# 18. Physical quantities and units¶

Below is a table showing the units used to express different physical quantities within AGX Dynamics for Unreal.

Quantity

Unit

Acceleration

$$cm/s^2$$

Angle

$$deg$$

Angular velocity

$$deg/s$$

Angular acceleration

$$deg/s^2$$

Cohesion

$$Pa$$

Compliance (rotational)

$$rad/Nm$$

Compliance (translational)

$$m/N$$

Damping (rotational)

$$Nms/rad$$

Damping (translational)

$$Ns/m$$

Density

$$kg/m^3$$

Electric potential

$$V$$

Electric resistance

$$Ohm$$

Force

$$N$$

Length

$$cm$$

Mass

$$kg$$

Moment of inertia

$$kg m^2$$

Pressure

$$Pa$$

Speed

$$cm/s$$

Spook Damping*

$$s$$

Stiffness (rotational)

$$Nm/rad$$

Stiffness (translational)

$$N/m$$

Torque

$$Nm$$

Young’s Modulus

$$Pa$$

Spook damping is the damping used in AGX Dynamics and is the time in seconds a constraint have to fulfill its violation.

Generally, the unit of a certain property can also be seen in the Unreal Editor in the tooltip text. This is displayed by hovering the mouse cursor over the property of interest.