Which method is used to find the resultant force of two forces that do not act along the same line?

The method used to find the resultant force of two forces that do not act along the same line is the parallelogram of forces. This method is particularly effective for visualizing and calculating the resultant of two forces that are at an angle to each other.

In a parallelogram of forces, the two forces are represented as two adjacent sides of a parallelogram drawn to scale and at the angle between the forces. The diagonal of the parallelogram that stretches from the point of application (where the two forces act) to the opposite corner represents the resultant force. This visual approach makes it easier to understand the combined effect of the two forces acting together.

Using this method provides both the magnitude and direction of the resultant force, making it a comprehensive way to solve problems involving non-collinear forces. Understanding the parallelogram of forces thus equips students with a strong foundational concept in vector addition and the mechanics of forces.