Heat and the conservation of energy
Movement gets less ordered and smaller-scale over time
One of the general principles about moving systems is that the movement tends to get less ordered and smaller-scale over time.
Animation zooming in to a bulb filament to show the atoms vibrating more because of the moving electrons.GCSE Maths exam soon?
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Imagine a car crashing into a wall. The large-scale movement of the car is quickly changed into smaller-scale vibrations in the metal, flying fragments of brick and ultimately the increased movement of the particles that the car and wall are made from. We can think of heat as the random movement of particles. So the movement energy of the car is converted into heat energy of the car and the wall.