This picture refers to the concepts of a torque. A torque is what forces rotation. The doorstop has a maximum amount of force, therefore that cannont be changed. However, you can change the distance. As you go further from the hinge you get a larger torque. this is because torque=(force)(lever arm) lever arm=the distance from the axis rotation. The concept of rotational inertia also applies to this concept. when there is more mass closser to the axis of rotation the object is difficult to spin, because there is more rotational inertia. Therefore by the doorstop being further away from the axis of rotation it is harder to spin becasue there is more rotational inertia.
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