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Mechanics

difference between pressure and force

What is Pressure? “The force acting normally per unit area on the surface of a body is called pressure”. Press a pencil from its ends between the palms. The palm pressing the tip feels much more pain than the palm pressing its blunt end. We can push a drawing pin into a wooden board by pressing it by our thumb. ...

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Torque (turning effect of forces):Definition,examples & applications

How to find torque? “The turning effect of a force is called torque or moment of the force.” We open or close a door by pushing or pulling it.Here push or pull turn the door about its hinge or axis of rotation.The door is opened or closed due to the turning effect of the force acting on it. Before we ...

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first and second conditions of equilibrium with examples in mechanics

What is equilibrium in physics? “A body is said to be in equilibrium if no net force acts on it.”Newton’s first law of motion tells us that a body continues its state of rest or of uniform motion in a straight line if no resultant or net force acts on it.For example,a book lying on a table or a picture ...

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Work energy and power:Formulas,problems & solutions

What is work? “Work is a task or job  done when a force acts on a body and moves it in the direction of the force.”Generally ,it refers to perform some task or job. How to find work in physics? In science ,work has precise meaning.For example,a man carrying a load is doing work but he is not doing work ...

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alternative renewable 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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how many satellites does earth have ?

 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

 Space exploration in physics “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 ...

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Star

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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Different types of friction with examples in daily life

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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