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Grade 11 Physics Workbook page 33
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Newton’s law of universal Gravitation
Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and indirectly proportional to the square of the distanc between their centres.
Mass
The amount of the matter in a body measured in kilogram (kg)
Weightlessness
The sensation experience when all contact forces are removed
Weight
The gravitational force the Earth exerts on any object or near its surface