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Physical power or strength possessed by a living being
http://www.dictionary.com/browse/force?s=t
When someone pulls on a rope the person is using force

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Rapidity in moving, going, traveling, proceeding, or performing.
http://www.dictionary.com/browse/speed?s=t
So car travels at a certain speed

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A change in velocity.
http://www.dictionary.com/browse/acceleration?s=t
When a car goes faster it accelerates

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The action or process of moving or of changing place or position;movement.
http://www.dictionary.com/browse/motion
So walking, diving and running is a type of motion

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Balance forces are two forces acting in opposite directions on an object, and equal in size.
http://eschooltoday.com/science/forces/balanced-forces.html

So if two people are pushing with the same force it won't move

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The sum of all the forces acting on an object.
http://study.com/academy/lesson/what-is-net-force-definition-magnitude-equations.html
So the car is using many different forces

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The rate of change in distance with respect to time.
http://study.com/academy/lesson/calculating-average-speed-formula-practice-problems.html
So the car is changing the average speed

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It is a force that keeps an object at rest.
http://www.softschools.com/formulas/physics/static_friction_formula/30/
So the rock has static friction because the man who is pushing it can't move it

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The resistance that one surface or object encounters when moving over another.
http://www.dictionary.com/browse/friction
So the man is pushing a box and on the smoother surface is easier than the rough surface

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It is the amount of retarding force between two objects that are moving relative to each other.
http://study.com/academy/lesson/coefficient-of-kinetic-friction-definition-formula-examples.html
So the the kid are using kinetic friction to go down the hill