Chapter-5(Law of Motion)



Whenever a body moves or tends to move over the surface of another body, a force comes into play which acts parallel to the surface of contact and opposes the relative motion. This opposing force is called friction. Let a wooden block place on a horizontal surface and give it a gentle push. The block

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Common Forces In Mechanics

In mechanics we encounter several kinds of forces. (I) Non-Contact Force The gravitational force is all pervasive. Every object on the earth experience the force of gravity due to Earth. It is a non-contact force. (II) Contact Force A contact force on an object arises due to contact with some other object solid, liquid or

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Conservation Of Momentum

According to this principle In the absence of an external force, the total momentum of a system remains constant or conserved and does not change with time. F (external) = 0 In an isolated system mutual forces between pairs of particles in the system causes Momentum change in individual particles. But as the mutual forces

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Impulse 1


A large force acting for a short time to produce a finite change in momentum is called an impulsive force. Example: (I) Force exerted by a bat, while heating a ball. (II) Blow of hammer on a nail. Expression For an Impulse Let we consider a constant force F which acts on a body for

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Momentum of a body is the quantity of motion poses by the body. It is defined to be the product of its mass m and velocity v. It is denoted by p. Momentum, P = mv SI unit of momentum is kgm/s. In CGS system gcm/s. It’s dimensional formula is [MLT⁻¹]. Variation Of Momentum Case-I:

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