Various objects on this earth attract one another with the Gravitational force of Attraction constantly. But they do not cause any motion because the Gravitational force of Attraction between them is very small. However, if one of the bodies is large (like sun or earth) then the Gravitational force becomes very large.
1. Gravitation force of attraction depends on what factors?
2. What is the expression that can be obtained for the Gravitational Constant G
3. Why two objects of masses 1 kg and 2 kg lying on the ground not seems to attract each other eventhough there is a force of attraction between the two objects ?
4. If the mass of the earth is 6x1024 kg, then what will be the force of gravitation due to the earth on an object of mass 1 kg lying on the ground ? ( G=6.673x10-11 Nm2kg-2)
5. In what SI unit the magnitude of the Gravitational force is expressed ?
Answers
Answer:
The force of attraction existing between any two objects in the universe is called the gravitational force of attraction.
Explanation:
(1) The gravitational force of attraction between two objects depends on the masses of the objects and the distance between them.
(2) The expression for gravitational constant, G = Fd² / Mm. Where F is the gravitational force of attraction, d is the distance between them, and M and m are the masses of the objects.
(3) The force of attraction is proportional to the product of the masses. Here the masses of the objects are every less and hence their force of attraction will also be less.
(4) F = GMm / R²
G = 6.673 x 10⁻¹¹ Nm²/Kg², M = 6 × 10²⁴ Kg, m = 1 Kg, R = 6.37 × 10⁶ m
∴ F = (6.673 x 10⁻¹¹ × 6 × 10²⁴ × 1) / (6.37 × 10⁶)²
= 6.3 × 10⁷ N
(5) SI unit of gravitational force is Newton (N).