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a force that attracts any objects with mass

Example : when earth moves

Citation : http://examples.yourdictionary.com/examples-of-gravity.html

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the force that attracts a body toward the center of the earth, or toward any other physical body having mass

Example : Dropping a pencil

Citation : http://www.dictionary.com/browse/gravity

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the resistance that one surface or object encounters when moving over another

Example : rubbing your hands together creates friction

Citation : http://www.dictionary.com/browse/friction

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a form of motion in which an object or particle  is thrown near the Earth's surface, and it moves along a curved path under the action of gravity only

Example : any object that is pitched or thrown

Citation : http://www.physicstutorials.org/home/mechanics/1d-kinematics/projectile-motion?start=1

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the quantity of motion of a moving body, measured as a product of its mass and velocity

Example : a football player hits another football player

Citation : http://www.softschools.com/examples/science/momentum_examples/16/

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a vehicle's capacity to gain speed within a short time

Example : when a car is speeding up

Citation : http://study.com/academy/lesson/acceleration-definition-equation-and-examples.html

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a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving

Example : if the object is moving in a circle

Citation : http://www.physicsclassroom.com/class/circles/Lesson-1/The-Centripetal-Force-Requirement

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describes the forces that are in opposition to the re lative motion of an object as it passes through the air

Example : when you walk you are affected by air resistance but it doesn't slow you down

Citation : https://www.universetoday.com/73315/what-is-air-resistance/

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the rate at which someone or something is able to move or operate

Example : running

Citation : https://www.thoughtco.com/speed-2699009