8.3 a system in which oil cannot be used as a lubricant 8.4 an automatic swimming pool cleaner Explain why you chose the particular material for each of these gears.


Question 9 9 Calculate the mechanical advantage for a nutcracker given the following details: • • •


input force 3 N


distance from the effort force to the fulcrum 120 mm distance from the load force to the fulcrum 36 mm


Question 10 10 A bicycle chain wheel has 58 teeth and the rear wheel cogs have 20, 22, 24 and 26 teeth. Which of the gears on the rear wheel would be best to use in the following situations? 10.1 Riding up a steep hill 10.2 Starting from a standing position at a stop street 10.3 Riding on level ground when you are riding at the speed you want.


Question 11 11 Explain each of the following terms. 11.1 Jockey arm 11.2 Cog 11.3 Derailleur gear system 11.4 Chain wheel


Question 12 12 Your bicycle has a 650 mm diameter wheel and a gear ratio of 1 : 2. Calculate how many revolutions you need to pedal to cover a distance of 50 m.


Question 13 13 Use pictures to draw an input–process–output systems diagram to illustrate one of the following: 13.1 Writing a story for a school magazine 13.2 Preparing a soccer team for a big game You can add brief notes under each of the pictures to explain each stage.


Question 14 14 Write a paragraph, stating three positive effects of mining in South Africa.


Question 15 15 Write a paragraph, stating three negative effects of mining in South Africa.


(2)


(4)


(3)


(4)


(2)


(4)


(2)


(2) Total: 40 marks 130 Term 3 Exemplar test


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