q3 Child on swing

  3.     (a)     weight  = 28 × 9.8 / mg                                                                                    C1
            = 270 (N)      (274.4)                                                                          A1
(using g = 10 then –1)

(b)     a completed triangle drawn with correct orientation                                           B1
at least two labels for triangle with correct directions given                                B1

          calculation:                                     scale diagram:
force P / weight = tan 35                  scale given                                                C1
force P =192 (N)                             185 to 200 (N)                                          A1

  (c)    tension is greater                                                                                             B1
(reference to triangle) tension force would be greater (longer) as the holding
force P would be larger (longer) for greater angle / larger
value needed so vertical component still balances the weight                              B1