Final answer:
When a wrecking ball hits a tall, unsupported concrete wall near the top, the wall is more likely to fall by rotating at its base due to torque. If hit at the base and well-attached, the wall might break without toppling; otherwise, its reaction depends on the security of the base.
Step-by-step explanation:
If a wrecking ball hits a tall, unsupported concrete wall near the top, the wall is more likely to fall over by rotating at its base, rather than falling straight down. This is due to the principles of torque and leverage. When a force is applied at a high point on the wall, it creates a longer lever arm and a greater torque about the base, which increases the tendency of the wall to rotate around its base and topple over. The higher the point of impact, the larger the torque due to the increased distance from the pivot point at the base, which enhances the rotational effect.
However, if the wrecking ball strikes the wall with the same force at its base, the outcome would depend on how firmly the wall is attached to its base. A well-attached base might resist the force, absorbing the impact and possibly resulting in the wall breaking or crumbling without toppling over. If the wall is not well-secured at the base, it may move or slide upon impact, or it could still topple over, depending on the precise nature of the attachment and the distribution of the wall's mass.