Question

question 4
what is equilibrium?
when there are no forces
when all forces acting on an object remain the same
when an object does not move
when the forces acting on an object change

Explanation:

Equilibrium in physics occurs when all forces acting on an object are balanced. This means the net force is zero. If forces remain the same (balanced), the object's state (at rest or in uniform motion) doesn't change. Option 1 is wrong as equilibrium can have forces (just balanced). Option 3 is incorrect as equilibrium can also be when object moves at constant velocity. Option 4 is wrong as changing forces don't imply equilibrium.

Answer:

when all forces acting on an object remain the same