Year 9 Science · Unit 4 · Lesson 15
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Learning Goals
Odd one out
Circle the item that does not belong in each group. Then explain why it doesn't fit — your reason must use science from Lessons 11–14.
| # | Group | Odd one out + reason |
|---|---|---|
| 1 | distance speed mass velocity | |
| 2 | gradient area slope rise÷run | |
| 3 | acceleration deceleration velocity displacement | |
| 4 | m/s² km/h m/s mph |
Synthesis scenario — delivery drone
A delivery drone flies: 2 km north in 4 minutes, then hovers (stationary) for 1 minute, then flies 3 km east in 6 minutes. Use this information to answer all four questions below.
(a) Calculate the total distance travelled by the drone for the whole journey (including the hover).
(b) Calculate the magnitude (size) of the drone's displacement from its starting point. Hint: the drone flew north then east — use Pythagoras: displacement = √(2² + 3²) km.
(c) Calculate the average speed for the whole journey (including the hover) in km/h. Hint: total time = 4 + 1 + 6 = 11 minutes = 11/60 hours.
(d) Calculate the average speed during the flying segments only (excluding the hover). Compare this to your answer in (c) — why is it different?
Wrap Up
In one sentence, what was the main idea of this lesson?