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The gravitational constant, approximately 6989667400000000000â 6.674Ã10â11 Nâm2/kg2 and denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies.
Newton's Theory of Gravity states that every object in the universe pulls on every other object. Every object feels this force, so it is a universal force. The force is always attractive; it is always a pull, never a push. Picture the force of gravity as the tension in an imaginary rope between two objects. What factors determine the strength of the pull between two objects? The masses of the two objects are important factors. Remember that mass is a measure of the amount of material in an object. Thus, mass is a measure of the number of pullers in that object. It makes sense that the more pullers there are, the stronger the pull.