Design a method to separate a mixture of
sugar, sand, and bits of iron.

Magnet, water, coffee filter.

Explanation:

The magnet will pick up the iron filings, and the water will dissolve the sugar and leave the sand. Next add the sand to a coffee filter and squeeze the sugar-water liquid. You have now successfully separated each specimen.  

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy