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Mechanics

Accuracy and precision

Accuracy means how close a measured value is to the actual value and Precision means how close the measured values are to each other. We use many devices to measure physical quantities,such as length,time and temperature.They all have some limit of precision.Each device for measurement has some least count.The precision of the device depends on its least count ,therefore ,all ...

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kepler’s 3 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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Moment of inertia equation and formulas of rigid objects

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 the perpendicular distance from the axis of rotation is known as moment of inertia.   I = mr² For a rigid body moving about ...

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Difference between density,mass and volume with examples

Mass and density are two physical quantities.Mass is the quantity of matter of an object while density is mass per unit volume.They are two different quantities but these quantities have relationships with each other, higher will be the mass higher will be the density. Now! We are going learn in detail about mass and density. What is mass? The mass of ...

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Difference between electric potential and electric potential energy

Electric potential definition “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 ...

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Types of forces:contact and non contact forces with examples

Fundamental forces of nature Difference between conservative and non conservative forces Frictional forces What is Force? “A force moves or tends to move,stops or tends to stop the motion of object.The force can also change the direction of motion of an object.”It can also change the shape or size of a body on which it acts. In classical physics real ...

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Find angle between two vectors

The angle between two vectors is referred as a single point, known as the shortest angle by which we have to move around one of the two given vectors towards the position of codirectional with another vector.It is found by using the definition of the dot product of two vectors. How to find Angle between two vectors? We can find the ...

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Gravitational field strength:formula & definition

What is the Gravitational field? “The space around the earth in which earth can exert a force of attraction on other bodies is called gravitational field.”A basic fact of the gravitation is that to particles exerts forces on one another.This is a direct interaction between the two particles and is called the action at a distance because the two particles ...

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Atmospheric pressure:Definition,formula & applications

Atmospheric Pressure The Earth is surrounded by a cover of air called atmosphere. It extends to a few hundred kilometers above sea level. Just as certain sea creatures live at the bottom of ocean, we live at the bottom of a huge ocean of air. Air is a mixture of gases. The density of air in the atmosphere is not ...

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Second equation of motion derivation with graphical method

Second equation of motion Derivation Suppose a body is moving with initial velocity “Vi” after time t its velocity becomes Vf.The distance covered by the body is “S”.The acceleration of the body is represented by a. Explanation: Consider the speed time graph in which the initial velocity “Vi” of the body is represented by “OA”.After a time interval, OC the ...

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