* Direction: We use a coordinate system (like a number line) to describe direction.
* Typically, movement to the right or upwards is considered positive.
* Movement to the left or downwards is considered negative.
* Example: Imagine a car moving on a straight road.
* If the car is moving to the right (positive direction), its velocity is positive.
* If the car is moving to the left (negative direction), its velocity is negative.
Key Points:
* Zero Velocity: When an object is stationary, its velocity is zero.
* Negative Velocity Doesn't Mean "Slower": A negative velocity simply indicates a direction opposite to the chosen positive direction. It doesn't mean the object is moving slowly.
* Changing Velocity: Velocity can change over time due to acceleration (a change in speed or direction).
In summary: Velocity is positive or negative depending on the direction of motion relative to a chosen coordinate system. It's a way to represent both the speed and the direction of movement.
