Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
Newton's Law of Gravitation shows that if a person weighs w pounds on the surf ace of the earth, then his or her weight at distance x from the center of the earth is where R = 3960 miles is the radius of the earth. (a) Show that the weight lost at altitude h miles above the earth's surfaceis approximately ∆ W ≈ - (0.0005w)h. Hint: Use the Linear Approximation with dx = h. (b) Estimate the weight lost by a 200-lb football player flying in a jet at an altitude of 7 miles.
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