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First Law of Motion:             It states “A body remains at rest or continue to move with uniform velocity in a straight line, unless some unbalanced force acts upon it to change its state of rest or uniform motion” Inertia:             The property of a body to oppose any change in its state of rest or of uniform motion is called inertia.  Newton’s Second Law of Motion: “When a force is applied on a body, it produces acceleration in the body. The acceleration is in the direction of the force. The acceleration is directly proportional to the applied force and inversely proportional to the mass of the body.”             Mathematically   F=ma Force:             Force is an agent which when applied to a body changes or tends to change its sta...

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