Is baskball clasified a contact sport?

No - football (soccer) is a contact sport, although it has less contact than American football. Defenders frequently use their body to block/shield the ball, nudge a player off a ball, or tackle (although they must hit the ball, or else it is a foul). Other players might use their opponents body to help them jump higher to head the ball from a corner kick, free kick, or goal kick. -Keep in mind though that on purposely making physical contact for non-sporting reasons, not going for the ball, or too severe may result in a foul and beyond (expulsion from the game), such as a red card.