In Abdomenizer: Gym equipment question for maths / engineering types

Gym equipment question for maths / engineering types Is there a difference in the force required to lift a weight which is held in the hand and one attached to a plate loading machine? Specifically I mean using free weights and machines to perform the same exercise, eg a bicep curl. Free weight: Machine: In practice its easier to lift a heavier weight on the machine. This is partly because you don ...Abdomenizer