The force of gravity acting on a body having unit mass placed on or near the surface of the Earth is known as acceleration due to gravity. Let the earth to be a sphere of radius R and uniform density ρ, then mass will be Mass = Volume ×Density If point mass m is situated […]
The value of the gravitational constant G was first determine experimentally by English scientist Henry Cavendish in 1798. Two small lead spheres of mass m each are connected to the end of a rod of length L which is suspended from its midpoint by a fine quartz fibre, forming a torsion balance. Two large lead
According to the principal of superposition, the gravitational force between two masses acts independently and uninfluenced by the presence of other bodies. Hence, the resultant gravitational force acting on a particle due to a number of masses is the vector sum of the gravitational forces exerted by the individual masses on the given particle. The
Let we consider two bodies A and B of masses m₁ and m₂ and separated by a distance r. Thus, vector form of the law of gravitation implies that the gravitational force acting between two particle form action and reaction pair. As F₁₂ and F₂₁ are directed towards the center of the two particles, so
This law state that ”Every body in this universe attracts each other with a force whose magnitude is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. This force acts along the line joining the centres of two bodies. Let two bodies of masses
Kepler’s law of planetary motion are 3 scientific laws describing motion of planets around the sun. 1. Kepler’s First Law Of Orbits According to this law, all planets move in elliptical orbits with the sun situated at one of the foci of the ellipse. The ellipse has two foci S the S’, the sun remains
In early days, people were observing the heavenly bodies like sun, moon, stars, planets etc, and their movement. It was the Italian physicist Galileo,(1564-1642), who recognised all the heavenly bodies like the sun, planets, the moon etc., are moving around the earth which is stationary and was taken as the centre of the universe. The
