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the rate at which someone or something is able to move or operate. Example: we turned onto the runway and began to gather speed.citation: www.thoughtco.com

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction. Example: I went to the mountain and slide off. Citation: en.wikipedia.org

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Kinetic friction is a force that acts between moving surfaces. Example: An object that is being moved over a surface will experience a force in the opposite direction as its movement. Citation; www.softschools.com

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Balance force are two forces acting in opposite directions on an object, and equal in size. Example: An object stays still or continues moving continues to move at the same speed and in the same direction. Citation: eschooltoday.com

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a basis or standard for evaluation, assessment, or comparison; a criterion. Example: Of course the bookcase would have nothing to do with the butterfly, but simply be used as a reference point to describe its position. citation: www.collinsdictionary.com

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A net force is the sum of all force acting on an object. Example: the difference between drag and thrust is 15 Newtons , to the left. Citation: www.mansfieldct.org

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a vehicle's capacity to gain speed within a short time. Example: a Formula One car is superior to an Indy car in its acceleration. citation: en.wikipedia.org

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the action or process of moving or being moved. Example: the laws of planetary motion. citation: www.dictionary.com

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Average speed can be viewed as the rate of change in distance with respect to time. Example: a car traveling at an average speed of 25 miles per hour covers an average distance of 25 miles every hour. Citation: study.com

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Static friction is a force that keeps an object at rest. It must be overcome to start moving the object. Example: Once an object is in motion, it experiences kinetic friction. Citation: www.sofschools.com