear motion (u.r.m.), is the one with constant velocity, i.e., the trajectory is a straight line and the speed is constant. In this section we are going to explain: The concept of constant velocity motion. The equations of this motion.
Newton’s First Law of Motion. A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force. Note the repeated use of the verb “remains.”. We can think of this law as preserving the status quo of motion.
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