Defined as the change in velocity over a period of time. Acceleration is a vector quantity and therefore is stated as a quantity with a direction.
a = (v-u)/t (where a, v and u are vectors)
Where (using SI units):
a = acceleration of the body in metres per second per second (ms^-2, or metres per second squared)
v = final velocity of the body in metres per second (ms^-1)
u = initial velocity of the body in metres per second (ms^-1)
t = time period between the initial and final velocity, in seconds (s)
An accelerating body can also be decelerating (ie, negative acceleration) or be at rest. Also, instantaneous acceleration is a bit different.
a = (v-u)/t (where a, v and u are vectors)
Where (using SI units):
a = acceleration of the body in metres per second per second (ms^-2, or metres per second squared)
v = final velocity of the body in metres per second (ms^-1)
u = initial velocity of the body in metres per second (ms^-1)
t = time period between the initial and final velocity, in seconds (s)
An accelerating body can also be decelerating (ie, negative acceleration) or be at rest. Also, instantaneous acceleration is a bit different.
1) A car that is travelling at 2ms^-1 changes its speed to 6ms^-1 over a period of five seconds, and doesn't change direction. During that five seconds, it had an average acceleration of .8ms^-2 in initial direction.
2) A car travelling forwards at 2ms^-1 is suddenly put into reverse and five seconds later it is travelling 2ms^-2 backwards. It's average acceleration is .8ms^-2 backwards (-.8ms^-2 forwards). Note in this example, the car would have been temporarily at rest just when it changes direction. It is still accelerating (in negative direction, ie backwards, ie decelerating) during this period.
2) A car travelling forwards at 2ms^-1 is suddenly put into reverse and five seconds later it is travelling 2ms^-2 backwards. It's average acceleration is .8ms^-2 backwards (-.8ms^-2 forwards). Note in this example, the car would have been temporarily at rest just when it changes direction. It is still accelerating (in negative direction, ie backwards, ie decelerating) during this period.
by White Razor December 24, 2008
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Jason was buzzed last nite and being the life of the party, then the alcolepsy took over and next thing you know, he was snoring & asleep on the couch at the club.
by MasTerofTheMortar&PeStLe April 9, 2009
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An amazing, perfect girl who is always on your mind. Who you want to talk to all the time. She is always funny, beautiful, and kinky. Usually under five foot.
by Blazer-Glassboro April 13, 2011
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by Peteriesille November 22, 2021
Get the Acelya mug.When a automobile begins to accelerate before it is prudent. Most often witnessed at intersections that are controlled by traffic lights when a driver incorrectly assumes that it is his turn to go next.
Driver: Look at that guy raring to go. I'll bet he doesn't know that it's my turn to go next.
<Car in question moves about a foot and then stops abruptly as he realizes his light did not change green>
Passenger: How embarrassing; a classic case of premature acceleration.
<Car in question moves about a foot and then stops abruptly as he realizes his light did not change green>
Passenger: How embarrassing; a classic case of premature acceleration.
by Mit Long February 12, 2010
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