In my previous post on the Black Arrow from The Hobbit, I looked at the speed of some real arrows shot in my backyard. Oh, in case you didn't read that post, the arrow shot in the movie version of ...

Energy transferred and work done are both measured in joules (J).

\( Kinetic \ energy = \frac{1}{2} \times mass \times velocity^{2}\) ...

A long time ago a formula was devised for calculating kinetic energy, the energy needed to move a body from one place to another. This energy (E) was dependent on both the mass (M) of the body and the ...