2006-09-08 02:52:54 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
No such thing as negative acceleration. Acceleration is a change in velocity. So no matter if you're going slower, faster, forward, or backwards... as long as your speed is changing, you are accelerating.
2006-09-08 03:00:04 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Technically speaking, acceleration is a vector---it is the time derivative of the velocity vector. It has a positive magnitude and a direction.
When you say "negative acceleration", you are making an approximation that the system under consideration is 1-dimensional, and that one direction is "positive" and the other is "negative". If you keep track of the signs correctly, no vectors are needed.
In the case of a car, the forward direction is positive and the backward direction is negative. In that case, you have "negative acceleration" when:
1) the transmission is in "reverse" and you step on the gas,
2) the car is moving forward, and you step on the brake.
Since you do these things while entering and leaving a garage, you have some negative acceleration in both cases.
2006-09-14 04:26:23 · answer #2 · answered by cosmo 7 · 0⤊ 0⤋
When leaving garage it is moving forward so has positive acceleration..when entering it is coming to a stop so has negative acceleration
2006-09-08 03:38:53 · answer #3 · answered by Anonymous · 0⤊ 0⤋
When entering a garage. Negative acceleration is a decrease in acceleration, i e slowing down.
2006-09-08 09:23:34 · answer #4 · answered by Amphibolite 7 · 0⤊ 0⤋
The mathematical formula for acceleration is
a=(v-u)/t. v= final velocity u= initial velocity t= time
Time can NEVER be negative, so it does not influence the sign of acceleration.
Thus, only the term (v-u) affects the sign. Algebraically then, acceleration is only positive if (v-u)>0 or v>u (i.e. if the car is increasing its velocity)
Thus the car has a positive velocity while leaving the garage.
2006-09-08 03:07:22 · answer #5 · answered by m_abduhu 1 · 0⤊ 0⤋
assuming it is traveling in a straight line:
leaving garage = increasing speed =acceleration(positive acceleration)
entering garage = decreasing speed = decceleration(negative acceleration)
2006-09-08 03:26:53 · answer #6 · answered by Archer 3 · 0⤊ 0⤋
Garage, henhouse, latrine - no matter what you are entering or exiting when going faster you are accelerating, when slowing you are decelerating.
If you are going to term going slower 'negative acceleration', going faster must be 'positive deceleration'.
By such criteria we could say 'satiety' is negative hunger or appetite, 'frigidity' negative heat and so on. Forgive me...Please.
2006-09-14 17:28:33 · answer #7 · answered by Anonymous · 0⤊ 0⤋
When it is entering a garage it has deceleration or -ve acceleration
2006-09-08 02:56:34 · answer #8 · answered by A 4 · 0⤊ 0⤋