If the flat spot is very large ( as in the picture ), strands of molten metal may have got stuck on one side of the flat spot, making it impossible for the wheel to turn due to insufficient clearance between the rolling surface and the brake block.
22.
Adverse yaw created by the rolling surfaces ( ailerons, differential horizontal tails, etc . ) of such aircraft is often more effective in arresting the spin rotation than the rudder ( s ), which usually become blanked by the wing and fuselage due to the geometric arrangement of fighters.
23.
Freight cars ( and some passenger cars like multiple-unit cars whose traction motors do not yield room on axles to allow the placement of disk brakes ) are equipped with " clasp brakes " which directly grab the rolling surface of the wheels ( much like the old horse buggy brakes of yesteryear ).
24.
Any point in the rolling object farther from the axis than the point of contact will temporarily move opposite to the direction of the overall motion when it is below the level of the rolling surface ( for example, any point in the part of the flange of a train wheel that is below the rail ).
25.
By definition, there is no sliding when the instantaneous velocity of the rolling object in all the points in which it contacts the surface is the same as that of the surface; in particular, for a reference plane in which the rolling surface is at rest, the instantaneous velocity of the point of contact of the rolling object is zero.
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