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Mechanics

Fundamental units and their definitions

Units The fixed and definite quantity taken as the standard of reference with which other quantities of the same kind are measured is defined as a “unit”. Fundamental Units The units of fundamental quantities are called “fundamental units”. For example, units of length, mass and time or those of fundamental units. Table lists all fundamental and supplementary units and their ...

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Types of physical quantities

  These are quantities that are used to describe the laws of physics. Physical quantities may be divided into six categories. Constant or ratio Such quantities have the only magnitude, for example, refractive index, dielectric constant and specific gravity. Such quantities have no units. Scalars These quantities have magnitude and unit. Some of them may have direction also but vector ...

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Difference between asteroid,mateorites and comet

Asteroids Thousands of small, irregular shaped objects, called asteroids, orbit around the sun between Mars and Jupiter.More than 4000 have been discovered and namedThe largest, Ceres, measuring about 1000 Kilometers across, has now been reclassified as a dwarf planet. There may be up to a million asteroids measuring up to a kilometer or more across.Many are tiny specks too small ...

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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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