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
A wedge, a lever, and a wheel and axle are types of simple machines, but a block and tackle is a complex machine because it is a combination of simple machines. A block and tackle is made from a rope or cable threaded between two or more pulleys.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 >
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 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 >