Models and modelling assumptions

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C O A I S T N X F N H U X A F S Y P F
X P G N J V J B A A L J S E R Q I Q C
E N B B R W I Q O T R U U C D D X H J
C C N N M E M D T W D W K A E F D B L
X R Q E A Q Y V K O J P B F A U O T L
H O O E A E I I D X I F S R V L Q L G
T U W H O Q S X C S T Y L U E N H I N
B G B Y V U K H D U D E U S T D C J I
Y H M K H W W D P T F N B H P G A P A
A S A H P Q W R H D K G U T J F Q Q J
D U Y Q E H K H V R V M Q O G R B D U
N R B Y V T T G P D X B J O D R I A G
I F L N L U F B T E Y D L M A M W L R
E A E P R A Q H Y X X T T S V N U C F
S C D S H F N W G T P T L G T R E R I
W E O J M A I R R E S I S T A N C E C
V W M Q U S K N P N X G P P B P H I B
L D U W Y P M L O P N V M S H L N N U
S M F Y O C W X P G D E M K R U I L P

Clues

  • Friction between object and surface is ingnored. (assume there isn't any) (6, 7)
  • Modelling Assumption (5)
  • Normally negibible (3, 10)
  • There IS friction between the surface and objects on it when they are moving. (5, 7)

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