If the fluid is air, the force is called an aerodynamic force.

If proto-bird courtship displays combined displays of forelimb feathers with energetic jumps, then the transition from display to aerodynamic functions could have been relatively smooth.

If the leading edge of the aileron is sharp or bluntly rounded, that adds significant drag to that wing and help the aircraft to yaw ( turn ) in the desired direction, but adds some unpleasant or potentially dangerous aerodynamic vibration ( flutter ).

If the energy input by the aerodynamic excitation in a cycle is larger than that dissipated by the damping in the system, the amplitude of vibration will increase, resulting in self-exciting oscillation.

If the thrust-to-weight ratio is greater than the local gravity strength ( expressed in gs ), then flight can occur without any forward motion or any aerodynamic lift being required.

If the thrust-to-weight ratio times the lift-to-drag ratio is greater than local gravity then takeoff using aerodynamic lift is possible.

If the design of an automobile conforms to its function, as in its aerodynamic shape or wide stance for better vehicle dynamics, then its form is said to follow its function.

If deceleration is not detected and aquaplaning is suspected, the nose should be raised and aerodynamic drag utilized to decelerate to a point where the brakes do become effective.

If the acting captain wanted his acting lieutenant to sit on his ass around the station all night, Killpath would just have to go out and drag Gun back by the heels once an hour ; ;

If the anchor continues to drag, or sets after having dragged too far, it should be retrieved and moved back to the desired position ( or another location chosen.

If the weight is suspended off the seabed it acts as a spring or shock absorber to dampen the sudden actions that are normally transmitted to the anchor and can cause it to dislodge and drag.

If the fletching is not arranged to induce rotation, it will still improve accuracy by causing a restoring drag any time the arrow tilts away from its intended direction of travel.

If the rider is sitting upright, the rider's body creates about 75 % of the total drag of the bicycle / rider combination.

If the driving member rotates in the direction that would unwind the spring the spring expands minutely and slips although with some drag.

If the aether was dragged by mass then this experiment would have been able to detect the drag caused by the lead, but again the null result was found.

If an orbit is about a planetary body with significant atmosphere, its orbit can decay because of drag.

If an electric boat has sails as well, and will be used in deep water ( deeper than about 15 m or 50 ft ), then a towed generator can help build up battery charge while sailing ( there is no point in trailing such a generator while under electric propulsion as the extra drag from the generator would waste more electricity than it generates ).

If the example were set in the solar system, the drag force, d / dt ( mv < sub > 1 </ sub >), would be about ( 0. 001 kg / s ) ( 500, 000 m / s ), or 500 newton.

If the shaft is too long it will extend farther into the water than necessary creating drag, which will impair performance and fuel economy.

If its leading edge is raked back enough, it will escape the shock wave formed at the nose of the aircraft as transonic speeds are reached, reducing drag considerably, and the center of lift moves less than on conventionally configured aircraft, reducing trim drag.

If the cloud droplets continue to grow past this size, they become too heavy to be held aloft as the gravitational force overcomes the atmospheric drag, and they fall from the cloud as rain.

If they want to score they will have to try and risk an edge to a wide ball and hit through the packed off side, or trying and drag the ball from far outside the stumps to the sparsely-populated leg side.

If the configuration of the pane is symmetrical respect to the XY plane, minimum drag coefficient equals to the parasitic drag of the plane.

If the lynx kills or scavenges a larger animal that it cannot consume all in one sitting, it will drag it to a hiding area such as a bush or under a rock and then will cover the dead animal with leaves and return to consume it later.

If acceleration continues, the train will eventually attain a speed at which the available tractive force of the locomotive ( s ) will exactly offset the total drag, causing acceleration to cease.

If the lanyard clips to the buoyancy compensator, the user should take care to release if there is surface boating activity, as boats may drag divers up by their SMB reels.

In " The Old Main Drag ," a song from The Pogues ' 1985 album Rum, Sodomy, and the Lash, the drug is name-checked: In the cold winter nights, the old town it was chill / But there were boys in the cafes who'd give you cheap pills / If you didn't have the money, you'd cajole or you'd beg / There was always lots of tuinol on the old main drag.

If one considers an isolated particle circling in the upper cylindrical component of the cyclone at a rotational radius of from the cyclone's central axis, the particle is therefore subjected to centrifugal, drag and buoyant forces.

If we ignore the universal downward force of gravity and viscous drag between the particle and the fluid parallel to the velocity, there are two other forces acting on the particle-radial viscous drag and buoyancy.

If not due to maternal hyperglycemia, in most cases it is multifactorial, transient and easily supported.

If the pressure is steady, there is no more stimulus ; thus, typically these neurons respond with a transient depolarization during the initial deformation and again when the pressure is removed, which causes the corpuscle to change shape again.

If changes in external temperatures or internal heat generation changes are too rapid for equilibrium of temperatures in space to take place, then the system never reaches a state of unchanging temperature distribution in time, and the system remains in a transient state.

If this has no effect ( i. e. no evidence of transient AV block ), a 12 mg dose can be given 1 – 2 minutes after the first dose.

If the energy in a transient pulse ( normally measured in joules ) is too high, the device may melt, burn, vaporize, or otherwise be damaged or destroyed.

If the opposite line is de-energized, this voltage transient may trip supply breakers.

If the magnetic field in the plasma is not stationary, either because the plasma as a whole is transient or because the fields are periodic ( radio-frequency heating ), the rate of change of the magnetic field with time (, read " B-dot ") can be measured locally with a loop or coil of wire.

If the change in gene expression is caused by an oligonucleotide binding to an mRNA or temporarily binding to a gene, this results in a temporary change in gene expression without modification of the chromosomal DNA and is referred to as a " transient knockdown ".

If the stationary state of the process is stable, then the unreproducible fluctuations involve local transient decreases of entropy.

Restated, “ because of the brief interval between the transient event and a stroke or blindness from temporal arteritis, the workup for transient monocular blindness should be undertaken without delay .” If the patient has no history of giant cell arteritis, the probability of vision preservation is high ; however, the chance of a stroke reaches that for a hemispheric TIA.

If session information is considered transient, volatile data that is not required for non-repudiation of transactions and doesn't contain data that is subject to compliance auditing ( in the U. S. for example, see the Health Insurance Portability and Accountability Act and the Sarbanes-Oxley Act for examples of two laws that necessitate compliance auditing ) then any method of storing session information can be used.

If stroke or other similar, transient disorders occur ( cerebrovascular accident, or transient ischemic attack, TIA ), then neurological imaging of the affected lobes or hemispheres of the brain can be performed ( CT, MRI, PET, etc.

: 71-80 If symptoms are present, they are transient and expectable reactions to psychosocial stressors ( e. g., difficulty concentrating after family argument ); no more than slight impairment in social, occupational, or school functioning ( e. g., temporarily falling behind in schoolwork ).

If the fault affects the customer's own distribution circuit, they may see one or several brief, complete outages followed by either normal operation ( as the autorecloser succeeds in restoring power after a transient fault has cleared ) or a complete outage of service ( as the autorecloser exhausts its retries ).

If we have a k + 1 state process, where the first k states are transient and the state k + 1 is an absorbing state, then the distribution of time from the start of the process until the absorbing state is reached is phase-type distributed.