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Mechanics

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 ...

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 ...

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 ...

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 ...

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 ...

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. ...

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. ...

Dimensional analysis physics examples and practice problems

Dimensional analysis definition All the physical quantities can be expressed in terms of seven fundamental quantities.The powers to which these fundamental physical quantities be raised are termed as “dimensions”.Using the method of dimensions called dimensional analysis. Each base quantity is considered a dimension expressed by specific symbol written within square brackets.It stands for qualitative nature of physical quantity.For example different ...