One of the first bits of science people studied, magnetism is still just as relevant today in everything from electric cars to body scans at the hospital. Gears Wheels with teeth carved around them can make you go faster or bump up your power—and here's how. ...
Photo: A typical pump impeller. Photo courtesy of NASA Marshall Image Gallery.Gear pumpsIn another design, called a gear pump, the vanes and impellers are replaced by two or more large screws or gears that mesh and rotate in opposite directions, pulling fluid around them as they go....
Question: Explain whether or not a mechanical advantage of a simple machine can be less than 1. Mechanical Advantage: Mechanical advantage is used to define the mechanical efficiency of a simple machine. It is basically the ratio of movement of resistance force and the applied...
[C](informal, especiallyAmE)the control stick of a plane [C](informal, especiallyAmE)a handle used to change the GEARS of a vehicle for orchestra [C]a BATON, used by the person who CONDUCTS an orchestra criticism [U](BrE, informal)criticism or harsh words:The referee got a lot of sti...
[C](informal, especially AmE)a handle used to change the GEARS of a vehicle for orchestra [C] a BATON, used by the person who CONDUCTS an orchestra criticism [U](BrE, informal)criticism or harsh words:The referee got a lot of stick from the home fans. country areas (the sticks)...
Pulleys are examples of what scientists callsimple machines. That doesn't mean they're packed withenginesandgears; it just means they help us multiply forces. If you want to lift a really heavy weight, there's only so much force your muscles can supply, even if you are the world's stro...
Today, most cars have two or three different types of braking systems: disc, drum, and handbrakes.Disc brakesPeer through the hubcap of a car's front wheels and you can usually see a shiny metal disc just inside. This is called a disc brake. When the driver steps on the brake pedal,...
GearsPhoto: A gear is made from two or more wheels of different sizes with teeth cut into their edges to ensure they "mesh" (turn together without slipping).Gears are wheels with teeth that can either increase the speed of a machine or its force, but not both at the same time. ...
But some of the latest electric cars and electric bicycles work a different way. Instead of having one motor powering all the wheels using gears or chains, they build a motor directly into the hub of each wheel—so the motors and wheels are one and the same thing. That's what we mean...
Quartz watches work in a very different way to pendulum clocks and ordinary watches. They still have gears inside them to count the seconds, minutes, and hours and sweep the hands around the clockface. But the gears are regulated by a tiny crystal of quartz instead of a swinging pendulum ...