:Moving Water
Trend Task
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Approach:  One to one  Level: Year 4 and year 8
Focus: Tides   
Resources: Video recording on laptop computer
272KB

Questions/instructions:

This activity uses the computer.

In this activity we’re going to look at a video showing low tide and high tide.The first part shows low tide. The second part shows the same place later in the day at high tide.

Click the Moving Water button and the video will start.

[No voiceover; sound of waves only]

 
 
% responses
2003 ('99)
y4
y8
CLICK HERE for diagram that accompanied marking guide.    
1. Every day the tide goes in and out.
What do you think causes the tide to go in and out?
full explanation
1 (0)
4 (0)
mentions moon and gravitational forces
3 (2)
20 (22)
mentions moon
9 (11)
19 (14)
2. If low tide is at 6 o’clock in the morning, about what time will it be low tide again?
[about 12 hours 25 minutes later]
6:30pm
1 (1)
0 (1)
6:00pm
33 (39)
48 (47)
3. Why do you think the tide is out twice most days?
mentions idea of two bulges and two shallows (see marking guide)
0 (0)
2 (0)
Total score:
4–6
1 (0)
4 (1)
3
2 (2)
10 (14)
2
6 (6)
19 (13)
1
33 (38)
36 (33)
0
58 (54)
31 (39)
Commentary
This was a very demanding task. It is difficult to understand why there are two tidal peaks and lows per 24 hours. Year 8 students scored a little better than year 4 students.
 
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