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A 3 m long plank is on a pivot (located at 1m of the left side). A user applies a 400 N force on the end of the left side. To be in balance, what force must be apply on the opposite side?
  • A
    400 N
  • B
    200 N
  • C
    600 N
  • D
    800 N
To obtain equilibrium:
A x Fa = B x Fb
1 x 400 = 2 x Fb

Fb = 400 / 2 = 200 N

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