Physics
The direction of heat flow between two objects depends on

Their masses
Their heat contents
Whether they are in solid, liquid or gaseous state
Their temperatures

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in rolling a stone is less than in lifting it.
Work done in both is same but the rate of doing work is less in rolling.
Work done in rolling is more than in lifting.
Work done in lifting the stone is equal to rolling it.

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