-->

Units And Measurement

Question
CBSEENPH11016792

Two forces F2,= (50±0.35)N and F2= (35±0.16)N are acting simultaneously on a body. Find the net resultant force on the body if they are acting in: (i) same direction (ii) opposite direction

Solution
(i) When the two forces are acting in same direction, then
F = F1 + F
  
equals space open parentheses 50 plus-or-minus 0.35 close parentheses straight N plus open parentheses 35 plus-or-minus 0.16 close parentheses straight N
equals space open square brackets open parentheses 50 plus 35 close parentheses plus-or-minus open parentheses 0.35 plus 0.16 close parentheses close square brackets straight N
equals space left parenthesis 85 plus-or-minus 0.51 right parenthesis straight N
(ii) When the two forces are acting in opposite direction, then
F = F- F2
  
equals space open parentheses 50 plus-or-minus 0.35 close parentheses straight N minus open parentheses 35 plus-or-minus 0.16 close parentheses straight N
equals space open square brackets open parentheses 50 minus 35 close parentheses plus-or-minus open parentheses 0.35 plus 0.16 close parentheses close square brackets straight N
equals space left parenthesis 15 plus-or-minus 0.51 right parenthesis straight N