The zipper is a wedge, which is a simple machine that works by putting two inclined planes side by side so that they create a sharp edge. A zipper has two lower wedges that permit it to close and a single upper wedge that allows it to open.Continue Reading
Wedges are used to separate things, either by cutting them or pushing them apart. They also function to hold things in place. Other examples of wedges are an ax, a knife, a fork and a door stop.
The inclined plane decreases the force needed to to raise an object to a certain height. This decrease in force makes it easier to perform work.Learn more about Sewing
A lever is a simple machine that is made up of a board or bar that rests on an object. Levers are used to achieve a mechanical advantage, such as making lifting heavy objects easier.Full Answer >
A simple machine is a manual device that reduces the effort needed to perform a certain amount of work. These mechanisms alter the direction or magnitude of a force to help increase the ability to lift, push and pull objects.Full Answer >
A staircase is an example of the inclined plane simple machine. A spiral staircase, however, is categorized as a screw. Another common example of an incline plane is a ramp.Full Answer >
The force applied to a simple machine is called effort force. The amount of work a simple machine can do is based on effort force multiplied by the distance a machine moves or lifts an object.Full Answer >