- A scalar quantity is a quantity containing only the magnitude but no direction. Examples include speed or distance.
- A vector quantity is a quantity that takes into account both direction and magnitude. Examples include velocity or displacement.
The image below shows a distance-time graph :
- At A and B, The car is going at a constant speed as they are straight, diagonal lines. We can see this because there is a constant change in distance per time.
- At C, the car is at rest for 5 seconds as it is a straight horizontal line. We can see this because there is no change in distance.
- At D, the car is going back to its starting point as there is a negative change in distance.
The slope of a line at any point on a distance-time graph is the speed of the object. The steeper the line, the faster the object is moving.
So, the Speed (m/s) = Distance (m) / Time (s)
The Speed at A = Distance (m/s) / Time (s) = 15m…