Gravity Motion and Forces Physics Science

Gravity is the force of attraction between massive particles. Weight is determined by the mass of an object and its location in a gravitational field. Gravity, simply put, is acceleration. F=ma means that there must be a force that causes a mass to accelerate. For a rocket ship, that is the rocket motor. For the earth, that is the compression of the mass between something on the surface of the earth and the earth's center of mass. While a great deal is known about the properties of gravity, the ultimate cause of the gravitational force remains an open question. General relativity is the most successful theory of gravitation to date. It postulates that mass and energy curve space-time, resulting in the phenomenon known as gravity.

• Newton's Law - Offers a discussion in simple language. Includes jokes physics as well physics as explanation of gravitational formula.
• Your Weight on Other Worlds - From the Exploratorium, an interactive calculator that will determine a person's weight on another planet.
• The Pendulum Lab - A virtual laboratory focused on hands-on experiments at motion and forces rigid pendula. Includes explanatory text.

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