Additional Science-Physics Chapter 1

A distance-time graph shows the distance of a body from a starting point (y-axis) against time taken (x-axis).

The slope of the line on a distance-time graph represents speed, the steeper the line, the greater the speed it represents.

The SI unit of speed is metres per second (m/s)

Velocity is speed in a given direction. If the body changes direction it changes velocity, even if its speed stays the same.

If the velocity of a body changes, we say that it accelerates.

A velocity-time graph shows the velocity of a body (y-axis) against time taken (x-axis).

• The slope of the line represents acceleration
• If the slope is negative, the body is decelerating
• The area under the line on a velocity-time graph represents the distance traveled in the given time