define acceleration.what are its units is it a scalar or vector quantity.
Answers
- Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.
- The quantity is either a vector or a scalar. These two categories can be distinguished from one another by their distinct definitions: Scalars are quantities that are fully described by a magnitude (or numerical value) alone. Vectors are quantities that are fully described by both a magnitude and a direction.
Answer:
In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity.
It is thus a vector quantity with dimension length/time².
In SI units, acceleration is measured in meters/second² using an accelerometer.
To accelerate an object is to change its velocity, which is accomplished by altering either its speed or direction (like in case of uniform circular motion) in relation to time.
In this strict mathematical sense, acceleration can have positive and negative vals (deceleration).
Any time that the sign (+ or -) of the acceleration is the same as the sign of the velocity, the object will speed up.
If the signs are opposite, the object will slow down.
Acceleration is a vector defined by properties of magnitude (size or measurability) and direction.
When either velocity or direction are changed, there is acceleration (or deceleration)