# normal acceleration

## normal acceleration

[′nȯr·məl ak‚sel·ə′rā·shən] (mechanics)

The component of the linear acceleration of an aircraft or missile along its normal, or

*Z*, axis.The usual or typical acceleration.

## Normal Acceleration

the component of acceleration for a point in curvilinear motion that is directed along the principal normal to the trajectory toward the center of curvature; normal acceleration is also called centripetal acceleration. It is numerically equal to *v ^{2}/ρ*, where

*v*is the velocity of the point and

*ρ*is the radius of curvature of the trajectory. For circular motion the normal acceleration can be calculated from the formula

*rω*, where

^{2}*r*is the radius of the circle and ω is the angular velocity of rotation of the radius. For rectilinear motion the normal acceleration is zero.

## normal acceleration

**i**. The component of the linear acceleration of an aircraft or missile along its normal, or

*Z*axis. See

*normal axis*.

**ii**. The usual or typical acceleration.