Joint movement occurs on an axis that is always to its plane

Perpendicular

Explanation:

Joint movement: This is a movement which occurs around an axis that is always perpendicular to its plane. This can also be defined a movement which usually occurs or happens in a plane and around an axis. perpendicular is used to describe the meeting angle which is usually ( 90 degrees) to the ground.

mass and weight are closely related because mass affects the weight of an object experiencing the effects of gravity. weight is the measure of the force of gravity on an objects's mass, while mass is the measure of how much matter there is in an object.

answer///triple meter;