Motion In A Plane

Scalar quantity is one which has magnitude only, example time, temperature, flux density. But vector quantity is one which has both magnitude and direction. In physics magnetic field is an entity produced by moving electric charges (electric currents) exerting a force on the other moving charges. A magnetic field is a vector quantity it associates with every point in space, a (pseudo) vector that may vary in time. The direction of the field is the equilibrium direction of a compass needle placed in the field.

From triangle law of vectors minimum three vectors are required to give zero resultant.

Upto ordinary heights, the change in the distance of a projectile from the centre of earth is negligibie compared to the radius of earth. Hence, the projectile moves under a nearly uniform gravitational force and the path is parabolic. But for the projectiles moving to a large height, the gravitational force decreases quite decreasing variable force, the path of the projectile becomes elliptical.

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