can someone please explain the universal law of gravitation?

Question

i have difficulty in understanding F=G M x m/d2 (d square). how do you get that?what is the difference between mass and weight?

Answer 1

Your mass stays the same everywhere, but your weight, how heavy you are, depends on how strong the gravitational pull on you is, so you weigh less on the Moon than here. The universal law of gravitation says that every object in the universe attracts every other object, no matter how far away. The strength of the attraction equals the mass of one object times the mass of the other divided by the distance between their centres squared, all multiplied by a number called the Universal Constant of Gravitation.

Answer 2

Every bit of matter has mass. It does not depend on the strenghh of gravity.

Weight, on the other hand, is basically a force. It is the force due to the attraction of a body by another's gravitationl field.

It is hard to explain using standard measurements, but easy to see with the metric system. The pound is not a unit of mass, but a unit of weight.

In the metric system, the unit of weight is the same as the unit of force (newton). The unit of mass is the kilogram.

Then in the universal law of gravitation, what we use is mass (kilograms). The F, then is a force (newtons). It's that simple.

Answer 3

The universal law of gravitation states that every body attracts every other body with a force that is directly proportional to the mass of the body and inversely proportional to the square of the distance between them.....when you apply that to two masses m and M the force is directly proportional to their product and since its inversely proportional to distance square we have F=G M x m/d^2 where G is nothing but the proportionality constant also known as the gravitational constant.....for more refer any book on school level basic physics

Answer 4

First thing you should know that F=MA.
F=force= weight.
A=acceleration could be any number
G= acceleration of the earth which has a a specific number of acceleration
M= mass

Mass NEVER change but the FORCE DOES.
Thats where acceleration play the role.

mass is indepent, but acceleration changes.
lets say earth and moon
earth has bigger acceleration but moon has small accelration

so when you multiply acceration with mass
you have a stronger force or weight on earth and a small force on the moon

Answer 5

it is newton's. if we have too mass, they attracts each other. the attraction force is F which we can be calculate it from that equation: F=GMm/r^2.
U and earth are too massers! then U attract each other.
this attraction is your weight.
F(weight) = G * M(earths mass) * m(yours!) / r(earths radious) ^2
so your weigh in earth is different form yours in moon or any place. but your mass is always the same;)

Answer 6

I don't think you need extra explanation from the previous answers!!
They are clearly explained so I don't think there is something else for me to say =p