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Gravity | Definition, Physics, & Facts | Britannica
Newton’s law of gravitation | Definition, Formula, & Facts | Britannica
Newton’s law of gravity - Encyclopedia Britannica
Gravity - Force, Physics, Theory | Britannica
Development of gravitational theory | Britannica
Center of gravity | Definition & Facts | Britannica
Friction | Definition, Types, & Formula | Britannica
Gravity - Acceleration, Earth, Moon | Britannica
Weight | Gravity, Mass & Force | Britannica
Gravity - Fields, Relativity, Theory | Britannica