Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

The ball will travel towards the center of the circle and fall down
It will fall down at the same place where the string breaks
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
None of these

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