WEIGHTLESSNESS

The phenomenon of "weightlessness" occurs when there is no force of support on your body. When your body is effectively in "free fall", accelerating downward at the acceleration of gravity, then you are not being supported. The sensation of apparent weight comes from the support that you feel from the floor, from the seat, etc.

The question arises that why we feel weightless or float freely in the outer space?

Since,we know that-

W=mg                                  (1).....

Where:-

W-weight of object or the force exerted by (g) on a body (m) of unit mass.

g-acceleration due to gravity.

Now, putting g=0 (since there is no force of support on the body, g becomes negligible and in space g =0) we get:

W=m*0                   or...
W=0

Therfore due to w=0 we feel weightless.

UNDERSTANDING MASS & WEIGHT AND DIFFRENCE BETWEEN THEM:

                        MASS

The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else. All mechanical quantities can be defined in terms of mass, length, and time. The usual symbol for mass is m and its SI unit is the kilogram.

                        WEIGHT

The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.

DIFFRENCE 

Mass:

1.Mass is the amount of matter contained in a body.

2.Mass of the body is the constant quantity and does not change with the change of position or location.

3.It's SI unit is kilogram.

4.It is a scalar quantity and cantains only magnitude. 

Weight:

1.Weight is the force by which the earth attracts a body toward its centre, Or we can say it is the force on the object which is offered by the gravity.

2.Weight of the body is the variable quantity and changes with the change in position and location due to the acceleration of the gravity acting on it.

3.It's SI unit is newton.

4.It is vector quantity and contains both magnitude as well as direction also.

DIFFRENCE BETWEEN G & g:

Gravitational constant is the universal constant..it is denoted by G..it is numerically equal to the force experienced by one of the two unit masses placed at 1 metre apart..it is equal to 6.67*10^-11 Newton metre squared per kilogram squred.
While on the other hand, acceleration due to gravity is just the acceleration produced in any mass by the gravitational force of earth...it changes from place to place as per the distance between the mass and the centre of mass of the earth..in general, its value on the surface of the earth is 9.8 metre pes second squared.

FORMULAS OF ACCELERATION DUE TO GRAVITY

The acceleration due to gravity formula or the acceleration due to gravity equation can be derived from the fundamental equations of motion.
They are,
v = u + at,
s = ut + (12)12 at2 and
v2 – u2 = 2as

Where v = Final Velocity
u = Initial Velocity
a = Acceleration
t = time taken.

In case of motion under gravity, the acceleration a and the distance s in the above equations are replaced by gravity g and the height of the object h.
Thus the acceleration due to gravity equations are,
v = u + gt,
h = ut +  (1/2)* gt2 and
v2 – u2 = 2gh

Where,
h = Height from ground level and
g = acceleration due to gravity.

When an object is thrown vertically upwards with an initial velocity u, the acceleration due to gravity acts as a Negative acceleration. That is, the velocity of the object gets reduced progressively, becomes 0 at a certain height and then the object starts falling like a free fall. The height at which the final velocity becomes 0 is the maximum height that the object can reach for a given initial velocity.

For a vertical throw, the acceleration due to gravity formulas can be formed by plugging in v = 0 and g = -g in the fundamental equations of motion. In such a case, the acceleration due to gravity equations are,
u=gt,
h = ut -  (1/2)* gt2 and
u2 = 2gh

ACCELERATION DUE TO GRAVITY

The most common force observed is the force of gravity.
The reason of objects falling towards ground is that the Earth has an inherent property of exerting an attraction of force on the objects. This force is called force of gravity and the acceleration generated on the objects due to this force is called Acceleration due gravity .

As per the definition of force, the equation of force due to gravity is given by,
W = mg
where m = mass of the Object
g = acceleration due to gravity.

In this case, the force is better known as the weight of the object. Also the acceleration in this case is the acceleration due to gravity. It is a constant and denoted by the letter g. The approximate value of acceleration due to gravity in feet is 32 ft/s2 or in meters is 9.8 m/s2.These are the values of acceleration of gravity on the Earth.

G (MEANING & UNIT)

#‎Hello‬ ‪#‎BENDING‬ ‪#‎LOVERS‬
MEANING OF G:-
As explained in earlier post about gravity,now we move towards ‪#‎G‬ (gravitatinol constant).
According to Newton's law gravitation,
F=G*m1*m2/d^2
If m1=m2=1kg & d=1 metre,
Then F=G*1*1/1^2
F=G
Newton's gravitational constant G is numerically equal to the force of gravitation b/w 2 objects of unit mass each kept at a unit distance from each other.
UNIT OF G & ITS VALUE:-
Unit of G in S.I. is,
G=F*d^2/m1.m2
Where,
A)m-kg;
B)d-metre;
C)F-newton;
So, G=N*m^2/kg^2
This also written as Nm^2kg^-2.
Value of #G as found experimentally is 6.6734*10^-11 Nm^2/kg^2.

GRAVITATION

We are starting our ‪#‎BENDING rally now.....

Hope you all will enjoy and appreciate it.😎

‪#‎GRAVITATION‬

According to Newton's law of Gravitation,Every object in the universe attract every other object with a force which is proportional to the product of their masses and inversely proportional to sq. of their distance.

F ¤ m1*m2 ...(a)
F ¤ 1/d^2 ...(b)

Combining (a) & (b),we get

F ¤ m1*m2/d^2

Or F=G*m1*m2/d^2

Where G is constant of proportionality and is called ‪#‎universal_gravitational_constant‬