# Chapter-5(Law of Motion) ## Applications Of Law Of Motion

There are many applications of Law of Motion. Some important applications are as under. The circular motion of a car on a flat and bank road are as (I) Circular Motion Of A Car On Level Road When a vehicle goes round a curved road, it requires some centripetal force. While rounding the curve, the … ## Dynamics Of Circular Motion

As we know that acceleration of a body moving in a circle of radius r and velocity v is v²/r directed towards the centre. i.e. a = v²/r For a stone rotated in a circle by a string, the centripetal force is provided by the tension in the string. For a car taking a circular … ## Friction

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 … ## 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 … ## 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 … ## Apparent Weight Of a Man In a Lift

Let we consider a man of mass m is standing on a weighting machine placed in an elevator or lift. The actual weight mg of the man acts on the weighting machine and offers a reaction R given by the reading of the weighting machine. This reaction R exerted by the surface of contact on … ## Newton’s Third Law Of Motion

This law state that ” For every action, there is always an equal and opposite reaction. In simple terms, the third law can be e stated as follows Force in nature always occurs in pairs. Force on a body A by body B is equal and opposite to the force on the body B to … ## Impulse

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 … ## Newton’s Second Law Of Motion

This law state that ” The rate of change of linear momentum of a body is directly proportional to the applied force and the change takes place in the direction of the applied force”. Let F be the external force applied on the body in the direction of motion of the body for time interval … ## Momentum

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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