The drag force can be used to the electrodynamic system's advantage, however, as it creates a varying force in the rails that can be used as a reactionary system to drive the train, without the need for a separate reaction plate, as in most linear motor systems. Laithwaite led development of such "traverse-flux" systems at his Imperial College laboratory.  Alternatively, propulsion coils on the guideway are used to exert a force on the magnets in the train and make the train move forward. The propulsion coils that exert a force on the train are effectively a linear motor: an alternating current through the coils generates a continuously varying magnetic field that moves forward along the track. The frequency of the alternating current is synchronized to match the speed of the train. The offset between the field exerted by magnets on the train and the applied field creates a force moving the train forward.
With its frame which weighs an eyebrow-raising 195g, the Note 8 is certainly going to make itself felt when you slip it inside a pocket. One-handed use is actually just about manageable however, helped in large part by those absent bezels. Samsung has also chucked in a bunch of bonus modes to help out in this regard, such as the ability to shrink down your desktops and apps with a swipe of the screen or triple-push of the home button. You can also pull out the notifications bar by flicking a fingertip across the rear-mounted fingerprint sensor.