Group A Durable materials some mats. = durable mat. not rust or weaken not damaged by weather, e.g., sun, rain, cold rubber = v. dur. bronze (copper (Cu) + tin (Sn)) = q. dur. steel = x BUT can paint to protect uses: rubber = tyres, painted; steel = bridges
Unit 5 Fast and slow Exercise D A space rocket
40,000
A satellite A jet plane
A racing car A steam engine
A skateboard A nuclear submarine A tram
900 202 85 Table 1: Top speed of selected vehicles (kph) Unit 5 Save your energy Exercise C
Group A Steam engines Cons. of E. in steam eng. en. source = furn. furn. boil.
= chem. E. = heat E.
kin. E.
slopes slopes
heat. E. kin. E.
= drives wheels = kin. E. = pot. E.
pot. E. kin. E.
Unit 6 Is it safe? Exercise C
Group A X-rays Topic
X-rays show inside of components
Explanation eng. take X-rays of key parts; analyze look for probs.