Add up the weights of everyone in the room, estimate the rest of the live load, then total everything up. Moving Experiences Because the wind blows and the earth moves, buildings have to be designed so they won't fall under these forces. Repeat the experiment using sandpaper as a surface. The roughness of the sandpaper will create friction. The force from the friction reacts against the wind force, preventing the building from moving.
Winds also create suction.
When you blow on one broad side of the box, the threads will flatten against it. If a building isn't properly designed, the wind can blow windows in on one side, and suck them out of the other. The force of the wind causes buildings to act like an upside-down pendulum, swinging from side to side. Have each student create a pendulum by attaching a weight to the end of a three-foot long string. The time it takes for the pendulum to swing from one side to the other and back is called the period.