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Strength or energy as an attribute of physical action or movement.

He was thrown backward by the force of the
explosion
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The rate at which someone or something is able to move or operate.

Each of the possible gear ratios of a bicycle or motor vehicle.

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

Increase in the rate or speed of something.

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The action or process of moving or being moved.

When a car is moving it in motion

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

eschooltoday.com/science/forces/balanced-forces.html

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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
www.physicsclassroom.com

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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.
www.countcalculate.com

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Static friction is a force that keeps an object at rest.
Once an object is in motion, it experiences kinetic friction.
www.softschools.com

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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.
http://www.softschools.com

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Friction is when two object rub together .
When you rub your two hands together it creates heat and that friction
www.khanacademy.org