Amanda Knapp
Basketball is a team sport that was invented in 1891 by Canadian-American gym teacher James Naismith in Springfield, Massachusetts. Two teams of five players each compete with the primary objective of shooting a basketball through the defender's hoop (a basket 18 inches in diameter mounted 10 feet high to a backboard at each end of the court) while preventing the opposing team from doing the same. The game involves dribbling, passing, and shooting, all of which are informed by physics, math, and the laws of motion. The basketball itself has undergone changes over time, with the addition of bumps to the surface to increase friction and make it easier for players to handle.
| Characteristics | Values |
|---|---|
| Sport type | Team sport |
| Number of players | 5 players per team |
| Court shape | Rectangular |
| Objective | Score points by putting the ball inside the hoop (basket) and prevent the opposing team from doing the same |
| Ball diameter | 9.4 inches (24 cm) |
| Basket diameter | 18 inches (46 cm) |
| Basket height | 10 feet (3.05 m) |
| Backboard dimensions | 6 by 3.5 feet (1.8 by 1.1 meters) |
| Free-throw line outer diameter | 3.6 m |
| Free-throw circle diameter | 3.6 m |
| Game duration | 4 quarters of 10 minutes each |
| Overtime | If the score is tied at the end of regulation play, an additional period of play (overtime) is added |
| Foul | Timed play stops and the player fouled or designated to shoot a technical foul is given one, two, or three one-point free throws |
| Double dribble | Dribbling the ball with both hands on the ball or picking up the dribble and dribbling again |
| Ball movement | Passing or dribbling |
| Ball composition | Hollow with an inflatable inner rubber bladder, wrapped in fiber layers, and covered in leather |
| Ball color | Usually bright orange |
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What You'll Learn
Basketball history and invention
Basketball was invented in December 1891 in Springfield, Massachusetts, by James Naismith, a Canadian-American physical education instructor at the International Young Men's Christian Association (YMCA) Training School, now known as Springfield College. The game was created as an indoor sport to keep athletes active during the cold winter months and to provide a less injury-prone sport than football.
Naismith was tasked with creating a new game by his supervisor, Luther Halsey Gulick, who was the College's first physical education director. Naismith remembered a rock-tossing game from his childhood and came up with the idea of a game where players threw a ball at a target. He published 13 rules for this new game, which he called "basket ball." The equipment consisted of two peach baskets and a soccer ball. The first game was played on December 21, 1891, with nine players on each team, and thus, the sport of basketball was born.
Basketball quickly gained popularity, first within the college and then spreading to other colleges and YMCAs. Within a few years, basketball had become a collegiate sport, and by 1905, it was officially recognized as a permanent winter sport. The original rules were printed in a college magazine and distributed to YMCAs across the country, aiding in the sport's spread. High schools also began adopting the game, and teams began to form at various educational levels.
As basketball grew in popularity, rules began to evolve, and the game started to take on a more standardized form. By 1915, the colleges, Amateur Athletic Union, and YMCA formed the Joint Rules Committee to establish uniformity in the rules. The sport continued to spread internationally, with Canada, France, England, Australia, China, and India among the first countries to adopt the game. In 1936, basketball became an Olympic sport, further cementing its global reach. The formation of the National Basketball Association (NBA) in 1946 in the US and the growth of professional leagues internationally solidified basketball's cultural and sporting significance.
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Rules and scoring
Basketball is played by two teams of five players each on a rectangular court. The objective is to score points by shooting a ball through a hoop, or basket, that is mounted on a board at each end of the court. The basket is an elevated horizontal hoop and net, positioned 10 feet above the ground.
There are a number of rules that govern the game of basketball, with the objective of these rules being to create a fair playing field for both teams. The rules also ensure that the game flows and that there is a clear winner at the end. The rules of basketball can vary depending on the level of play and location, with professional rules differing from college rules, for example. However, the majority of rules are consistent and can be applied to most games.
