Concurrent Forces vs Non-Concurrent Forces:

Before discussing the answer, let us first understand the difference between concurrent and non-concurrent forces.

- Concurrent Forces: When the lines of action of two or more forces meet at a common point, then these forces are known as concurrent forces.

- Non-Concurrent Forces: When the lines of action of two or more forces do not meet at a common point, then these forces are known as non-concurrent forces.

Explanation:

Now, coming back to the question, it states that the forces which do not cause the rotation are non-concurrent forces. This means that if the lines of action of forces do not pass through a common point, then they cannot cause rotation.

However, this is not the case with concurrent forces, as they can cause rotation. The reason behind this is that when the lines of action of concurrent forces meet at a common point, they create a moment arm, which results in a torque that causes rotation.

For example, consider a wrench used to tighten a bolt. The forces applied by the person's hands on the wrench are concurrent forces, as they meet at a common point (i.e., the center of the bolt). These forces create a moment arm, which results in a torque that causes the bolt to rotate.

Conclusion:

In conclusion, non-concurrent forces do not cause rotation, while concurrent forces can cause rotation due to the moment arm created by their lines of action meeting at a common point.