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Mechanics

Mass of earth and radius

Newton’s law of gravitation Gravitation (force of gravity) Gravitational field strength Derivation of mass of earth Consider a body of mass m on the surface of the earth.Let the mass of the earth be  M and radius of the earth be R,The distance of the body from the center of the earth will also be equal to the radius R ...

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Newton’s law of universal gravitation equation and examples

what is Newton’s universal law of gravitation? Newton’s law of gravitation can be stated as:”Everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.” Newton’s universal law of gravitation equation Consider two bodies of masses m1 and ...

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Difference between electric potential and electric potential energy

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 ...

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Difference between centripetal and centrifugal force with examples

Centripetal force definition “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 ...

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difference between mass and weight in tabular form

Difference between mass and weight in physics 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. 5 differences between mass and weight of a body Properties of mass Mass is the quantity of matter possessed by a body. It is a scalar ...

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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 ...

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law of conservation of energy examples and equation

State the law of conservation of energy 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: E=mc² ...

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Moment of inertia equation and formulas of rigid objects

What is 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.” Or : The product mass and the square of perpendicular distance from the axis of rotation is known as moment of inertia. Moment of inertia formula   I ...

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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 ...

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gravitational potential energy formula derivation and examples

Gravitational potential energy definition We know that a particle gains or loses kinetic energy because it interacts with other objects that exert forces on it.During any interaction,the change in a particle’s kinetic energy is equal to the work done on the particle by the forces that act on it. Examples of gravitational potential energy in everyday life In many situations ...

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