I - the work done on a machine. When using a machine, distances are not the same. E - the distance through which the machine moves. MA is equal to 1 - the machine is used to change the direction of the effort force. MA is less than 1 - the machine is used to increase the distance an object moves or the speed at which it moves.
Work output is never greater than work input.
You use a pair of pliers to crack a pecan. It takes 1200 N of resistance force to crack the pecan, but you only exert 400 N of effort force with your hand on the pliers. Think of pliers as a pair of first-class levers . The lever arm represented by the line AB is 6 cm long. The lever arm represented by line BC is 3 cm long.