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:
“Sometimes we sailed as gently and steadily as the clouds overhead, watching the receding shores and the motions of our sail; the play of its pulse so like our own lives, so thin and yet so full of life, so noiseless when it labored hardest, so noisy and impatient when least effective; now bending to some generous impulse of the breeze, and then fluttering and flapping with a kind of human suspense.”
—Henry David Thoreau (1817–1862)
“If you are to reach masses of people in this world, you must do it by a sign language. Whether your vehicle be commerce, literature, or politics, you can do nothing but raise signals, and make motions to the people.”
—John Jay Chapman (1862–1933)
“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)