Question 4 — While practising for the snake boat - Questions at the end of the chapter - Chapter 6 - How Forces Affect Motion (Exploration)

Last updated at August 25, 2026 by

Q 4
Question · Revise, Reflect, Refine, Q4, page 113

While practising for the snake boat race (Vallum kalli in Kerala), 100 oarsmen are rowing a boat together. Out of these, 95 row backwards to propel the boat forward. But by mistake, 5 oarsmen row in the opposite direction. If each oarsman applies a horizontal force of 200 N, what is the net force on the snake boat? (Ignore drag forces, air friction, etc.)

Question 4 — While practising fo - How Forces Affect Moti - [Teachoo] - Questions at the end of the chapter
GIF Watch: while practising for the snake boat race (Vallum kalli in Kerala), 100 oarsmen
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Answer
  • Given: 95 oarsmen forward, 5 oarsmen opposite, 200 N each
  • Force in the forward direction = 95 x 200 N = 19000 N
  • Force in the opposite direction = 5 x 200 N = 1000 N
  • The two are in opposite directions, so the net force is the difference.
  • Net force = 19000 N − 1000 N = 18000 N
  • Answer: 18000 N, in the forward direction.
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