DIRECTORATE SENIOR CURRICULUM MANAGEMENT (SEN-FET)

HOME SCHOOLING SELF-STUDY WORKSHEET

SUBJECTNautical Science GRADE 11 DATE 8/4/20

TOPICTides TERM 1

REVISION1 TERM 2

CONTENTX

TIME ALLOCATION

20minTIPS TO KEEP HEALTHY

1. WASH YOUR HANDS thoroughly with soap and water for at least 20 seconds. Alternatively, use hand sanitizer with an alcohol content of at least 60%.2. PRACTICE SOCIAL DISTANCING – keep a distance of 1m away from other people.3. PRACTISE GOOD RESPIRATORY HYGIENE: cough or sneeze into your elbow or tissue and dispose of the tissue immediately after use.4. TRY NOT TO TOUCH YOUR FACE. The virus can be transferred from your hands to your nose, mouth and eyes. It can then enter your body and make you sick. 5. STAY AT HOME.

INSTRUCTIONSThis worksheet is to be completed in your MRTE exercise/activity book.

TidesQUESTION 1 1.1 What are the two main causes of tides?

(2)

1.2 What is the correct term given to the following tidal phenomenon?2.1.1 Rising tide

(1)2.1.2 Rising tide

(1)

1.3 Define a tide.

(4)

1.4 During which phases of the moon does1.4.1 Spring tide occur? (2)1.4.2Neap tide occur?

(2)Sub Total [12]

QUESTION 2 2.1 By means of a simple line diagram indicate the various tidal levels. Your

sketch should include, among other information the: LAT, HAT, MHWS, MHWN, MLWS, MLWN, MSL,CD, etc.

(8)Sub Total [8]

QUESTION 3 3.1 The draught of your vessel is 2,62 m and you are required to navigate

through Knysna Heads with a minimum chart depth of 2,5 m.

What is the earliest time on a rising tide on the afternoon of Thursday25 December 2007 that your vessel may transit with an under-keel clearance of 1,5 m? (15)(For Tidal Table info. see ‘Nautical Science Paper I - Grade 12 Annexure (2011)’

Sub Total [15]GRAND TOTAL : 35