If you want to use the phrase " negative acceleration ", that's fine too, although a bit formal for common usage, for my taste.
12.
Now, you could refer to zero acceleration or zero deceleration to mean the object is not accelerating at all, and you could even refer to negative acceleration, or even negative deceleration, if you must.
13.
Some incorrectly ported games or game engines have acceleration and interpolation curves which unintentionally produce excessive, irregular, or even negative acceleration when used with a mouse instead of their native platform's non-mouse default input device.
14.
In the next seven seconds the negative acceleration continued to increase at a slower rate, with several fluctuations, to a mean value of about-2.8G, the jet began diving towards the ground with increasing rapidity.
15.
These included a free-coast experiment to observe and control the negative acceleration of the fuel caused by the small amount of aerodynamic drag on the vehicle; a rapid fuel tank depressurization test; and a closed fuel tank pressurization test.
16.
Broadly speaking, Bremsstrahlung or " braking radiation " is any radiation produced due to the deceleration ( negative acceleration ) of a charged particle, which includes synchrotron radiation, cyclotron radiation, and the emission of electrons and positrons during beta decay.
17.
We now had the answer for our pilots who were being outmaneuvered and unable to escape a pursuing Zero : Go into a vertical power dive, using negative acceleration if possible to open the range while the Zero's engine was stopped by the acceleration.
18.
Where I disagreed with Philc is that, if an object is known to be slowing down, I would ALWAYS say it is undergoing negative acceleration ( or deceleration ), I would NEVER just say it is accelerating, as that is bound to cause confusion to those who are using the ENGLISH meaning of the word ( which will be many of the readers here ).
19.
Similar with a perpetual-motion machine : especially when there is a readily available source of energy, such as a heat differential ( at different water depths ), a current moving against the bottom of a river, wind moving against a surface, large amounts of light that can be harnessed via the photovoltaic effect, natural motions of the earth or moon, negative acceleration that is already in use to bring vehicles to a stand-still in traffic, and so forth.
20.
SCIENCE borrows words from ENGLISH . ENGLISH doesn't borrow words from SCIENCE . The English language is the origin of the word ACCELERATE . In the English language, ACCELERATE is defined by an INCREASE in velocity, and by an INCREASE ONLY . Scientists, for GOOD REASON, have chosen to DISTORT the TRUE meaning of the term ACCELERATE . That's how scientists have invented the counterintuitive notion of NEGATIVE ACCELERATION . It's all ok, but if you don't recognize that it's the SCIENTIST'S who are distorting the word, you're not giving due respect to its ORIGINAL English language meaning.
