# Velocity-time Graphs (Distance Travelled)

## Velocity-time Graphs (Distance Travelled)

• A velocity-time graph illustrates how the speed of an object changes over a particular span of time.
• The vertical axis represents velocity or speed, where the positive side shows forward movement and the negative side indicates reverse movement.
• The horizontal axis represents time.
• A straight line on a velocity-time graph illustrates a constant speed, while a non-linear (curved) line represents varying speed.
• The gradient of the line on the graph shows the rate of acceleration or deceleration. A steeper line shows faster acceleration or deceleration.
• The area underneath the graph line is equal to the total distance travelled by the object.
• It’s crucial to note that if a graph falls below the x-axis (time), it signifies that the object has changed direction.
• A horizontal line indicates that the object is travelling at a constant velocity, with no acceleration nor deceleration.
• A line with an upward slope signifies acceleration, whereas a line with a downward slope suggests deceleration or slowing down.
• A graph that starts above the x-axis and then crosses it to the negative side indicates that the object has changed direction and started moving in the opposite direction.
• If the velocity-time graph is a curve, then the object is either accelerating or decelerating at a non-constant rate.