Universal Gravitational Law
Gravitational attraction of two objects depends upon mass of objects and the distance between them
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The gravitational attraction of two objects depends upon the mass of each object and the distance between them. This relationship is called the Gravitational Law and can be expressed as
F = kG m1 m2 / r2 (1)
where
F = gravitational force (N, lbf)
kG = universal gravitation constant = 6.668 10-11 (Nm2/kg2)
m = mass of object (kg)
r = distance between objects (m)
Example - The gravitational force on a person on earth's surface
The gravitational force (weight) on a person of 70 kg on the earth's surface (6.37 106 m from the earth's center) can be expressed as
F = (6.668 10-11 Nm2/kg2) (5.98 1024 kg) (70 kg) / (6.37 106 m)2
= 688.1 (N)
- 5.98 1024 (kg) = mass of earth
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Related Topics
- Dynamics - Dynamics Motion - velocity and acceleration
- Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects
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Related Documents
- Acceleration of Gravity and Newton's Second Law - Acceleration of gravity and Newton's Second Law - SI and Imperial units





