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the action or process of moving or being moved.
http://www.dictionary.com/

The ball hits the other and they all move in motion

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a vehicle's capacity to gain speed within a short time.
http://www.dictionary.com/

The cart accelerates the faster it goes down

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he rate at which someone or something is able to move or operate.
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The train has a fast speed.

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strength or energy as an attribute of physical action or movement.
http://www.dictionary.com/

The people are forcing each other to move the rope to their side.

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the action or process of moving or being moved.

Friction is how much grip you have.

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In physics, the Net force is the overall force acting on an object. To calculate net force, the body is isolated and interactions with the environment or other constraints are represented as forces and torques in a free-body diagram.
https://en.wikipedia.org/wiki/Net_force

What the 2 guys are doing is called net force.

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Kinetic friction is 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. The magnitude of the force depends on the coefficient of kinetic friction between the two kinds of material.
http://www.softschools.com/formulas/physics/kinetic_friction_formula/92/

Kinetic friction is the box staying still on the floor.

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Average speed can be viewed as the rate of change in distance with respect to time. A car traveling at an average speed of 25 miles per hour covers an average distance of 25 miles every hour
http://study.com/academy/lesson/calculating-average-speed-formula-practice-problems.html

Speed is distance

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Static friction is a force that keeps an object at rest. It must be overcome to start moving the object. Once an object is in motion, it experiences kinetic friction. If a small amount of force is applied to an object, the static friction has an equal magnitude in the opposite direction.
http://www.softschools.com/formulas/physics/static_friction_formula/30/

Static friction is what keep a item in place.

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a basis or standard for evaluation, assessment, or comparison; a criterion.
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The train is moving left and right and that make reference points.

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Balance forces are two forces acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an abject, the object stays still or continues moving continues to move at the same speed and in the same direction.
http://eschooltoday.com/science/forces/balanced-forces.html

The box pushed down the table but the table holds the box this is balanced force.