Electric potential: “Electric potential at a point in electric field is the amount of work done to bring the unit positive charge from infinity to that point.” The gravitational potential at point in the gravitational field is the gravitational potential energy of a unit mass placed at that point.In this way ,the electric potential at any point in the electric ...

Read More »## Difference between centripetal and centrifugal force

Centripetal force: “The force which is directed towards the centre of circle is called centripetal force.” Explanation: Consider a body moving with uniform speed in a circular path.In this case velocity changes only in direction and not in magnitude.Applying Newton’s first law of motion we find that some external force must be acting on the particle.Without presence of external force ...

Read More »## Difference between mass and weight

Unfortunately,weight and mass are often considered to be same quantities and misused in daily conversations.It is therefore essential for you to differentiate between these two physical quantities. Weight and mass difference: Properties of mass: Mass is the quantity of matter possessed by a body. It is a scalar quantity,which has magnitude only. Its unit is kilogram (kg). It is not ...

Read More »## Acceleration due to gravity formula and problems

What is gravitational acceleration? Acceleration of a freely falling bodies is called gravitational acceleration.The value of gravitational acceleration is 10 ms-². Why value of g varies with altitude? Above formula shows that the value of acceleration due to gravity g depends on the radius of the earth at its surface.The value of g is inversely proportional to the square ...

Read More »## What is the law of conservation of enegy

What does law of conservation of energy mean? According to law of conservation of energy:”Energy can neither be created nor is it destroyed.It can only be transformed from one form to another.A loss in one form of energy is accompanied by an equal increase in the other forms of energy.The total energy remains constant.” According to Einstein’s mass energy relation: ...

Read More »## Definition of motion in physics

Motion and its types physics: “A body is said to be in motion,if it changes its position with respect to its surroundings.” Surroundings are the places in its neighborhood where various objects are present.The state of rest or motion of a body is relative.For example,a passenger sitting in a moving bus is at rest because he is not changing his ...

Read More »## Moment of inertia units

Moment of inertia: Moment of inertia is defined as:”The sum of the products of the mass of each particle of the body and square of its perpendicular distance from axis.”For a rigid body moving about a fixed axis,the laws of motion have the same form as those of rectilinear motion,with moment of inertia replacing mass,angular replacing linear velocity,angular momentum replacing ...

Read More »## How to find density with mass and volume?

What is Density? “Mass per unit volume of a material is called density.”Density is an important property of any material.A homogeneous material such as ice or iron has the same density throughout.We use (the Greek letter rho) for density.If a mass m of homogeneous material has volume V ,the density is: Two objects made of the same material have the ...

Read More »## gravitational potential energy formula

What is potential energy? Potential energy is defined as:“Energy due to position is called potential energy.” When a diver jumps off a high board into a swimming pool,he hits the water moving pretty fast,with a lot of kinetic energy.Where does that energy come from?The answer is that gravitational force (his weight) does work on the diver as he falls.The diver’s ...

Read More »## kinematic Viscosity of water

What is Viscosity? “Viscosity is the internal friction in a fluid.”Viscous forces opposes the motion of one portion of a fluid relative to another.Viscosity is the reason it takes effort to paddle a canoe through calm water,but it is also the reason the paddle works.Viscous effects are important in the flow of fluids in pipes,the flow of blood,the lubrication of ...

Read More »