State Newton.s law of gravitation. Distinguish between g and G.

Kepler's third law states that square of period revolution (T) of a planet around the sun is proportional to third power of average distance i between sun and planet i.e. T^(2)=Kr^(3) here K is constant if the mass of sun and planet are M and m respectively then as per Newton's law of gravitational the force of alteaction between them is F=(GMm)/(r^(2)) , here G is gravitational constant. The relation between G and K is described as

According to Newton's law of gravitation each particle attracts every other particle. But we do not see bodies on the surface of the earth moving towards each other. Why?

Statement I: The force of gravitation between a sphere and a rod of mass M_(2) is =(GM_(1)M_(2))//r . Statement II: Newton's law of gravitation holds correct for point masses.

Assertion : The centres of two cubes of masses m_(1) and m_(2) are separated by a distance r. The gravitational force between these two cubes will be (Gm_(1)m_(2))/(r^(2)) Reason : According to Newton's law of gravitation, gravitational force between two point masses m_(1) and m_(2) separated by a distance r is (Gm_(1)m_(2))/(r^(2)) .

Supposing Newton's law of gravitation for gravitation forces F_(1) and F_(2) between two masses m_(1) and m_(2) at positions r_(1) and r_(2) read where M_(0) is a constant of dimension of mass, r_(12) = r_(1) - r_(2) and n is a number. In such a case,

Newton's law of gravitation is universal because

State the Newton's laws of motion. What is the SI unit of force ?

State Newton's second law of motion. Under what condition does it take the form F = ma ?

State Newton's third law of motion.