M16. (a) any two from: inversely proportional • as the load gets biggerthe (maximum safe) distance gets less • allow the mass increases the distance decreases’ ‘as accept an unspecified response e.g. load at a short ‘big distance’ for (1) load × distance = 60 (kNm) • 2 (b) yes, because 30 × 2 = 60 (2) accept for (1) a correct but insufficiently explained response e.g. because it’s safe’ ‘yes accept for (2) a correct response which is sufficiently explained e.g. because 60 (kNm) at 1 metre is safe and 30 (kNm) ‘yes, is half the load at twice the distance do not accept and do not accept just ‘no’ ‘yes’ do not accept because 30 is between 24 and 40 and 2 ‘yes, is between 2.5 and 1.5’ do not accept crane/ cable may break’ or other dangers ‘the 2 (c) the crane may/will topple over/fall over/forward 1 (d) results of experiments on this mobile crane accept any unambiguous indication 1 [6] M17. (a) A must be correct for reason to score moment (due to weight) of sail is the largest 1
M16. (a) any two from: • inversely proportional • as the load gets biggerthe (maximum safe) distance gets less allow ‘as the mass increases the distance decreases’ accept an unspecified response e.g. ‘big load at a short distance’ for (1) • load × distance = 60 (kNm) 2 (b) yes, because 30 × 2 = 60 (2) accept for (1) a correct but insufficiently explained response e.g. ‘yes because it’s safe’ accept for (2) a correct response which is sufficiently explained e.g. ‘yes, because 60 (kNm) at 1 metre is safe and 30 (kNm) is half the load at twice the distance do not accept ‘no’ and do not accept just ‘yes’ do not accept ‘yes, because 30 is between 24 and 40 and 2 is between 2.5 and 1.5’ do not accept ‘the crane/ cable may break’ or other dangers 2 (c) the crane may/will topple over/fall over/forward 1 (d) results of experiments on this mobile crane accept any unambiguous indication 1 [6] M17. (a) A must be correct for reason to score moment (due to weight) of sail is the largest 1
moments_and_c.o.m.docx