J j J j J j J j J j J j

Jerk

The rate of change of acceleration, relevant to vehicle ride comfort and drivability analysis. See: Ride and Comfort Metrics

The effectiveness of a mechanical joint in transmitting motion or torque without excessive loss. See: Mechanical Power Transmission

A plain bearing supporting a rotating shaft on a thin lubricating film. See: Bearing Types

The SI unit of energy, used in analysing work, heat transfer, and energy storage. See: Automotive Energy Fundamentals

The upward movement of a vehicle suspension relative to the body. See: Suspension Kinematics

The operating temperature at the semiconductor junction of electronic components. See: Automotive Electronics Thermal Limits

The coolant circulating through engine block passages to manage combustion heat. See: Engine Cooling Systems

The calibrated flow characteristics of fuel delivery passages in carburetion systems. See: Carburettor Fundamentals

A temperature sensor using iron and constantan conductors, applicable in engine testing. See: Automotive Sensors

Joint Articulation Angle

The maximum angular displacement permitted by driveline joints without excessive stress. See: Constant Velocity Joints