Quote Originally Posted by uv8452 View Post
Tony, thank you very much for the hint.
A finger force of 70 Newton corresponds roughly to 7 kilograms. Double this even more roughly and you get 14 lbf. The exact value is 15.7 lbf. I could have checked it easily that the '300 lbf' were wrong. I'm sorry. The woman's finger force of 50 Newton corresponds to 11.2 lbf.
Ulrich
My rough mental conversion Kg or Kgf to lb or lbf is double it and add 10%. So 7 x 2 = 14, 14 + 1.4 = 15.4

"70 Newton corresponds roughly to 7 kilograms." No it doesn't, apples and oranges. 70 N corresponds roughly to 7 Kgf.