Causes of Friction   If we see the surface of material bodies through microscope, we observe that they are not smooth. Even the most polished surfaces are uneven. When one surface is placed over another, the elevations of one get interlocked with the depression of the other. Thus they oppose relative motion. The opposition is…

Friction in Physics   When a body moves over the surface of another body then the opposing force is produce and this opposing force is called force of friction.   Explanation   Suppose a wooden block is placed on a table and a spring balance is attached on it. If we apply a very small…

Law of Conservation of Momentum   In any collision or interaction between two or more objects in an isolated system, the total momentum before collision is equal to the total momentum after collision.   Example:   Consider two bodies A and B of mass m1 and m2 moving in the same direction with velocity U1…

Newton’s Third Law of Physics   Newton’s Third Law For every action there is an equal and opposite reaction.   Explanation:   According to Newton’s Law of Motion, we have:   F (Action) = – F (Reaction     The negative (-) sign indicates that the two forces are parallel but in the opposite direction.…

Difference between Mass and Weight   Mass   The quantity of matter present in a body is called mass. The mass of a body remains constant everywhere and does not change by change in altitude. Mass of a body possesses no direction. So it is a scalar quantity. Mass can be determined by a physical…

Weight in Physics   Weight   It is a force with which earth attracts towards its centre is called weight.   Formula: W = mg   Unit:   The unit of weight in M.K.S system is Newton (N).   You spend 15 minutes snoozing on your phone after waking up or before bed. It may…

Newton’s Second Law of Motion   The acceleration of a body, “a” is directly proportional to the net force acting upon it F, and inversely proportional to its Mass “m”.   Derivation   According To The Newton‘s Second law of motion when a force acts on an object it produces an acceleration which is directly…

Newton’s First Law of Motion   Statement: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.   Explanation:   This law consists of a two parts (a) When body is at rest (b) When body is moving with uniform velocity…

Inertia in Physics   – Natural characteristics of an object to oppose any attempted change on its original state, whether at rest or in motion.   – Tendency of an object to remain at rest, or to keep moving at constant speed in a straight line.   Do you think the love of reading should…

Definition of Potential Energy   Potential energy is the energy within an object because of its position or state. Gravitational potential energy: E = mgh       Where:   E = Potential Energy [J]   M = Mass [kg]   g = Gravitational Acceleration [m s-2]   h = height of the location of…