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The SI unit for force is Newtons (N)

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Gravity: Force pulling down on an object.
Weight: Gravitational force on an object.
Mass: Matter in an object

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The two important factors are speed and direction

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Measured in m/s. Distance divided by time.

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A still object used to determine the motion of other objects

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Examples of friction on smooth and rough surfaces

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The forces are equal, and the box doesn't move.

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Friction: A force that opposes motion between two surfaces in contact.

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Force: Push/Pull exerted in order to change its motion.
Net Force: Combination of all forces acting on an object.
Newton: SI unit for force.

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Motion: Objects change relative to a reference point.
Speed: distance traveled divided by the time.
Velocity: Speed of an object in a particular direction.
Acceleration: Rate of which velocity changes over time

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A force that opposes motion