The team with the ball is called the offense, and the team without the ball is the defense. The offense must try to advance the ball down the court toward the basket by passing it to teammates or dribbling, which is bouncing the ball while walking or running. When dribbling, a player must use one hand to bounce the ball and is only allowed to move both feet if both hands are not touching the ball. If a player dribbles with both hands or their hand touches the bottom of the ball, this is called carrying the ball, and the player will lose possession. The offense must also be mindful of the mid-court line; if they put the ball into play behind this line, they have ten seconds to get the ball over the line. If they do not, the defense will gain possession. Once the offensive team gets the ball over the mid-court line, it can no longer have possession of the ball in the area behind the mid-court line.
The defense attempts to stop the offense from scoring by stealing the ball, contesting shots, deflecting passes, and rebounding. A foul is described as gaining an unfair advantage through physical contact. If a player is fouled while shooting, they are awarded free throws. The number of free throws awarded depends on whether the player makes the shot and whether it is a two- or three-point shot. If the team committing the foul has seven or more fouls in the game, then the player who was fouled is awarded one free throw. If they make this shot, they are awarded another free throw.
A field goal, or basket, is worth two points if made from within the three-point line, and three points if made from outside this line. The team with the most points at the end of the game wins. If the score is tied when regulation play expires, an additional period of play, called overtime, is added.
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Court dimensions and markings
The dimensions of a basketball court vary according to the level and type of basketball being played. For instance, a professional NBA court measures 94 feet by 50 feet (28.65 metres by 15.24 metres), while an International Basketball (FIBA) court is slightly smaller at 28 metres by 15 metres (91.9 feet by 49.2 feet). High school and junior high courts are typically 84 feet by 50 feet (25.6 metres by 15.24 metres). The UK playing area for a basketball court is 91.8 feet (28 metres) in length and 49.21 feet (15 metres) in width, with a minimum length and width of 85.3 feet (26 metres) and 45.93 feet (14 metres).
The markings on a basketball court are also subject to variation, depending on the governing body regulating the games. However, certain foundational components are common to most courts. These include the baskets, the three-point arcs, free-throw (or foul) lines, and the half-court line. The three-point arc, for example, is found at both ends of the court, and a basket made from behind this arc is worth three points, while a basket made from within the arc or with a player's foot touching the line is worth two points. The free-throw line, located within the three-point arc, is where players stand when taking a foul shot. A successful foul shot is worth one point, but if a shot is made from the foul line during regular play, it is worth two points. The distance from the free-throw line to the basket varies depending on the league and level of play. In the NBA, this distance is typically 15 feet (4.57 metres).
The centre circle, sometimes called the "jump circle", is marked in the middle of the court and is used for the tip-off at the start of each game. In the NBA, this circle has a diameter of 12 feet (3.66 metres). The key, also referred to as "the paint" or "the lane", is the rectangle below each basket. In the NBA, the key is 16 feet wide (4.88 metres) and 19 feet long (5.8 metres). The restricted area, within the key, is marked by an arc to prevent defensive players from drawing fouls by standing near the basket. The backboard line markings should be 50mm in width and either black or white, depending on the material of the board. The basketball goal or hoop is usually 18 inches (45.72cm) in diameter and positioned 10 feet (3.05 metres) from the floor.
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Basketball science and physics
Basketball is a team sport played with two teams of five players each. The objective of the game is to shoot a basketball through a hoop mounted at a height of 10 feet (3.05 meters) at each end of the rectangular court. The game involves dribbling, passing, and shooting the ball, all of which are governed by the laws of physics and motion.
The basketball used in the game has undergone changes since its invention in 1891 by James Naismith. Initially, soccer balls were used, but players faced challenges in dribbling and passing due to their slippery and less bouncy nature. To address this, the basketball was made bigger, and bumps were added to its surface. These bumps create friction between the ball and the player's hands, making it easier to handle and control. The ball is hollow with an inflatable inner rubber bladder, allowing for air pressure control through a small opening. This air pressure, along with gravity, is responsible for the ball's bounce, which is essential for dribbling effectively.
