force - a push or a pull, normal force - an applied force that is perpendicular to the object, contact force - a force exerted when objects are touching each other, non-contact force - a force exerted at a distance, friction - a contact force that two surfaces exert on each other when they push or rub against each other, gravity - a non-contact force that pulls objects with mass toward each other, magnetism - the attractive or repulsive force exerted by magnetic materials, magnitude - strength or degree, balanced forces - two forces acting on the same object that are equal in strength and opposite in direction, unbalanced forces - two forces acting on the same object that are not equal in strength and opposite in direction, net force - the combination of all the forces acting on an object, Newton’s third law of motion - a law that states if one object exerts a force on another object, then the second object exerts an equal but opposite force on the first object, force pairs - an action force and its corresponding reaction force, as described by Newton’s third law,

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