1. Rate

2. Some definitions A rate is a special kind of ratio, indicating a relationship between two measurements A magnitude or frequency relative to a time unit; “they travelled at a rate of 80 km per hour” Amount of a charge or payment relative to some basis; "overseas phone call rates”, “postal rates” A quantity or amount or measure considered as a proportion of another quantity or amount or measure; “the literacy rate”; “the retention rate”; “the dropout rate” Others – tax rate, interest rate,

3. Speed

4. Some definitions Speed is a measurement of how fast an object is moving. Fast-moving objects can cover large distances in a small amount of time. Conversely, slow-moving objects can cover a small distance in a large amount of time Speed can also be defined as the distance travelled per unit time; “He travelled at an average speed of 70 km/h” Others – speed of light, speed of sound, shutter speed, wind speed Units for speed: km/h, m/s, m/min, cm/s

5. Graphs of Distance vs Time Distance Time 0 Object is stationary at starting point.

6. Graphs of Distance vs Time Distance Time 0 Object is stationary a distance away from the starting point.

7. Graphs of Distance vs Time Distance Time 0 Object is moving at a constant speed away from the starting point.

8. Graphs of Distance vs Time Distance Time 0 Object is moving at a constant speed towards the starting point.

9. Graphs of Distance vs Time Distance Time 0 Object is moving at an increasing speed away from the starting point.

10. Graphs of Distance vs Time Distance Time 0 Object is moving at an increasing speed toward the starting point.

11. Graphs of Distance vs Time Distance Time 0 Object is moving at a decreasing speed away from the starting point.

12. Graphs of Distance vs Time Distance Time 0 Object is moving at a decreasing speed toward the starting point.