Top Answer
User Avatar
Wiki User
Answered 2012-02-27 21:32:21

Acceleration is negative if velocity is decreasing with time. Since velocity is a vector this can occur in one of two ways:

1) you are slowing down in the direction of motion and the velocity in that direction is defined as positive (this is what we usually mean by negative acceleration)

2) you are speeding up in the direction of motion and the velocity in that direction is defined as negative.

An example of this is an object launched into the air which immediately starts to decelerate in it's upward velocity, reaches it's highest velocity, and then begins accelerating towards the ground. If we call the velocity upward a positive velocity, then when it starts falling, it has negative velocity. Note that acceleration (due to gravity) is negative the whole time.

User Avatar

Your Answer

Still Have Questions?

Related Questions

Can a car have negative velocity and negative acceleration?

It cannot have negative velocity, it can have negative acceleration.

Can there be a positive acceleration and a negative acceleration?

Yes, acceleration can be positive and negative because acceleration is a vector. It has both direction and magnitude. The direction is what makes it positive or negative. Negative acceleration is usually called deceleration.

What is negative and positive acceleration?

Positive acceleration = speeding up. Negative acceleration = slowing down.

What is a sentence for the word negative acceleration?

Negative acceleration is a fancy way of saying something was stopping. The car experienced negative acceleration.

What is negative acceleration also called?

Negative acceleration is also called as deceleration.

What is the term used for negative acceleration?

Negative acceleration is also referred to as deceleration.

True or false car has negative acceleration it is slowing down?

false A car can have a negative acceleration and be speeding up. A negative acceleration determines the direction of the acceleration A car with forward acceleration will speed up in the forward direction A car moving forward with a negative acceleration will slow down A car not moving with a negative acceleration will speed up in the backward direction A car moving backward with a negative acceleration will speed up in the backward direction

A plane taking off is a negative acceleration?

A plane landing is a negative acceleration - "negative" meaning it slows down.

What is deceleration or negative acceleration?

Deceleration or negative acceleration is when an object or thing gets slower

How does positive acceleration and negative acceleration affect motion?

positive acceleration helps to increase the velocity for positive direction while negative acceleration resists the motion.

Can acceleration ever be negative?

Acceleration is negative when the object is moving in the opposite direction. on a graph the line would be in the negative quadrant.

What is negative accelertion?

Acceleration is any change in velocity. Negative acceleration is when the change is such that the speed decreases.

Why is acceleration due to gravity negative?

It is negative if the upwards direction is defined as positive. Acceleration is downward.

Is retardation positive or negative acceleration?

Retardation or deceleration is negative acceleration. It is opposite to the direction of velocity.

What is another name for negative acceleration?

In general, slowing down is negative acceleration. Some might call it deceleration. Braking a car or bike is a simple example of negative acceleration.

How can you have negative acceleration but not negative speed?

The negative part in negative acceleration is indicating direction, as acceleration is a vector quantity. Speed however, is a scalar and has magnitude only and therefore cannot be negative. An example could be -2.6ms-2 meaning that there is an acceleration of 2.6ms-2 but in the opposite direction to other vectors.

What is the term negative acceleration?

Negative acceleration describes a decrease in velocity over time. Accleration is an increase and zero acceleration is no change in velocity.

How is a negative acceleration different from a positive acceleration?

Actually, it depends on how you define the coordinate axes, but usually when moving forward, negative acceleration decreasesspeed, positive acceleration increasesit.

When acceleration upward or downward direction is taken positivw or negative?

If it is gravitational acceleration then it it is positive in downward and negative in upward direction..if it is not gravitational acceleration then it is depending upon the value of acceleration.

A sentence for negative acceleration?

As the taxi driver braked sharply, my friend said "Wow, negative acceleration!"

Can a body have negative velocity and positive acceleration?

no a body can only have positive velocity .sometimes it have negative acceleration

Is deceleration a form of acceleration?

Yes, it is called negative acceleration.

What is the term that describes a decrease in acceleration?

it is still acceleration, but it is negative.

Can acceleration be a negative number?

Yes, the scalar value of acceleration can be a negative number. Acceleration is the rate of change of velocity. If the speed of an object is reducing (it is slowing down), then the object is subject to a negative acceleration. An example is when you apply the brakes in a car. The brakes change the speed of the car from a higher value to a lower value, thus imposing a negative acceleration. Colloquially, people speak of deceleration, however the correct term is negative acceleration.

Difference between negative and positive acceration?

Positive acceleration ==> speeding up Negative acceleration ==> slowing down

Still have questions?

Trending Questions
How to Make Money Online? Asked By Wiki User
Best foods for weight loss? Asked By Wiki User
Does Neil Robertson wear a wig? Asked By Wiki User
Previously Viewed
When is acceleration negative? Asked By Wiki User
Unanswered Questions
How old is zak beggans? Asked By Wiki User
Does arsenio hall have ms? Asked By Wiki User