Here's why:
* Force: A force is a push or pull that can cause a change in motion.
* Net Force: The net force is the overall force acting on an object. It's calculated by adding up all the individual forces, considering their directions.
* Equilibrium: When the net force on an object is zero, the object is in equilibrium. This means there is no acceleration, and the object will either remain at rest or continue moving at a constant velocity.
Examples:
* A book resting on a table: The force of gravity pulling the book down is balanced by the normal force from the table pushing the book up.
* A car traveling at a constant speed: The force of the engine pushing the car forward is balanced by the force of friction and air resistance acting against it.
Important Note: Equilibrium doesn't necessarily mean the object is stationary. It can be moving at a constant velocity.
