Who can give me a brief ...........................?

Question

description about gravitation, conservation of momentum.

Answer 1

The conservation of momentum (and, therefore, energy) holds even though bodies are not physically touching. Two or more bodies in a system can and do exchange momentum as long as the combined (total, net) momentum of such system remains constant (is conserved)

The (law of the) conservation of momentum is generalized by combining Kepler's "force of gravitation between bodies is mutual" and Newton's "instant action" while recognizing mechanisms other than collision for momentum transfer. The 'other-than-collision' component is the QM component.

Answer 2

Gravitation is a property common to all matter in the universe.All matter in the universe, no matter where they are or what are they doing or whatever are they?, they will always attract each other with a force called gravitational force:

F= G * m1 * m2 / r^2

F-->Gravitational-force
m1--->mass of first matter
m2--->mass of second matter
r --->distance between the matters
G --->Universal Gravitational Constant = 6.673 x 10 ^ (-11)

About conservation of momentum,
the momentum of any object is always conserved if the net force on the object is ZERO.

momentum=m * v

m--->mass of the object
v --->velocity of the object

Answer 3

GRAVITATION:--

In physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive. In classical mechanics, gravitation arises out of the force of gravity (which is often used as a synonym for gravitation). In general relativity, gravitation arises out of spacetime being curved by the presence of mass, and is not a force. In quantum gravity theories, either the graviton is the postulated carrier of the gravitational force[1], or time-space itself is envisioned as discrete in nature, or both.

The gravitational attraction of the earth endows objects with weight and causes them to fall to the ground when dropped (the earth also moves toward the object, but only by an infinitesimal amount). Moreover, gravitation is the reason for the very existence of the earth, the sun, and other celestial bodies; without it matter would not have coalesced into these bodies and life as we know it would not exist. Gravitation is also responsible for keeping the earth and the other planets in their orbits around the sun, the moon in its orbit around the earth, for the formation of tides, and for various other natural phenomena that we observe.

CONSERVATION OF MOMENTUM:--

In classical mechanics, momentum (pl. momenta; SI unit kg m/s) is the product of the mass and velocity of an object.In general the momentum of an object can be conceptually thought of as the tendency for an object to continue to move in its direction of travel. As such, it is a natural consequence of Newton's first law.

Momentum is a conserved quantity, meaning that the total momentum of any closed system cannot be changed.

The principle of conservation of momentum states that the total amount of momentum of all the things in the universe will never change. One of the consequences of this is that the center of mass of any system of objects will always continue with the same velocity unless acted on by a force outside the system.

Conservation of momentum is a consequence of the homogeneity of space.

In an isolated system (one where external forces are absent) the total momentum will be constant: this is implied by Newton's first law of motion. Newton's third law of motion, the law of reciprocal actions, which dictates that the forces acting between systems are equal in magnitude, but opposite in sign, is due to the conservation of momentum.

Since momentum is a vector quantity it has direction. Thus, when a gun is fired, although overall movement has increased compared to before the shot was fired, the momentum of the bullet in one direction is equal in magnitude, but opposite in sign, to the momentum of the gun in the other direction. These then sum to zero which is equal to the zero momentum that was present before either the gun or the bullet was moving.