(a) () State Hooke's Law and describe what is determined from a graph of load versus extension for the spring. 2 For a vertically loaded spring, it is found that to compress the spring elastically by 200 mm beyond its unloaded position, a load of 4300 kg is required. Explain what is meant by the term equilibrium position and calculate the spring constant using these values given.

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.