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any interaction that, when unopposed, will change the motion of an object

Ex : pushing a box

Citation : https://en.wikipedia.org/wiki/Force

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

Ex : 2 cars speeding on a freeway

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

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

Ex : Slowing down when you see a red stop light

Citation : https://en.wikipedia.org/wiki/Acceleration

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the action or process of moving or being moved.

Ex : Rolling a bowling ball causing the pins to fall.

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

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a basis or standard for evaluation, assessment, or comparison; a criterion.

Ex : When you are in a car and look out the window, you are moving faster than the car next to you.

Citation : https://www.collinsdictionary.com/us/dictionary/english/reference-point

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two forces acting in opposite directions on an object, and equal in size

Ex : Each person is pushing the same amount but in different directions. Therfore, there is no change in motion.

Citation : http://study.com/academy/lesson/balanced-forces-definition-examples.html

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the sum of all forces acting on an object

Ex : A red plane's difference between drag & thrust is 15 newtons to the left.

Citation : http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Determining-the-Net-Force

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viewed as the rate of change in distance with respect to time

Ex : driving 80 miles per hour. Then, driving 30 miles per hour. Then, driving 20 miles per hour. The average speed would be around 40 miles per hour.

Citation : http://www.dictionary.com/browse/average-speed

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a force that keeps an object at rest. It must be overcome to start moving the object.

Ex : Moving a very heavy rock

Citation : http://www.softschools.com/formulas/physics/static_friction_formula/30/

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a force that acts between moving surfaces. An object that is being moved over a surface will experience a force in the opposite direction as its movement.

Ex : Rubbing both hands together to create heat

Citation : http://www.softschools.com/formulas/physics/kinetic_friction_formula/92/

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

Ex : Sliding down ice

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