1001 Space Earth Nature History Human World Science and Technology Chemistry Materials Force and Energy Heat and Light Electricity and Magnetism Industry Machines Electronics and Computers Cars and Trucks Railways Ships Aircraft Fishing and Agriculture Undersea Exploration

Choose a Page:How did people pump water in ancie...How does a robot arm work?What is the simplest machine?What is a crawler-transporter used...How does a steam locomotive work?Which were the first machines not ...How did early gramophones work?Who invented the motorcar engine?When was the first bicycle made?What are lasers used for?Who invented the jet aeroplane?How do a bicycle's gears work?*Is it possible to make a perpetual...*How does a roller coaster work? Is it possible to make a perpetual-motion machine? No! A perpetual-motion machine would go on forever without needing energy. But machines have moving parts, which cause friction. Without extra energy to overcome friction, all machines eventually come to a halt. All machines eventually come to a halt!   Previous: Back Book: 1001 Section: Science and Technology Chapter: Machines