domingo, 22 de agosto de 2010

Forces and Newton`s first law

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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