Description: A motet for Christmas Day from Selectae quaedam cantiones sacrae, Nuremberg, 1571. Published as the pendant second part of the motet Hodie Christus natus est, this edition is offered as an independent piece.
The universe is made up of matter and energy. Matter â anything that has mass and takes up space â is pretty straightforward and easy to grasp, but energy is a bit more abstract. In physics, energy is the ability to do work, or the ability to move or elicit change in matter.
Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion. In Newtonian (classical) mechanics, which describes macroscopic objects moving at a small fraction of the speed of light, the kinetic energy (E) of a massive body in motion can be calculated as half its mass (m) times the square of its velocity (v): E = Â½mv 2.