kiirenemine

Kiirenemine is the Estonian term for acceleration, defined as the rate at which an object's velocity changes over time. In physics, kiirenemine a(t) is the derivative of velocity with respect to time. It is a vector quantity, having both magnitude and direction, and is measured in meters per second squared (m/s^2) in the SI system. Constant kiirenemine yields uniform acceleration, described by simple kinematic equations: v = v0 + a t and s = s0 + v0 t + 1/2 a t^2, where v is velocity, s is position, t is time, and a is kiirenemine. Instantaneous kiirenemine at a given moment is the limit of the average acceleration over shorter intervals, and can be derived as a = dv/dt.

In everyday language, kiirenemine is used to describe the act of speeding up a vehicle, like a car or train, or the rise in speed of a rocket engine. It also appears in discussions of growth and change, where the rate of development or production increases over time, sometimes called accelerated growth.

Newton's laws relate kiirenemine to forces: F = m a, where m is mass and F is net force. In rotational motion, angular kiirenemine α is the rate of change of angular velocity ω. Measuring kiirenemine involves accelerometers, radar guns, or motion capture systems.

Etymology: kiirenemine is formed from kiire "fast" with the noun suffix -emine. The term is used in technical contexts as well as in common Estonian language to describe changes in speed or growth rates.