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Gravity & Motion

8th Grade Physical science

TermDefinition
Gravity Force of attraction between objects due to their mass.
Law of Universal gravitation States that all objects attract each other through gravitational force.
Mass & Distance The strength of gravitational force between 2 objects depends on two factors.
Gravity A noncontact force that acts between two objects at any distance apart.
Mass A measure of the amount of matter in an object. Usually measured in grams or kilograms.
Weight A measure of the force of gravity acting on a object.
Free Fall When gravity is the ONLY force acting on an object. Measured as 9.8m/s² (meters per second squared)
Orbit When an object ravels around another object usually in space.
Air Resistance A force caused by air that acts in the opposite direction of the moving object.