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Mechanics

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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Newton’s law of universal gravitation formula

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 went a step further in his analysis of gravity. In his examination of the orbits of the planets, he ...

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Vernier caliper least count formula

Vernier caliper is an instrument used to measure the length, diameter, radius etc. It can measure up to 1/10 of mm (or 0.1 mm 0.01 cm) which is called at least count of V.C.It is used by the lathe mechanic for making metallic cylinders of different sizes. There are two scales of V.C Vernier scale Main scale The main scale ...

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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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Archimedes principle formula and buoyant force

Pascal law Archimedes law Archimedes principle states that When an object is totally or partially immersed in a liquid, an upthrust acts on it equal to the weight of the liquid it displaces. An air filled balloon immediately shoots up to the surface when released under water. The same would happen if a piece of wood is released under water. ...

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dot product and cross product of vectors with examples and properties

 What is dot product of two vectors? When two vectors are multiplied with each other and answer is a scalar quantity then such a product is called scalar product or dot product of vectors. A dot (.) is placed between vectors which are multiplied with each other that’s why it is also called “dot product”. Scalar = vector .vector Vector ...

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Conservation of mechanical energy derivation and (5 examples )

Conservation of M.energy example A roller-coaster car moving without friction illustrates the conservation of mechanical energy.   Conservation of mechanical energy derivation To see what gravitational potential energy is good for, suppose the body’s weight is the only force acting on it,so: The body is then falling freely with no air resistance and can be moving either up or down. ...

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difference between centre of mass and centre of gravity

Centre of mass of a system is such a point where an applied force causes the system to move without rotation.And The centre of gravity of a body is the point where the whole weight of the body appears to act vertically downward. Centre of Mass “Centre of mass of a system is such a point where an applied force causes ...

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