Otherwise, it'd just bob up and down in one place, according to NASA.
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They bob up and down ever so slightly as the darts zoom past their heads.
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Its calming powers are enhanced by the fixture's ability to rotate and bob up and down.
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The plants bob up and down as guests gather oregano or basil to add to their next meal.
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Furby moves if you try to tickle it, and can dance, bob up and down, and wiggle its ears.
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However, even us short people have necks that don't like to bob up and down or twist in strange directions.
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When Richard Tice, an anti-EU campaigner, delivers his speech students bob up and down, machine-gunning him rebarbative questions.
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The pink and white beads in Schnaika's braids bob up and down on her forehead as she does her exercises.
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It's more like a wood and metal step ladder with a small motor that makes a plank bob up and down.
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Throw it in a pool, and the thing will bob up and down in the water while blasting out your favorite jams.
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Units bob up and down on the screen, numbers clash into numbers, weakness into advantage, and eventually all but one commander resigns.
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A darkened space accessible along a surrounding wooden walkway harbors five unmanned rowboats that gently bob up and down on a dark surface.
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Standing about 65 feet tall and weighing 500 tons, the mastaba will be anchored to one spot but will still bob up and down.
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Positioned on that bureau are two small plaster figures made around 1790 whose removable portrait heads bob up and down, simulating a nodding gesture.
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Particularly when running, all that slack can cause the cable to bob up and down at the side of each cheek or rub against your chin.
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In a video from one of their performances this week, the robots seem to mostly just bob up and down and gyrate slowly on the pole.
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There, in a row of semiprivate booths, she and other women perform for anonymous clients, shedding underwear to mechanically bob up and down before smoked windows.
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Tracking tags bolted to the sharks' fins revealed that males would bob up and down, as many as 120 times per day and to depths reaching 1,400 feet.
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For "Fireflies," he has created a fleet of customized pedicabs — described as "part rickshaw and part kinetic sculpture" — to carry hundreds of colorful paper lanterns that will bob up and down the boulevard.
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A drowning person's head may be low in the water, even below the waterline, and they will tend to bob up and down, gasping for breath, according to the American Academy of Pediatrics (AAP).
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In 2007, the Argo program, an international collaboration meant to standardize ocean observation, was established, comprised of nearly 3,800 submersible robots called "Argo floats" that bob up and down, transmitting climate data via satellite.
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Propel says that it tried to mimic the actual physics of the real craft, and the digital copy does bob up and down convincingly (although it doesn't drift around quite as much as the real McCoy).
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The ultimate solution they came up with looks more like a bouncy castle or giant inflatable mattress set out in front of two robotic arms that bob up and down raising a wire in the wind.
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He and partner Peter Dilworth paraded their project out, showing them off to our cameras one by one, culminating with Flap-Itz, a $10 pair of plastic animal ears that bob up and down, courtesy of a small hydraulic hand pump.
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Most candidates have seen their support bob up and down in a narrow range of a few percentage points, including the polling leader, Joe Biden, often in a predictable surge-and-decline pattern after their decisions to run for president.
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Judging by the way the stars bob up and down like horses on a carousel as they go around the plane of the galaxy, Oort calculated that there ought to be twice as much matter gravitationally propelling them as he could see.
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They bob up and down in the water before swimming out of the scene. Once the couple have gone a man sails out in a boat.
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Cowbirds sometimes parasitise the nest. Pied water tyrants often bob up and down when perched, and have a fluttering “butterfly” display flight. They forage for insects, their staple diet, in low waterside vegetation.
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The sounds caused the lanterns to bob up and down and electric lamps in hues of red, white, and yellow blinked disapprovingly at one another.Informal Opening Of The Madison Square Garden Roof Show, New York Times, May 27, 1892, pg. 4.
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So each oscillation of the weight back and forth causes it to bob up and down more, until all the energy is transferred back from the rotational mode into the translational mode and it is just bobbing up and down, not rotating.
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For promotion of the film, theater lobbies featured a 3-D cut out of the film poster of Riggs and Murtaugh posing with their guns and Leo Getz peeking from the background. On the display, there was a motor which helped Leo's head bob up and down from behind them.
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Around dusk, male imagos congregate in swarms. They often aggregate in the lee of structures such as buildings or trees, or if there is no wind, all round such a structure. Each male occupies a fixed position facing into the wind, about from the next one, stabilizing its position with its cerci. They do not bob up and down as do males of H. limbata.
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Breeding season of black- bellied seedcrackers runs from March to November, peaking in April and September and coincides with rain seasons. It begins with courtship behaviors. Males show off by holding a piece of vegetation in their bill, like a long grass blade, leaf or grass panicle, and bob up and down perched in trees. Simultaneously, they sing to advertise their presence and attract females.
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Platycypha males will hover in front of a female, thrusting their bright white legs forward in front of their heads. Rhinocypha will bob up and down, often low over fast-flowing streams, displaying their bright-coloured bodies and wings. Male members of the family Protoneuridae with vividly coloured wings display these to visiting females. Swift forktail (Ischnura erratica) males display to each other with their blue-tipped abdomens raised.
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The basic shotline has a line fixed to the weight and the float, and does not compensate for depth changes. This is adequate in many circumstances, and has the advantage of simplicity. If there is any current or wind, the buoy will drift until tension in the line prevents further movement. Large waves will cause the buoy and the top end of the line to bob up and down, jerking on the line.
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Even without such systems the habitable surface area would be an equivalent of tens to hundreds of millions of Earths. Because the Sun remains stationary, there is no day/night cycle, only a perpetual twilight. This could be solved by forcing the Sun to bob up and down within the disk, lighting first one side then the other. This essay was first published in Analog magazine (1974), and is also anthologised in Playgrounds of the Mind.
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The pied falconet's breeding season is from March until May. In the early breeding season, the males will initiate interest in mating to a female by presenting leaves to them. The male flies off and returns to a perched female and presents a leaf that he has gathered for the female. Later in the breeding season, usually before copulation, the males will bob up and down very frequently in front of the female while calling frantically.
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A Wilberforce pendulum alternates between two oscillation modes. A Wilberforce pendulum, invented by British physicist Lionel Robert Wilberforce around 1896, consists of a mass suspended by a long helical spring and free to turn on its vertical axis, twisting the spring. It is an example of a coupled mechanical oscillator, often used as a demonstration in physics education. The mass can both bob up and down on the spring, and rotate back and forth about its vertical axis with torsional vibrations.
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Sustained oscillation has two necessary components: an underdamped second- or higher-order system and a positive feedback mechanism. An example of an underdamped second order system is a spring and mass system, where the mass can bob up and down (oscillate) when hanging from a spring. If shimmy cannot be designed out of the system, a device known as a steering damper may be used, which is essentially a notch filter designed to damp the shimmy at its known natural frequency. Shimmy is usually associated with the deformation of (rubber) tires.
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