A collision is an isolated event in which two or more moving bodies (colliding bodies) exert forces on each other for a relatively short time.

Although the most common colloquial use of the word "collision" refers to accidents in which two or more objects collide, the scientific use of the word "collision" implies nothing about the magnitude of the forces.

Some examples of physical interactions that scientists would consider collisions:

Some colloquial uses of the word collision are:

Collisions involve forces (there is a change in velocity). The magnitude of the velocity difference at impact is called the closing speed. All collisions conserve momentum. What distinguishes different types of collisions is whether they also conserve kinetic energy.

Specifically, collisions can either be elastic, meaning they conserve both momentum and kinetic energy, or inelastic, meaning they conserve momentum but not kinetic energy. An inelastic collision is sometimes also called a plastic collision.

A “perfectly-inelastic” collision (also called a "perfectly-plastic" collision) is a limiting case of inelastic collision in which the two bodies stick together after impact.

Ferry Corsten, also known under the alias System F, (born 4 December 1973) is a Dutch producer of trance music, in addition to being a DJ and remixer. He also hosts his own weekly radio show, Corsten's Countdown. He routinely plays at events all over the world with crowds in excess of tens of thousands. In 2009 Ferry Corsten ranked #7 on DJ Magazine's annual Top 100 DJ Poll, dropping to #9 and #18 in subsequent years.

Ferry Corsten was born in Rotterdam, Netherlands. He has produced and remixed under many aliases since the release of his first record at the age of sixteen, but he officially started to work as a musician when he was 17 years old. As a teenager he saved money to buy his first keyboard by washing cars, and selling mix tapes to kids in his neighbourhood. He later began to perform live performances with a friend and won his first award "De Grote Prijs van Nederland" at Holland in 1989. He eventually released a record with a couple of friends when he was just sixteen years old and later began releasing self-made productions while he grew up in Rotterdam in the 1990s, producing underground hardcore gabber tracks, later expanding into club-house and trance music. His first single to reach a chart position was "Don't Be Afraid" under the alias Moonman, which was only the start for becoming a composer as well. In 1997 Corsten and his partner Robert Smit established a dance label named Tsunami with the Dutch based dance company Purple Eye Entertainment b.v., this junction made the creation of another label possible; Polar State. Ferry Corsten was studying to become an Electrical Engineer, so he went to the Technical Training School and after that Higher Technical Education.

Shawn Corey Carter (born December 4, 1969), better known by his stage name Jay-Z, is an American rapper, songwriter, record producer, entrepreneur, and occasional actor. He is one of the most financially successful hip hop artists and entrepreneurs in America, having a net worth of over $450 million as of 2011.He has sold approximately 50 million albums worldwide, while receiving fourteen Grammy Awards for his musical work, and numerous additional nominations. He is consistently ranked as one of the greatest rappers of all-time. He was ranked #1 by MTV in their list of The Greatest MCs of All-Time in 2006. Two of his albums, Reasonable Doubt (1996) and The Blueprint (2001) are considered landmarks in the genre with both of them being ranked in Rolling Stone magazine's list of the 500 greatest albums of all time. Blender included the former on their 500 CDs You Must Own Before You Die.

Jay-Z co-owns the 40/40 Club, is part-owner of the NBA's Brooklyn Nets and is also the creator of the line Rocawear. He is the former CEO of Def Jam Recordings, one of the three founders of Roc-A-Fella Records, and the founder of Roc Nation. As an artist, he holds the record for most number one albums by a solo artist on the Billboard 200 with eleven. Jay-Z also has had four number ones on the Billboard Hot 100, one as lead artist.