Motions
Motions of a bike can be roughly grouped into those out of the central plane of symmetry: lateral; and those in the central plane of symmetry: longitudinal or vertical. Lateral motions include balancing, leaning, steering, and turning. Motions in the central plane of symmetry include rolling forward, of course, but also stoppies, wheelies, brake diving, and most suspension activation. Motions in these two groups are linearly decoupled, that is they do not interact with each other to the first order. An uncontrolled bike is laterally unstable when stationary and can be laterally self-stable when moving under the right conditions or when controlled by a rider. Conversely, a bike is longitudinally stable when stationary and can be longitudinally unstable when undergoing sufficient acceleration or deceleration.
Read more about this topic: Bicycle And Motorcycle Dynamics
Famous quotes containing the word motions:
“If ever thou shalt love,
In the sweet pangs of it remember me;
For such as I am, all true lovers are,
Unstaid and skittish in all motions else
Save in the constant image of the creature
That is beloved.”
—William Shakespeare (1564–1616)
“A lover, when he is admitted to cards, ought to be solemnly silent, and observe the motions of his mistress. He must laugh when she laughs, sigh when she sighs. In short, he should be the shadow of her mind. A lady, in the presence of her lover, should never want a looking-glass; as a beau, in the presence of his looking-glass, never wants a mistress.”
—Henry Fielding (1707–1754)
“A man whose blood
Is very snow-broth; one who never feels
The wanton stings and motions of the sense,
But doth rebate and blunt his natural edge
With profits of the mind, study, and fast.”
—William Shakespeare (1564–1616)