vivek mehto (roll no : 43)

motion:

motion is a change in position of an object with respect to time. Motion is typically described in terms of displacement, distance, velocity, acceleration, time and speed^[1] Motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame.







Low of motion:

In physics, motion is described through two sets of apparently contradictory laws of mechanics. Motions of all large scale and familiar objects in the universe  (such as projectiles, planets, cells, and humans) are described by classical mechanics. Whereas the motion of very small atomic and sub-atomic objects is described by quantum mechanics.

first low of motion;

I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

second low of motion:

II. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.

third low of motion:

III. For every action there is an equal and opposite reaction.