Gravity: The Gravitational Force of earth
It is the force of attraction exerted by earth towards its centre on a body lying on or near the surface of the earth....
Universal law of Gravitation
Gravitation is the name given to the force of attraction acting between any two bodies of the universe.
Newton’s reasoning was that the moon revolving...
Kepler’s law of planetary motion
The three laws of Kepler can be stated as follows:
Kepler’s first law (law of orbit):
Every planet revolves around the sun in an elliptical orbit...
Rolling Motion
The combination of rotational motion and the translation motion of a rigid body is known as rolling motion.
The kinetic energy associated with a body...
Moment of Inertia
The inertia of rotational motion is called the moment of inertia. It is denoted by L.
Moment of inertia is the property of an object...
Rigid body Rotation and Equation of Rotational motion
The resultant torque acting on the body must be zero. The sum of anti-clockwise torques about any axis must be equal to the sum...
Equilibrium of Rigid Bodies
A rigid body is said to be in mechanical equilibrium if both its linear momentum and angular momentum are not changing with time, or...
Angular Momentum (ρ)
The quantity of rotational motion in a body is called its angular momentum. Thus angular momentum plays the same role in rotational motion as...
Moment of force (Torque)
The motion of a rigid body, in general, is a combination of rotation and translation. If the body is fixed at a point or...
Centre of mass of a Uniform Rod
Suppose a rod of mass M and length L is lying along the x-axis with its one end at x = 0 and the...