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This diagram is showing if you release the ball at a 52º angle the ball will gradually fall perfectly into the basketball due to gravity. If the angle was less than 52º then when you shoot the ball it wouldn't hit the rim. If the angle of the shoot was more than 52º then the ball would hit to back of the rim or backboard.
Physics in Shooting the Ball
When you are shooting the basketball physics are involved. When you release the ball your speed (from wrist, arm, and legs) is determined by how much force you apply. The amount of force is determined by your distance from the basket. The harder you push off the ground the higher you jump and the more force that can be applied to the ball. More force (speed) is necessary for longer shots.
When you shoot a two foot shot your arm release angle would be greater than your arm release angle at the three point line. To have a good shoot, you will need nice arc. The higher arc requires more force at the time of release to propel the basketball higher, which makes it more difficult to control the shot. The shot will also no longer be a "soft shot" because gravity increases the speed of the ball as it falls. When the ball falls 0.1 second through the air, its speed increases. The faster the ball is falling, the greater the collision is with the rim.
When the ball is released from your hand it has backspin (friction). The ball has kinetic energy as it come into contact with the backboard. When the ball reaches the backboard it will have a force of friction making the ball go downwards.
When you shoot a two foot shot your arm release angle would be greater than your arm release angle at the three point line. To have a good shoot, you will need nice arc. The higher arc requires more force at the time of release to propel the basketball higher, which makes it more difficult to control the shot. The shot will also no longer be a "soft shot" because gravity increases the speed of the ball as it falls. When the ball falls 0.1 second through the air, its speed increases. The faster the ball is falling, the greater the collision is with the rim.
When the ball is released from your hand it has backspin (friction). The ball has kinetic energy as it come into contact with the backboard. When the ball reaches the backboard it will have a force of friction making the ball go downwards.