## Can decreasing acceleration be negative acceleration ?

Can decreasing acceleration be negative acceleration ?

 PhysOrg.com physics news on PhysOrg.com >> Promising doped zirconia>> New X-ray method shows how frog embryos could help thwart disease>> Bringing life into focus
 Recognitions: Homework Help Yes a decelerating body will have a negative acceleration.
 No deceleration is constant not decreasing acceleration

Mentor

## Can decreasing acceleration be negative acceleration ?

 Quote by Celluhh Can decreasing acceleration be negative acceleration ?
Decreasing acceleration can be, but does not need to be, negative acceleration.

Example #1: decreasing and negative:

t = 0, a = -1
t = 2, a = -2
t = 3, a = -3

Example #2: decreasing and positive:

t = 0, a = 5
t = 1, a = 4
t = 2, a = 3

 Yeah exactly I agree With you but my teacher insists that I am wrong and claims that decreasing acc cannot be negative acc. Whew !! At least someone has the same thinking as me .
 Erm but for your first example acc is increasing right ?
 @Celluhh since, acceleration is a vector..it can be negative... If the acceleration is against the velocity of the particle..then it is said to be a negative acceleration... the sign "negative" simply indicates that acceleration is opposite to velocity vector... the "negative" sign has nothing to do with the magnitude of the acceleration ...a negative acceleration just means that it is opposite to the direction of motion..