The resultant force is the single force that has the same effect as all the individual forces acting on an object. In equilibrium, the resultant force is zero. This means that the object is not accelerating and is either at rest or moving at a constant velocity.
Here's a breakdown of the relationship:
- Resultant Force: The sum of all forces acting on an object. It determines the object's acceleration.
- Equilibrium: A state where the resultant force is zero. This means the object is not accelerating.
- Zero Resultant Force: In equilibrium, all forces acting on an object cancel each other out. This results in no net force, leading to no acceleration.
Examples:
- A book resting on a table: The book experiences a downward force due to gravity and an upward force from the table. These forces are equal and opposite, resulting in a zero resultant force. Therefore, the book remains at rest.
- A car moving at a constant speed: The car experiences forces like engine thrust, air resistance, and friction. If these forces balance each other out, the resultant force is zero, and the car continues moving at a constant speed.
In summary, the resultant force is directly related to the forces in equilibrium. When the forces are in equilibrium, the resultant force is zero, leading to no acceleration.
