kg/square millimeter

N/square meter

ksi

ksc

Conservation of mass

Conservation of momentum

Net work done

Conservation of energy

A circle

A cycloid

An involute

A parabola

Surface flatness

Hardness

Surface roughness

Internal voids

Along an involute

Along a straight line

Along the base circle

Along the pitch circle

The path of contact in involute gears is along a straight line.