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15 Cards in this Set
- Front
- Back
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force
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a push or a pull
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Newton
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the strength of a force measured in SI units (internal system of units)
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net force
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the combination of all forces acting on an object; the net force determines whether an object moves and also in which direction it moves
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unbalanced forces
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can cause an object to start moving, stop moving, or change direction
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balanced forces
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equal forces acting on one object in opposite directions
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friction
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the force that two surfaces exert on each other when they rub against each other
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static friction
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the friction that acts on objects that are not moving
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sliding friction
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occurs when two solid surfaces slide over each other
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rolling friction
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when an object rolls across a surface, rolling friction occurs (rolling friction is easier to overcome than sliding friction)
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fluid friction
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occurs when an a solid object moves through a fluid (fluid friction is the easiest to overcome)
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gravity
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a force that pulls objects toward each other
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mass
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a measure of the amount of matter in an object
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weight
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the force of gravity on a person or object at the surface of the planet
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free fall
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when the only force acting on an object is gravity
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air resistance
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objects falling through air experience a type of fluid friction
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