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# Mechanics

## Life cycle of a star and black hole

What are stars? On the clear night we can see a cloudy band that stretches North to South across the sky.in fact we are seeing part of our own galaxy,the Milky way.there countless stars in our galaxy. We cannot see our galaxy as a whole, but scientists can see many other galaxies in the sky. We see many twinkling lights ...

## Gravitation:examples of gravitational force

Newton’s law of universal gravitation Mass of earth derivation Gravitational field strength What is Gravitation (force of gravity)? Gravitation or gravity is defined as:”The force of attraction between any two objects in the universe.” History: From at least the time of the ancient Greeks,two problems were the subjects of searching inquiry: The tendency of objects such as stones to  fall ...

## Types of friction with examples

What is friction in physics? “The force that opposes the motion of moving objects is called friction.” Have you ever noticed why a moving ball stops?Why bicycle stops when the cyclist stops pedaling?Naturally there must be some force that stops moving objects.Since a force not only moves an object but also stops moving object.Friction is a force that comes into ...

## Impulse momentum equation with examples and applications in real life

“Momentum of a body is the quantity of motion it possesses due to its mass and velocity.”We are aware of the fact that moving object possesses a quality by virtue of which it exerts a force on anything that tries to stop it.The faster the object is travelling ,the harder is to stop it.Similarly,if two objects move with the same ...

## Types of projectile motion with examples and equations

What is a projectile? A body thrown at a some angle θ above or below the horizontal such that (0 < θ < π/2) and moves freely under the action of gravity is called projectile. Examples of projectile A bomb released from an aeroplane in level flight A bullet fired from a gun An arrow released from bow A Javelin thrown by an athlete Definition ...

## what are kinematic equations of motion?

Kinematics is the branch of mechanics dealing with the motion of bodies without reference to mass or force.There are three basic equations of motion for bodies moving with uniform acceleration.These equations relate initial velocity, final velocity, acceleration, time and distance covered by a moving body.To simplify the derivation of these equations, we assume that the motion is along a straight ...

## acceleration:definition,formula,examples and problems

“Acceleration is defined as the rate of change of velocity of a body.”In many cases the velocity of a body changes  due to a change either in its magnitude or direction or both.The change in the velocity of a body causes acceleration in it.If an object is moving at a constant speed but changes its direction as it moves (such ...

## Average velocity formula with examples

Velocity is defined as:”The rate of displacement of a body is called its velocity.”The velocity tells us not only the speed of a body but also the direction along which the body is moving.Velocity of a body is a vector quantity.It is equal to the displacement of a body in unit time.And is represented as:           ...