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.Know More
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
Some ideas for a kid's project for a simple machine are making ramps out of books and blocks, using a pulley to send a snack to a friend and using a ruler to make a lever. Some examples of simple machines are the lever, wheel and axle, inclined plane, wedge, pulley and screw.Full Answer >
A knife is an example of a simple machine called a wedge. A wedge is made up of two inclined planes placed back to back to form a sharp edge. When the edge is placed between two objects and force is applied, the wedge drives the objects apart.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 gear is a special type of lever, and is therefore considered a simple machine. The reason a gear is like a lever is due to the teeth in the gear. Each tooth exerts pressure on another, causing the gear to move.Full Answer >