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Movement in Water

Reference chapter

Question 1
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A student carried out an experiment to find out how long it takes for differently shaped models to fall one metre through a thick liquid called paste.

Five models were tested, each with a different shape. Each model was tested three times.

Shape 1 Shape 2 Shape 3 Shape 4 Shape 5

Shape 1

Shape 2

Shape 3

Shape 4

Shape 5

Results

Shape

Time taken to move through one metre of paste (s)

 

Trial 1

Trial 2

Trial 3

1

12

11

12

2

9

9

7

3

13

13

12

4

5

6

6

5

10

9

9

 

(a) Complete the table opposite (NB. To find the average speed in metres/second, you have to divide 1 metre by the average time in seconds.)

Shape

Average time
(s)

Average speed
(m/s)

1

 

 

2

 

 

3

 

 

4

 

 

5

 

 

(b) Which of the shapes moved through the liquid the fastest? Give an explanation for this result.

(c) Study the drawings of three different fish. Which of these fish will swim through the water (i) the fastest? (ii) the slowest?

flat fish

angel fish

herring

flat fish

angel fish

herring

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