Eduwhere Concept: Newton's Law of Gravitation
Even if we all have learnt Newton’s law of gravitation in school and college, it has been a part of our studies after that too.
Here is a quick revision for Newton’s law of gravitation for your upcoming competitive examination.
Newton’s Law of Gravitation
Gravitational force (F) between two bodies is directly proportional to the product of masses and inversely proportional to the square of the distance between them.
Let m1 and m2 be the masses of two bodies and r be the separation between them.
F ∝ m1m2 / r2
Here, G is gravitational constant.
Value of G is (6.67 × 10-11 N m2 kg-2))
Acceleration due to gravity
For a body falling freely under gravity, the acceleration in the body is called acceleration due to gravity.
Relationship between g and G is given by
g = GMe /Re = 4/3 πGReΡ
where G = gravitational constant, Me and Re be the mass and radius of the earth.
Characteristics of gravitational force:
- It is always attractive.
- It is independent of the medium.
- It is a conservative and central force.
- It holds good over a wide range of distance.