Dribbling, a fundamental skill in basketball, involves applying Newton's three laws of motion. When a player dribbles, they push the ball downward with their hand while gravity also pulls it toward the ground (Law #1). As the ball falls, it accelerates (Law #2). When it hits the ground, the ball momentarily compresses the air inside, pushing back up into the player's hand (Law #3). The force applied at the beginning of the dribble and the surface being dribbled on influence the height of the bounce.
Shooting the ball also involves physics, particularly the compensation for gravity. With the basket positioned 10 feet high, players must apply an upward force to the ball, which follows a parabolic arc as gravity pulls it back down. This interplay between the applied force and gravity is crucial for making successful shots.
Additionally, the design of the basketball court and equipment incorporates physics and geometry. The standard surface for indoor basketball courts is maple wood due to its high density and shock resistance, which enhances bouncing and safety for jumping athletes. The basket, with its steel rim and attached net, is positioned at a specific height to ensure fair competition. The net momentarily checks the ball as it passes through, aiding visual confirmation of a successful shot and reducing rebound distance.
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Fouls and technicals
Fouls
Fouls are penalties for infractions and can be common, flagrant, or technical. Common fouls are the most frequent and are usually due to illegal contact. They can be offensive or defensive but are most often called on the defence. For instance, a defender blocking their opponent's path without first establishing a legal guarding position is a common foul.
Flagrant fouls, on the other hand, are more serious but less common. They are deemed unnecessary or excessive by the referee and often involve contact likely to cause injury, such as swinging an elbow at an opponent's face.
Technical Fouls
Technical fouls, often called "T" or "tech," are infractions that do not involve physical contact during play. They are typically called for unsportsmanlike behaviour or procedural violations. Technical fouls can be assessed against players, coaches, bench personnel, the entire team, or even the crowd.
Some examples of technical fouls include unsportsmanlike conduct, such as taunting an opponent or acting disrespectfully towards an official. Other technical fouls include kicking or striking the basketball with the foot, hanging on the rim after a dunk (without a safety reason), and uniform or equipment violations.
In the NBA, a technical foul for defensive 3 seconds is assessed if a defensive player guards in the lane for 3 seconds without being within arm's length of an offensive player. Additionally, the home team can receive a technical foul if they play artificial noise during live play or if their crowd commits dangerous offences, such as throwing objects on the court.
The penalties for technical fouls vary depending on the level of basketball. In the NBA, unsportsmanlike technical fouls result in two free throws and possession of the basketball for the opposing team. Additionally, players and coaches can be fined and suspended for accumulating multiple technical fouls throughout the season.
In college basketball, technical fouls are classified as Class A and Class B. Two Class A techs result in an ejection, while a player is not ejected until they receive three Class B technicals, which are less severe and typically don't involve contact with the opponent.
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Frequently asked questions
Basketball is a team sport played between two teams, each with five players. The objective is to score points by putting the ball inside the hoop (basket) and to prevent the opposing team from doing the same. The team with the most points at the end of the game wins.
A field goal is worth two points, unless made from behind the three-point line, when it is worth three. Points can also be accumulated through free throws, which are worth one point each. Free throws are awarded to a team when the opposition team fouls.
The objective of rebounding is to successfully gain possession of the basketball after a missed field goal or free throw. There are two categories of rebounds: offensive rebounds, in which the ball is recovered by the offensive side and does not change possession, and defensive rebounds, in which the defending team gains possession of the loose ball.
Dribbling is bouncing the ball on the ground. When you dribble, you and gravity both apply force on the ball, which accelerates toward the ground with the force of gravity. After the ball hits the ground, an equal but opposite amount of force acts on the ball, forcing it back up into your hand. The more force applied to the ball at the beginning of the dribble, the higher the bounce.
Modern basketballs are hollow with an inflatable inner rubber bladder and have a small opening that lets you control the air pressure. This hollow centre is generally wrapped in layers of fibre and finally covered with leather, which is usually bright orange so players can easily see them.
