Melting is a process that causes a substance to change from a solid to a liquid. Melting occurs when the molecules of a solid speed up enough that the motion overcomes the attractions so that the molecules can move past each other as a liquid.
The Purpose of Work. âWe work to have leisure, on which happiness depends.â So said Aristotle, quoted by Notre Dame philosopher Gary Gutting to explain âWhat Work Is Forâ in a recent article for The New York Times. Luther countered this medieval view of workâwhich is coming back into style in our consumerist cultureâwith his doctrine of vocation.
Because work is defined as force acting on an object in the direction of motion, a machine makes work easier to perform by accomplishing one or more of the following functions: 1  transferring a force from one place to another, 2  changing the direction of a force, 3  increasing the magnitude of a force, or. 4  increasing the distance or speed of a force.