How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon. But the world is messier than a textbook. Scientists in the Harvard John A.

How gravity causes a perfectly spherical ball to roll down an inclined plane is part of elementary school physics canon. But the world is messier than a textbook. Scientists in the Harvard John A.

(A1) Asymmetric driving principle PMP and its normal force analysis. (A2) Force and motion analysis of the PMP. (B1) Schematic diagram of the rack-and-pinion mechanism. (B2) Schematic diagram of the ...

Rolling-ring drives are friction drives that convert the constant rotary motion of a plain shaft into a traversing action that moves an attached carriage. Used in positioning and reciprocating ...

Ship roll motion, characterised by a vessel’s oscillatory movement about its longitudinal axis, remains a central focus in naval architecture and marine engineering. Recent studies have advanced our ...