You can wrap an inclined plane around a(n) to form a screw. This is a type of simple machine that multiplies . The spiral are the screw's threads. The distance between the threads is called the . The of the head of a screw causes it to move into an object. Screws are held in place by once they are inserted with a tool. Screws are available in all sizes and . Combining two or more simple machines results in a(n) machine. One example is a(n) used to turn a screw. You can measure the amount of useful work this machine does with a quantity called .
