Final answer:
Walls are supported and prevented from tipping by bracing and other structural elements like shear walls that counteract lateral forces and maintain stability.
Step-by-step explanation:
Walls are prevented from tipping as they're being erected and held in position after being plumbed and straightened by various structural supporting elements. One common type of support is known as bracing. In the case of a wall exposed to wind forces, as in the exercise, braces would provide the necessary support to counteract the forces and maintain stability.
When constructing with materials like rammed earth or using techniques such as pier-and-beam, the structures need to account for both the vertical loads and the lateral forces that could cause the walls to pivot at their base or push outwards. In modern construction, other methods such as steel or wooden framing, shear walls, and reinforced concrete can also provide the necessary support to ensure the walls do not fail under applied loads.