When the net force acting on an object is 0 N, it means that the forces acting on the object are balanced. This can happen in two scenarios:
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Static Equilibrium: The object is at rest, and the forces acting on it cancel each other out. For example, if a book is resting on a table, the gravitational force pulling it down is balanced by the normal force exerted by the table pushing up.
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Dynamic Equilibrium: The object is in motion with a constant velocity. For example, if a car is cruising at a steady speed on a straight road, the forward force from the engine is balanced by resistive forces such as friction and air resistance.
In both cases, the sum of the forces acting on the object equals zero, leading to a state of equilibrium.