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Force means strength or energy as an attribute of physical action or movement.
For example, "he was thrown backward by the force of the explosion."
http://www.dictionary.com/browse/force

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Speed means rapidity in moving, going, traveling, proceeding, or performing.
For example, The speed of light or the speed of sound.
http://www.dictionary.com/browse/speed

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Acceleration means the act of accelerating  increase of speed or velocity.
For example,  You change speed when you go faster. When you are merging onto a freeway and speed up to fit into the flow of traffic you are accelerating.
https://socratic.org/questions/what-are-some-examples-of-acceleration

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Motion is the action or process of moving or of changing place or position or movement.
For example, To motion a person to a seat.
http://www.dictionary.com/browse/motion?s=t

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Reference Point is an indicator that orients you generally.
For examples, Reference credible sources to strengthen your argument.
https://www.vocabulary.com/dictionary/reference%20point

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two forces acting in opposite directions on an object, and equal in size.
For example, The force exerted by each person is equal, but they are pushing in opposite directions, in this case together.
http://eschooltoday.com/science/forces/balanced-forces.html

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A net force is defined as the sum of all the forces acting on an object.
For example, If u have force either way u still have zero net force.
http://zonalandeducation.com/mstm/physics/mechanics/forces/newton/newtonLaw1.html

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a scalar measure of the rate of movement of a body expressed as the distance traveled divided by the time taken.
For example, we might say that a car has an average speed of 25 miles per hour.
https://www.collinsdictionary.com/us/dictionary/english/average-speed

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a force that keeps an object at rest. It must be overcome to start moving the object.
For example, friction that exists between a stationary object and the surface on which it's resting.
http://www.softschools.com/formulas/physics/static_friction_formula/30/

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the amount of retarding force between two objects that are moving relative to each other.
For example, Rubbing both hands together to create heat.
http://study.com/academy/lesson/coefficient-of-kinetic-friction-definition-formula-examples.html

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the resistance that one surface or object encounters when moving over another.
For example, "a lubrication system that reduces friction."
http://www.dictionary.com/browse/friction