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- In a compressible sound transmission medium - mainly air - air particles get an accelerated motion: the particle acceleration or sound acceleration with the symbol a in metre/second2. In acoustics or physics, acceleration (symbol: a) is defined as the rate of change (or time derivative) of velocity. It is thus a vector quantity with dimension length/time2. In SI units, this is m/s2. To accelerate an object (air particle) is to change its velocity over a period. Acceleration is defined technically as "the rate of change of velocity of an object with respect to time" and is given by the equation where
* a is the acceleration vector
* v is the velocity vector expressed in m/s
* t is time expressed in seconds. This equation gives a the units of m/(s·s), or m/s2 (read as "metres per second per second", or "metres per second squared"). An alternative equation is: where
* is the average acceleration (m/s2)
* is the initial velocity (m/s)
* is the final velocity (m/s)
* is the time interval (s) Transverse acceleration (perpendicular to velocity) causes change in direction. If it is constant in magnitude and changing in direction with the velocity, we get a circular motion. For this centripetal acceleration we have One common unit of acceleration is g-force, one g being the acceleration caused by the gravity of Earth. In classical mechanics, acceleration is related to force and mass (assumed to be constant) by way of Newton's second law: (en)
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- 3816 (xsd:nonNegativeInteger)
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- In a compressible sound transmission medium - mainly air - air particles get an accelerated motion: the particle acceleration or sound acceleration with the symbol a in metre/second2. In acoustics or physics, acceleration (symbol: a) is defined as the rate of change (or time derivative) of velocity. It is thus a vector quantity with dimension length/time2. In SI units, this is m/s2. To accelerate an object (air particle) is to change its velocity over a period. Acceleration is defined technically as "the rate of change of velocity of an object with respect to time" and is given by the equation (en)
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- Particle acceleration (en)
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