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Author Archives: admin

Newton’s law of universal gravitation formula

What is Gravitation? 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 to earth when released. The motions of the planets,including the sun and the moon,which ...

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What is force of friction?

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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what is the law of conservation of momentum

What is momentum? “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 ...

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Different types of forces and their examples

What is Force? “A force moves or tends to move,stops or tends to stop the motion of object.The force can also change the direction of motion of an object.”It can also change the shape or size of a body on which it acts. In classical physics real forces are defined by a set of axioms,Newton’s laws of motion,with reference to ...

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Projectile motion equations

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. What is projectile motion? “Projectile motion is two dimensional motion under constant acceleration.”or When a body is thrown vertically upward then it follows a curved path such a motion of body is called ...

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Kinematic equations problems

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 line.Hence,we ...

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what is acceleration in physics?

What is acceleration in physics? “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 ...

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What is the difference between speed and velocity

What is  velocity? 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. What is the formula for ...

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Speed velocity and acceleration

Speed Velocity Acceleration What is meaning of speed? “The distance covered by an object in unit time is called its speed”.In other words ,the rate at which object is moving is called speed.Unit time may be a second,an hour,a day or a year.It tells us how fast or slow an object is moving .Its formula is given as: Here S ...

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which are renewable energy sources

Renewable energy sources: “Renewable energy sources are those energy sources that can be regenerated quickly.”There are many sources of energy such as coal,oil and natural gas.These fuels are called fossil fuels.These fuels would not last forever.They are not recoverable.These sources are called non renewable energy sources. The shortage of fossil fuels will create serious energy problems.We must look for alternative ...

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