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Mechanics

Solar energy:applications of solar energy

What is solar energy? “Solar energy is the energy coming from the sun and is used directly and indirectly.”The earth receives huge amount of energy directly from the sun each day.Solar energy at normal incidence outside the earth’s atmosphere is about 1.4 kWm-2 which is referred as solar constant.While passing through the atmosphere,the total energy is reduced due to reflection,scattering ...

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Difference between natural satellite and artificial satellite

 What is a satellite? Any heavenly body that moves around a planet s called a satellite. The Moon is a natural satellite of the Earth that orbits the Earth. Mars, Jupiter,Saturn,Uranus and Neptune have their own satellites too. Natural Satellites Beside moons of the planets, some other natural satellites are also moving around the Sun. These are asteroids, comets and ...

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Benefits and advantages of space exploration list for mankind

“Scientific study of the space using especially developed technology is called space exploration.”Do you know that all stars,the sun,the Moon,the earth,all planets and satellites are called heavenly bodies?The heavenly bodies are moving in unimaginable vast space universe. The sun,the planets,and their moons are the largest objects in the solar system.But asteroids and comets are the smaller parts of the solar ...

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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 ...

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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 ...

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Types of friction with examples,advantages and disadvantages

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 ...

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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 ...

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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 ...

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what are kinematic equations of motion?

5 kinematic equations

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 ...

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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 ...

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