There are 2 pieces of supporting rope and when we divide the weight between them we get 120 kg.
Because there are two sections of rope supporting the weight, we can divide the force required to lift the weight 150/2 = 75 kg.
To determine how much force is required to lift the weight, determine how many sections of the rope are bearing the weight and divide the weight among them.
30/ 2 = 15 kg
This pulley system appears to be more complicated than previous examples, but the same principle applies. We divide the weight among the four rope supporting sections. 800 / 4 = 200 kg
Because there is only one load bearing section of rope, the force required to lift the weight is the same as the weight itself.
Because there is only one load bearing section of rope, the force required to lift the weight is the same as the weight itself. The answer is 70 kg.
