Yes! In most problems direction needs to be defined as either positive or negative.
This is not true. Acceleration includes direction, but speed does not. Speed in a particular direction is called velocity.
Acceleration is the change in an ogjects speed or a change in an objects direction of motion or both of these. If instead of speed you use the word velocity , which is both an object's speed and its direction of motion, then you could say "acceleration is the change in an objects velocity" and that would cover all the possibilities in one statement.
I'm pretty sure its the acceleration. If its not that, its the Velocity.
Yes. Acceleration is defined as a change of speed and/or direction of motion. If the speed and direction of motion are constant, then there is no acceleration.
Acceleration
Acceleration in motion refers to a change in speed or direction of that object's motion. So a type of motion in which speed and direction do not change is a motion in which the acceleration is constant (i.e. unchanging).
'Acceleration' is a change in the speed and/or direction of motion.
The acceleration will either speed up or slow down an object's motion in the direction it is applied. Any change in speed or direction is considered acceleration.
translatory motion
An example of acceleration in the direction of motion is a smooth spherical stone dropped from the roof of a building on a windless day. All the motion is straight down, toward the center of the earth, and so is the acceleration.
The resistance of an object to changes in its motion is known as inertia. Changes in an objects motion include changes in its speed and direction.
'Acceleration' means any change in speed or direction of motion.'Uniform' motion means no change in speed or direction.