P2 Forces and Motion Mark Scheme

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  1. (a)32  gains 2 marks else working  gains 1 mark  (b)2850 ecf3  gains 2 marks  N  for 1 mark  else working  gains 1 mark  (c)friction/air resistance increases with speed; 3till frictional = ma forward force;then force/acceleration is !ero  for 1 mark each(alternative limitation for safety gains 1 mark only) [8] 2. (a) evidence of acceleration = change in speedtime or 0#$3 3  gains 1 mark  but 0#2  gains 2 marks %nits m/s 2  for 1 mark  (b)(i)2000 or  &'$0&  for 1 mark  (ii) evidence of  2 power = work donetime taken   or  weight  speed ( credit figures) / 250$#  gains 1 mark  but &200/&&$ or    figure consistent with (b)(i) gains 2 marks watford grammar school for boys1  (c) evidence of  3force = mass  acceleration or  200  0#3  gains 1 mark  but $0  gains 2 marks but $0 * weight of girder (20$0/2020 ) (or figure consistent with (b)(i)) gains 3 marks [9] 3. (a) evidence of    change in speedtime taken or +05 3  gains 1 mark  ( credit 50/&0 or 5 with 1 mark  ) N,-   +0/&0 or 50/5 but 8 .N## negatie not re1%ired  gains 2 marks %nits metres per second per second or (metres per second s1%ared or m/s)  for 1 mark  (b)(i) idea that  3accelerates at first d%e to grait4air/wind resistancefriction/resistance/drag with air increases with speedeent%all4 grait4 and friction cancel balance or (no net/accelerating force) .N,- terminal elocit4 each for 1 mark  (ii) idea &a bigger resistance/friction/drag at an4 gien speed( credit a bigger drag (factor))  for 1 mark  (c) evidence of  &0 /  '#8 /  '#8&& or 50/35(5)  for 1 mark  [8] watford grammar school for boys2   4. (a) ideas that greater speed means more kinetic energ43  gains 1 mark  but any evidence of the formula  m 2 but making the case that kinetic energ4 depends on the speed s1%ared  gains 3 marks or  that 2 2  = +(b)(i)an4 eidence of concept of moment%m or mass  speed$(or elocit4) in words or fig%res e#g# '#5  20 or  0#5  +0  gains 1 mark  but correct al%es for moment%m of lorr4 and car i#e# &'0 and 20 .ignore %nits  gains 2 marks but initial moment%m correctl4 calc%lated&0 or &'0 6 20  gains 3 marks -7Neidence when calc%lating final speed of idea that moment%m is consered%se of combined mass each gain 1 mark  but & .or 0#&  fig%re for initial moment%m(N direction not re1%ired)  gains 3 marks (ii)kinetic energ4 is lost&  for 1 mark  . credit   (some kinetic) energ4 transferred as heat/so%nd.N 9ccept onl4 answers in terms of energ4 as re1%ired b4 the 1%estion [10] 5. (a).N e#c#f not allowed from incorrect form%la 2work done = force  distance or 250  5  gains 1 mark  but &250  gains 2 marks watford grammar school for boys3  (b)  · (mainl4) transferred as kinetic / moement energ4 2.not makes bike moe · (some) lost / wasted / transferred as heat / so%nd or %sed to oercome friction / air resistance each ·   for 1 mark  [4] 6. (a)acceleration = takentimeelocit4/speedinchange 3 or +&0  gains 1 mark do not penalise if both of these present but ‘change in’ omitted from formula but 2#5  gains 2 marks %nit m/s 2   or metres per second s1%ared or metres per second per second or ms  :   for 1 mark  (b) evidence  of %sing area %nder graph or distance aerage speed  time3 or &0  +   2&  gains 1 mark  but 20  gains 2 marksunits metres / m  :2  for 1 mark  (c)force = mass  acceleration or 5  252  gains 1 mark  but &85  gains 2 marks*! orrect unit to be credited even if numerical answer wrong or absent# [8] 7. (a)reference to2 watford grammar school for boys4
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