Given : Effort arm = 12 cm, Load arm = 4 cm, Effort E = 100gf,
Load L = ?
(Nut cracker is the lever of second order)
Since, Load/Effort = Effort arm/Load arm
∴ L/100 = 12/4
Or L = 300 gf.
Thus, a force of 300 gf is required to crack the nut without using the nut cracker.