Introduction to Technology

Chapter 22: Transportation Systems

Chapter Summaries

Section 22.1
About half of all the world’s automobiles are used in the United States. The car’s transmission contains gears for transferring power. Buses are an important part of mass transportation. Some larger trucks use deflectors to reduce air resistance. A train that floats using magnetism over a guideway is called a “maglev.”

Section 22.2
There are about 24,000 large deep-water vessels in the world. Displacement is the measure of how much water a vessel moves aside as it floats. Intermodal transportation combines several different kinds of transportation. Cargo is often placed in containers for efficiency.

Section 22.3
Jet airplanes servicing smaller airports do not need a long runway and use less fuel. Helicopters can carry cargo, and some can easily lift ten tons. The force that allows a plane to rise in the air is called “lift.” During missions, space shuttles orbit about 115 miles above the earth.