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Gravity & Motion

8th Grade Physical science

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.