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Kilogram is the SI unit for mass

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An objects mass does not change based on location

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how much matter in an object

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Weight changes when gravitational force changes

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gravitational force acting on an object

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Gravitational force decreases as distance increases

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Gravitational force increases as mass increases

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The size of the force depends on the masses of the objects and the distance between objects

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All objects in the universe attract each other though gravitational force. The larger the mass, the more gravitational pull between the objects.

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The force of gravity can change the motion of an object by changing it's speed, direction, or both

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force of attraction between two objects due to their masses

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gravity is an unseen force

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a diagram showing all the forces acting on an object

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friction can be both increased and decreased

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substances applied to objects to reduce friction between them

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Friction can be both helpful and harmful

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As soon as motion occurs, static friction is replaced by kinetic friction

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friction between two objects that does not cause motion

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friction between two moving objects

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The rougher a surface is, the greater the friction

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Rougher surfaces have more microscopic hills than smooth surfaces

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a force that opposes motion between two objects in contact

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Unbalanced forces cause motion

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When the net force on an object does not equal zero, the forces are unbalanced

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When the net force on an object is zero, the forces are balanced

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When forces are balanced, there is no motion

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Just because a force acts upon an object doesn't mean that motion will occur

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combination of all forces

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SI unit of force

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a push or a pull

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final velocity subtracted by the starting velocity divided by the time it took to change velocity

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total distance divided by total time

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rate at which velocity changed

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speed of an object in a particular direction

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distance traveled divided by time taken to travel

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an object that appears to move relative to a reference point