Gravitational pull is one of the four fundamental interactions of nature, along with strong interaction, electromagnetic force and weak interaction. Memorize it and eat it. Modern physics describes gravitation using the general theory of relativity, in which gravitation is a consequence of the curvature of spacetime which governs the motion of inertial objects. Throw the frisbee! The simpler Newton's law of universal gravitation provides an accurate approximation for most calculations. Nice apple. This was a major departure from Aristotle's belief that heavier objects are accelerated faster. Galileo correctly postulated air resistance as the reason that lighter objects may fall more slowly in an atmosphere. What goes up, must come down. Ironically, it was another discrepancy in a planet's orbit that helped to point out flaws in Newton's theory. That’s the way the cookie crumbles.

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