In the diagram below, a 4 kg block lying on a rough horizontal surface is connected to a 6 kg block by a light inextensible string passing over a light frictionless pulley.
Initially the blocks are HELD AT REST.
5.1 State the work-energy theorem in words. (2)
When the blocks are released, the 6 kg block falls through a vertical distance of 1,6 m.
5.2 Draw a labelled free-body diagram for the 6 kg block. (2)
5.3 Calculate the work done by the gravitational force on the 6 kg block. (3)
The coefficient of kinetic friction between the 4 kg block and the horizontal surface is 0,4. Ignore the effects of air resistance.
5.4 Use energy principles to calculate the speed of the 6 kg block when it falls through 1,6 m while still attached to the 4 kg block. (5)
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