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Unit summary

Revise!

1. What are the similarities and differences between 4. A butterfly travels a distance of 8 km in 1 hour.
vector physical quantities and scalar physical What distance will the butterfly cover in
quantities? Give 3 examples of each type. 20 minutes, if it moves with constant speed?
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2. Place these speeds in ascending order and 5. A jet ski travelling north near a beach has a speed
calculate their value in SI units: of 3.5 m/s when it encounters an ocean current
moving south at 2.3 m/s.
a) 36 km/h b) 36 m/min c) 36 km/s
a) What is the resultant velocity of the jet ski?
d) 36 cm/s e) 36 m/h
b) If the length of this section of the beach is
3. Look at the displacement vs. time graph below.
Use the graph to calculate: 65 metres, how long does it take the jet ski to
cross the beach, from south to north?
a) the period of time during which the object is
6. A plane travels through the air with a speed of
at rest
500 km/h. Determine the resultant velocity of the
b) the period of time during which the object plane (magnitude only) if it encounters:
moves uniformly
a) a 25 km/h headwind
c) the speed of the object at 15, 25 and
30 seconds b) a 25 km/h tailwind

d) the distance covered by the object in 5 and
15 seconds

S (m)
200
175
150
125
100
75
50
25

0 5 10 15 20 25 30 t (s)

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