Can someone tell me the energy transformation in a pulley and a wedge?

I missed a class of science and now I am stuck. My assignments due tonight, so i need answers quick...Sry 4 being so demanding.Please answer simply as

I missed a class of science and now I am stuck. My assignments due tonight, so i need answers quick...

Sry 4 being so demanding.

Please answer simply as I am in grade 6

or:I missed a class of science and now I am stuck. My assignments due tonight, so i need answers quick...Sry 4 being so demanding.Please answer simply as I am in grade 6


or:Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a wavelength of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity.

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