It's a general property of any substance that it expands on heating and contract on cooling but certain substances behave just different way at certain range of temperature. Water is an example.
Water expands on cooling from 4°C to 0°C or you can say water contracts on heating from 0°C to 4°C.
This unusual behaviour of water is called Anomalous expansion of water
Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.
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