Within a certain specific, though limited range of key travel, i.e. Most piano-style music keyboards are approximately velocity-sensitive, Simply put, velocity is change in position per unit of time. The average velocity ( v) of an object moving through a displacement ( ) in a straight line during a time interval ( ) is described by the formula: The scalar absolute value ( magnitude) of velocity is speed.įor example, "5 metres per second" is a speed and not a vector, whereas In the SI (metric) system, it is measured in meters per second (m/s). It is a vector physical quantity, both speed and direction are required to define it. The position vector directs from the reference point to the presentĪ sensor is said to be displacement-sensitive when it responds to absolute position.įor example, whereas a dynamic microphone is a velocity receiver (responds to the derivative of sound pressure or position), a carbon microphone is a displacement receiver in the sense that it responds to sound pressure or diaphragm position itself.ġst derivative is velocity Velocity is defined as the rate of change of position or the rate of displacement.
That specifies the change in position of a point, particle, or object. These derivatives of position and their corresponding names and special significance are as follows: (first derivative is called velocity, second derivative is calledĪcceleration, etc.), up to the eighth derivative and down to the -5th There are special names for the derivatives of position This article has been tagged since September 2007.Īnd its various derivatives define an ordered hierarchy of meaningfulĬoncepts. Please help Wikipedia by adding references.