Consider the following scenario:
When studying forces, we know that when there is an unbalanced force acting on an object (let's say a textbook), the textbook moves in the direction of the unbalanced force. However, in real life, the textbook will move differently if the force is applied on the edge of the textbook versus the center of the textbook.
The force is not applied on an angle; it's applied closer to one edge of the textbook instead of the dead center. The force should move the textbook forward, but instead the book will be pushed forward on the edge only, causing the book to spin.
What concept of forces describes this phenomenon? It can't be a force on an angle because that would still cause the textbook to move in a straight line. I have been trying to research and describe this problem, but I had no success.