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Mechanics

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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what is the difference between mass and weight in tabular form?

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 ...

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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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Viscosity of fluids and Poiseuille’s law with applications

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 ...

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Work energy theorem derivation:examples and problems

Work kinetic energy theorem Work energy theorem states that:“The net work done by the forces acting on the body is equal to the change in kinetic energy of the body.”Mathematically it is expressed as: Work energy theorem formula Wnet = Kf –Ki = ∆k An unbalanced force applied to a particle will certainly change the particle’s state of motion.Newton’s second law provides ...

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kepler’s laws of planetary motion definition and equation

What are kepler’s three laws of planetary motion? Using newton’s laws of motion and law of universal gravitation,we can understand and analyze the behavior of all the bodies in the solar system:the orbits of the planets and comets about the sun and of natural and artificial satellites about their planets.We make two assumption that simplify the analysis: We consider the ...

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