* Equal Size: The forces acting on the object are equal in magnitude (size).
* Opposite Direction: The forces act in opposite directions.
What does this mean in practical terms?
* No Net Force: Because the forces are equal and opposite, they cancel each other out. This means there is no *net* force acting on the object.
* No Acceleration: According to Newton's First Law of Motion, an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by a net force. Since there's no net force, the object's velocity remains constant. This means the object is either stationary or moving at a constant speed in a straight line.
Examples:
* A book sitting 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 person standing still: The force of gravity pulling them down is balanced by the upward force from the ground.
* A car moving at a constant speed: The force of the engine propelling the car forward is balanced by the forces of friction (air resistance and tire friction) acting against it.
