A simple machine that has inclined planes on both sides and comes to a point is called what?

A wedge is defined as a simple machine that consists of two inclined planes that are joined together, forming a sharp edge or point. This design allows the wedge to convert a force applied to its blunt end into a force exerted along the sides, effectively being used to separate materials or hold objects in place.

This understanding of a wedge is crucial when comparing it to the other options. A screw, for instance, is an inclined plane wrapped around a cylinder, which functions differently. A block and tackle is a system of pulleys designed to lift or lower heavy objects through a series of ropes and pulleys, which does not have the inclined plane characteristic. Likewise, a pulley itself primarily provides a means for lifting and changing the direction of force but doesn't have the defining shape of a wedge. Thus, the choice of wedge is appropriate based on its structural characteristics and function.