... skyscrapers There are four stages in the construction of a new building In the first stage, the ground is prepared and the foundation is laid Next, workers build the frame of the building Then the frame ... building Let’s see some of the machines we might find on a construction site The can opener is a complex machine Construction Site Construction of new buildings is a common sight People build new ... force Others change the direction of the force you use Simple machines include the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw The lever is a long bar...