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15 Cards in this Set

  • Front
  • Back
a push or a pull
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
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)
a force that pulls objects toward each other
a measure of the amount of matter in an object
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