Final answer:
A nail is not a double inclined plane but rather a wedge, a variant of an inclined plane used in simple machines. Inclined planes reduce the effort needed to lift objects, as historically exemplified by pyramid construction.
Step-by-step explanation:
The statement "A nail is an example of a double inclined plane" is false. A nail is not a double inclined plane; it is considered a wedge, which is a modified form of an inclined plane. In contrast, a screw can be viewed as an inclined plane wrapped around a cylinder. Inclined planes and wedges are simple machines that facilitate the lifting of loads or the separating of objects. However, the reduced effort required to lift an object up an inclined plane does not change the amount of work done, assuming friction is negligible as mentioned in the reference to moving blocks of stone up inclined lanes or ramps during the construction of the Egyptian pyramids.