The formula for gravitational force on the earth and explain the symbols
Answers
We are used to calculating the Earth's gravitational force on objects in everyday life:
F = m * g downwards
But this is just a simplified version of the actual Law of Gravitation, which states that
any two objects attract each other with a force
m1 * m2 F = G * --------- R^2
where
G = 6.67 x 10^(-11) N * (kg^2) / (m^2)
m1 = mass of first object, in kg
m2 = mass of second object, in kg
R = distance between objects, in m
It turns out that gravity is very weak -- as indicated by the small value of the gravitational constant G . In fact, the gravitational force is so small that it's very difficult to measure the force between any two ordinary, everyday objects (such as people or cars). Scientists have had to resort to ingenious and delicate equipment to measure such tiny forces.
On the other hand, gravity is the dominant force between objects on the very largest scales: planets, stars and galaxies. So, even though it's weak, it still plays a big part in the universe.