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 is a technique used to gain unauthorized access to computers, whereby the intruder sends a message to a computer with an IP address indicating that the message is coming from a trusted port.
It is also called session hijacking. Session hijacking is a security attack, carried out by an intruder, which attempts to insert commands into an active login session. The most common method of session hijacking is IP spoofing. In an IP spoofing, attacker uses source-routed IP packets that inserts commands into an active transmission between two nodes on a network.