Friction is the reason humans are able to control where they move or why objects can stay in one place, but it is also the reason we must use force and lose energy to move objects and why many materials wear out and break. The reality of friction allows machines to work, humans to walk and cars to drive. However, friction also means that energy needs to constantly be exerted to move any object.
When two surfaces are in contact, friction stops those surfaces from sliding against each other. All machines make use of friction and without it would have no use. However, friction makes moving large objects extremely difficult and causes surfaces to wear and break. Friction is a physical constraint, but also makes controlled movement and work possible.Learn More
Albert Einstein is famous for his contributions to science, particularly his general and special theories of relativity. He also won the Nobel Prize for discovering the law of the photoelectric effect.Full Answer >
Nuclear fission was discovered in 1938 by two German scientists, Otto Hahn and Fritz Strassmann. In 1939, it was explained theoretically by Lise Meitner and Otto Robert Frisch.Full Answer >
Matter made up of a single kind of atom is referred to as an element. Atoms are defined as the smallest particles of a given element that still express the element's chemical signatures.Full Answer >
Moore's law is an empirical law, meaning that it was derived from observation rather than from general principle and therefore doesn't seem to be driven by a single underlying force. According to Mooreslaw.org, the law was first articulated by Intel co-founder Gordon Moore and states that the number of processing elements that can be fitted onto a chip at a given cost roughly doubles every year.Full Answer >