What kind of simple machine is grinder?

What kind of energy lights a light bulb? In order for an object to move in uniform circular motion it must be accelerating? How can scientists study the inner structure of an atom? How much TNT was used in atomic bomb testing? How can an egg float on water? Can Light being absorbed makes shadows form? Why are pmos larger than nmos in cmos design? Does steel have a low thermal conductivity? How fast can a cannonball travel? Why does one liquid float on one another? What material does heat travel through best? Which color on the electromagnetic spectrum has the shortest wavelength? When tones are separated by the interverl called they sound very much alike? What would 1 atom of oil look like under a electron microscope? How would an air bubble clinging to the metal object affect the value for its density? What are the two forces act slowing down our bicycle from sloping downhill? Sentence for gravity? What do you call the gravitational attraction between you and the earth? What is the past perfect tense of wind? Why does ac not cool room on other side of house?

What kind of simple machine is grinder?