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the rate at which someone or something is able to move or operate.

how fast something can move

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Kinetic friction, also known as sliding friction or moving friction, is the amount of retarding force between two objects that are moving relative to each other.

the resistance to something when it is going fast over something.
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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.

keeps an object at rest

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Average speed can be viewed as the rate of change in distance with respect to time.

a ratio of distance to time

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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.

overall strength of force to one object.

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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.

equal and opposite reaction.
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a basis or standard for evaluation, assessment, or comparison; a criterion.

the standard point of an analysis

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increase in the rate or speed of something.

something going faster and faster.
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In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull.

moving something needs force

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the action or process of moving or being moved.

something being moved

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the resistance that one surface or object encounters when moving over another.

the resistance of something moving across another.
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