Science Focus 2 - Coursebook Answers - Pearson Australia Media ...

Answers to coursebook questions Chapter 1necessary to consider several possibilities and then choose that which goes throughthe most points.7 Two places where a diagram can be useful in an experimental report are in themethod and discussion or results.8 Pie charts and bar graphs are useful for showing data but cannot be used to predictmissing results. Line graphs can be extended to extrapolate further data.Think9 a 5 ML = 5 000 000 L.b 375 mL = 0.375 L.c 500 000 mm = 0.5 m.d 6 000 000 000 nm = 6 m.10 a 1 kilosecond or 1 ks = 1 000 s = 16.67 minutes.b 1 centiminute or 1 cmin = 0.01 min = 0.6 seconds.c 1 kiloday or 1 kd = 1000 days = 86 400 000 seconds.d 1 megasecond or 1 Ms = 1 000 000 seconds = 16 666.7 min = 277.8 hours =11.6 days.Analyse11 a An aim for Sam’s experiment: To compare the time taken for a feather and astone to fall the same distance.bcHeight(m)Stone droptime (s)0.5 0.32 0.601.0 0.45 0.952.0 0.63 1.353.0 0.77 1.704.0 0.89 2.00Predicted times:i 1.5 m Feather: 1.18 s Stone: 0.54 sii 2.5 m Feather: 1.53 s Stone: 0.70 sFeather droptime (s)iii 3500 mm Feather: 1.85 s Stone: 0.83 sd Height dropped from:i 0.5 s Feather: 0.3 m Stone: 1.3 mii 1.2 s Feather: 1.5 m Stone: Beyond limitiii 1.9 s Feather: 3.6 m Stone: Beyond limite i 5.0 m Extrapolate curve Feather: 2.35 sii 5.0 m Extrapolate curve Stone: 0.98 siii 2.5 s Extrapolate curve Feather position: 6 mfThe stone fell much faster than the feather. The fall of the feather was moreunpredictable than the fall of the stone.© Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2005.This page from the Science Focus 2 Teacher’s Resource on CD may be photocopied for classroom use.