Question

_________ acceleration occurs when an object speeds up.

Answer 1

Positive acceleration occurs when an object speeds up.

Explanation:

Acceleration is the rate of change in velocity per unit time:

$a=\frac{\Delta v}{\Delta t}$

where $\Delta v$ is the change in velocity while $\Delta t$ is the time interval. From the formula, we can understand that when $\Delta v$ is positive, so when the object is speeding up, the acceleration is positive; on the contrary, when $\Delta v$ is negative (so, when the object is slowing down), the acceleration is negative.

Answer 2

The Positive acceleration of a body is the acceleration that speeds up the object under acceleration.

Explanation:

The acceleration of a body is a vector quantity that requires the direction along with the magnitude for its representation. The acceleration of a body is defined as the change in velocity per unit time of the body under the motion.

The direction of acceleration helps in determining whether the body will speed up or its speed will decrease during the motion under the acceleration.

If the direction of acceleration of the body is in the direction opposite to the motion of the body, then this acceleration of body will reduced the velocity of the object.

On the other hand, if the direction of acceleration of the body is same as the direction in which the body is moving, then it will speed up the object during the motion.

The acceleration of the body acting in the direction opposite to the motion of the body is called as the negative acceleration whereas the acceleration of the body along the direction of motion of the body is termed as the positive acceleration.

Thus, The Positive acceleration of a body is the acceleration that speeds up the object under acceleration.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Acceleration

Keywords:

acceleration, speed, velocity, positive, speeds up, direction, opposite, along, motion, reduce, increase.