Grindstone and Mechanical energy

Grindstone noun - A revolving stone shaped like a disk; used to grind or sharpen or polish edge tools.

Mechanical energy and grindstone are semantically related. In some cases you can use "Mechanical energy" instead a noun "Grindstone".

Mechanical energy noun - Energy in a mechanical form.

Grindstone and mechanical energy are semantically related. Sometimes you can use "Grindstone" instead a noun phrase "Mechanical energy".