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By a rigid body, we generally mean a hard solid object having a definite shape and size. In reality, solid bodies are not perfectly rigid. They can be stretched, compressed and bent. When an external force is applied, a body may get deformed. When the deforming force is removed, some bodies tend to regain their … Read more

Everybody in the universe attracts every other body with a force called force of gravitation. Thus, Gravitation is the force of attraction between any two bodies in the universe. The attraction between the sun and earth, the attraction between a table and a chair lying in a room, etc., are examples of gravitation. Gravitation is … Read more

According to Newton’s first law of motion, everybody continues in its state of rest or of uniform linear motion, unless an external force acts on it to change that state. This inability of a body to change by itself its state of rest or of linear uniform motion is called inertia. Similarly, a body rotating … Read more

Newton’s laws of motion are applicable to point objects. The introduction of the concept of centre of mass enables us to apply them equally well to the motion of finite or extended objects. The centre of mass of a body is a point where the whole mass of the body is supposed to be concentrated … Read more

In this article we will discuss about particle and system of particles. The study of system of particles is necessary to understand the concept of rotational motion. To understand system of particles, first we have to understand the meaning of a particle. What do you mean by a particle? A particle is defined as an … Read more

Physical quantities are classified into two categories on the basis of magnitude and direction. One is scalar and other is vector. Here in this article, we will discuss about scalar and vectors. Scalar quantities: The physical quantities which have only magnitude, and no direction are called scalar quantities or scalars. A scalar quantity can be … Read more

Mechanics is the branch of physics that deals with the conditions of rest or motion of the material objects around us. It is one of the oldest branches of physics. Sub-branches of mechanics (i) Statics: It is the branch of mechanics that deals with the study of objects at rest or in equilibrium, even when … Read more

In this article we will discuss about coefficient of restitution. Coefficient of restitution is also known as coefficient of resilience. Coefficient of restitution or coefficient of resilience Most of the real collisions are neither perfectly elastic nor perfectly plastic. They are partially elastic collisions, in which the K.E. reduces and so the speed of separation … Read more

A collision is said to occur between two bodies, either if they physically collide against each other or if the path of one is affected by the force exerted by the other. For a collision to take place, the actual physical contact is not necessary. In Rutherford’s scattering experiment, α-particles get scattered due to the … Read more

In this article we will discuss about the different forms of energy. Energy can manifest itself in many forms. Some of these forms are as follows: (i) Mechanical energy: The sum of the kinetic and potential energies in bulk is called mechanical energy. Kinetic energy is due to motion while the potential energy is due … Read more