Answer:
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
A tree with 5 branches, no leaves and no fruits
What's a place you have left but didn't enter?
What get wet while drying
Both punishment and sweet reward, It will befall both fool and lord. It is a spiritual scoreboard, Your every deed it does record.
It's what light turns into in the night
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?