What is mechanics in physics? The branch of science that deals with the study of motion of body,its causes and effects. The importance of mechanics It is the oldest of the physical sciences,is the study of the motion of objects.The calculation of the path of a baseball or of a space probe sent to Mars is among its problems,as is ...

A vector is represented graphically by a directed line segment or an arrow head line segment.The length of line,according to the scale chosen ,represents the magnitude of the vector while arrow head indicates the direction.Also they follow triangle law of addition.For example force,acceleration,torque,momentum ,angular momentum etc.To represent a vector we need: A suitable scale Reference axis x,y & z axis ...

Atmospheric Pressure The Earth is surrounded by a cover of air called atmosphere. It extends to a few hundred kilometers above sea level. Just as certain sea creatures live at the bottom of ocean, we live at the bottom of a huge ocean of air. Air is a mixture of gases. The density of air in the atmosphere is not ...

What is Pascal’s Law and how do we use it? An external force applied on the surface of a liquid increases the liquid pressure at the surface of the liquid. This increase in liquid pressure in transmitted equally in all directions and to the walls of the container in which it is filled. This result is called Pascal’s law which ...

Instantaneous velocity: “If a body covers small displacement in in small interval of time than its velocity will be instantaneous velocity such that Δt is equal to zero.”Where Δt is the small interval of time.Average velocity does not tell us about the motion between two points on the path.The path may be straight or curved and the motion may be steady or ...

Angular velocity “Time rate of change of angular displacement is known as angular velocity.”It is denoted by ω,its formula is given by: Unit of angular velocity is radian per second (rad s-1) . Very often we are interested in knowing how fast or how slow a body is rotating.It is determined by its angular velocity which is defined as the rate ...

Relation between escape velocity and orbital velocity formula What is the Escape velocity ? “The velocity required by a body to escape from the earth’s gravitational field.”It is our daily life experience that  an object projected upward comes back to the ground after rising to a certain height.This is due to the force of gravity acting downward.With increased initial velocity,the ...

Conservation of momentum: “The momentum of an isolated system of two or more than two interacting bodies remains constant.”Momentum of a system depends on its mass and velocity.A system is a group of bodies within certain boundaries .An isolated system is a group of interacting bodies on which no external force is acting.If no unbalanced or net force acts on ...

Types  of equilibrium in physics There are three states or types  of equilibrium in physics Stable equilibrium Unstable equilibrium Neutral equilibrium Stable equilibrium “A body is said to be in stable equilibrium if after a slight tilt it returns to its previous position.” Consider a book lying on the table.Tilt the book slightly about its one edge by lifting it ...

Centre of Mass “Centre of mass of a system is such a point where an applied force causes the system to move without rotation” It is observed that the centre of mass of a system moves as if its entire mass is confined at that point. A force applied at such a point in the body does not produce any ...