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MOMENTUM: Linear momentum of a moving body is equal to the product of its mass and velocity. It is denoted by  It describes the quantity of motion contained in a body and how easy or difficult to stop a moving body. If a body of mass m moves with velocity  then its linear momentum is given by  As the velocity is a vector quantity, therefore, linear momentum is also vector quantity and its direction is same as that of velocity. Units:             In S.I system its units are Kg m/s or Ns Momentum and Newton’s Second Law of Motion: IMPULSE: When a large force acts upon a body for a very short interval of time and for this interval the product  x ∆t  is called impulse. Thus product of force and time for which force acts is called impulse of the force  Impulse = F x ∆t Impulse is a vector quantity, having same direction as that of force . Units:          ...

Displacement: Shortest distance between two points is called displacement                                                                OR The displacement is a change in the position of body form its initial position to final position Unit:  SI unit of displacement is metre (m)                    Dimension:             The dimension of displacement is [L] VELOCITY: The time rate of change of displacement is known as velocity. It is a vector quantity. Its direction is along the direction of displacement. Mathematically...

PHYSICAL QUANTITIES Physics deals with numerous physical quantities in terms of which the laws of physics are expressed. Volume, speed, force, time, mass, density, temperature, electric current e.t.c are few examples of physical quantities. Physical quantities classified into two categories: BASE AND DERIVED QUANTITIES We can define the base quantities as the minimum number of those physical quantities in terms of which other physical quantities can be defined. Derived quantities are those whose definitions are based on other physical quantities, that is, the base quantities. BASE AND DERIVED UNITS Base quantities are said to have base units and derived quantities have derived units. For example, if displacement (length) and time are chosen to be base quantities, then velocity is a derived quantity