In Exp. 1 , 10 female subjects each twisted six jar lids vs a torque meter with a bare hand, rubber gripper and a cotton cloth. The torques of 3.17 Nm f o r the 48 mm dia, 5.02 for the 67 mm dia, and 6.04 for the 86 mm dia lids differed significantly. Torques of 4.04 f o r the cotton cloth in the hand, 4.85 for the bare hand and 5.36 for the rubber gripper also varied significantly. The 4.66 Nm for non-knurled was not significantly different from the 4.84 for knurled.Exp. 2 replicated Exp. 1 with 5 of the 6 lids for 29 visitors to a University Open House. The results were compatible with Experiment 1. Torque exertable on a lid can be predicted well from grip strength, lid radius and the gripping material (rubber, bare hand o r cloth).
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