Physics for Kids. 1  Work is a scalar quantity, not a vector quantity. This means that, unlike force and velocity, it has no direction, only a magnitude. 2  Another unit of work is the foot-pound. One foot-pound is equal to 1.35581795 joules. 3  The joule is also used as the standard unit of measure for energy.
IP spoofing (IP address forgery or a host file hijack) IP spoofing, also known as IP address forgery or a host file hijack, is a hijacking technique in which a cracker masquerades as a trusted host to conceal his identity, spoof a Web site, hijack browsers, or gain access to a network.
Caller ID spoofing works in a few ways, the most popular being through VoIP (Voice-over-Internet-Protocol) technology. VoIP is the technology that allows for voice communications to be sent over an Internet connection rather than through a phone line or cell tower.