force: a push or pull exerted by one object or another
Friction: a force that opposes the motion of an object in contact with a surface
drag force: a force that opposes the motion of an object through a liquid or gas
gravity: a force of attraction that exists with all objects with mass
net force: the combined effect of all the forces acting on an object
balanced forces: forces that cancel each other out when acting together on an single object
unbalanced forces: forces that do not cancel each other out when acting together on a single javascript:void(0)object
inertia: the tendency of an object to oppose a change in motion
momentum: the mass of an object multiplied by its mass
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