# With the help of a movable block, the worker lifts a load weighing 600N

With the help of a movable block, the worker lifts a load weighing 600N to a height of 4, with what force does he pull the rope? how long the end of the rope will it stretch

When lifting a load using a movable block, there is a twofold gain in strength, but a loss in distance is also twofold – the golden rule of mechanics.
Let us find what force the worker must apply in order to lift a load weighing 600 N with the help of a movable block:
600: 2 = 300 N.
Let’s find how long the rope will stretch if the load was lifted by 4 m:
4 * 2 = 8 m.
Answer: to lift the load, the worker must apply a force of 300 N, and he will pull the rope 8 m long.

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