^Average velocity Velocity between two instants is called average. Mathematically it is measured as the displacement covered per unit time spent. It is also a vector quantity directed in the direction of displacement. For motion along x – axis,
^Displacement versus distance Displacement Distance Between two points Length of shortest path Length of actual path Sign +ve or –ve +ve always Can be zero Yes No Direction Initial to final Meaningless SI unit meters meters Are equal Only for motion along straight line with no reversal
^Displacement Suppose a body is moving along a straight line. Let the straight line is along x – axis. Let at a time t1 it was situated at point A at a distance x1 from a fixed point O. Let it moves & at time t2 reaches point B situated at a distance x2 from […]
Position ^Position of an arbitrary point P at any time is described using cartesian coordinates i.e. P (x,y, z). For 1 D motion along x axis, y & z coordinates are zero, where as x coordinate may be + ve or – ve. 1, 2 & 3 – D motion If coordinate required to specify […]
^Point object An object is said to be a point object if it covers distance much greater than its size.
^Kinematics Kinematics is a branch of physics which deals with the study of motion of the objects without considering their cause. In kinematics we ignore the size of body & assume it to be a point particle.
^Description of motion Three parameters used to describe the motion of a body are; position, velocity & acceleration. Usually a reference point plus a clock is used to describe motion of an object.
Dynamics ^Dynamics is a branch of physics which deals with the study of motion of the objects considering their cause also.
Statics ^Statics is a branch of physics which deals with the conditions of objects at rest (i.e. static equilibrium).
^Mechanics It is a branch of physics which deals with the conditions of rest or motion of the objects. It is divided in three parts 1. Statics 2. Kinematics 3. Dynamics
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