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### 15 Cards in this Set

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