A system of three objects

3objectsNewton2LawA system is composed of three objects with masses m, 5m and 6m. The coefficient of kinetic friction between the objects m, 5m and the surface is 0.5. Find the acceleration of the objects.
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How much weight should he be able to lift ?

PulleyCeilingLet’s say that a man is able to lift from the floor a load of 100 kg. He is wanting to lift even more load. The man tied a rope to the load and passed the rope through a pulley block. The pulley is fixedly attached to the ceiling. How much weight should he be able to lift with the help of this pulley?

 
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What is the minimum force ?

2Blocks01

What is the minimum force F must be applied to lift the body mass m? The height of the inclined plane is equal to H and the length of the inclined plane is equal to L. Consider the blocks to be weightless and neglect friction.

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