It\'s easy to develop the mistaken idea that “mechanical energy is always conser

Question

It's easy to develop the mistaken idea that “mechanical energy is always conserved”. To build up mental defenses against that, invent and describe two unique, completely distinct and concrete situations in which an object or system's ME is not conserved. In one situation, the ME should increase, and in the other, the ME should decrease. Explain how we can tell that this ME change occurs, in each case, without any calculations.

I'm posting this again because what I was given gave no situations/examples like the question asks. I need actual examples/situations, one that increases and one that decreases. Please make sure it's correct. I mean absolutely no offense to anyone, but when you're paying for these answers, you kind of want them to be correct, especially since you rarely get refunded questions. Thank you for helping!

Explanation / Answer

Mechanical energy increases ----

When a cricket ball bowled by a bowler to batsman, it goes near to bat of batsman and is hitted by batsman. In this case mechanical energy of ball increases.

When mechanical energy decreases------

A ball is thrown upward by a boy. It goes to a maximum height and then returns and hit the ground. Again it goes upward but reaches to new maximum height which is less than previous one. Similarly many times it goes up & down and finally comes to rest. Here we can see mechanical energy is decreased.

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