Is crying or showing emotion a sign of weakness?

Usually, crying is an indicator that one is hurting in some way, which demonstrates pain and proves deviation from absolute strength. Having said that, "absolute strength" is hardly relevant to the human race in general, and the degree of weakness shown really depends on the situation.

Not generally, in my opinion. I think there are times control is warranted and for the best because our emotions can hurt others, but I think more often it’s a good thing.

It depends on the situation. Some people are honestly way too emotional and it’s pathetic.

On the contrary, real men exhibit both!

No.. I wish I could sometimes

It is stress leaving the body

Where there is violent conflict with a hostile opponent, it may cost not only our own life but the lives of others. Within a civil society, it is a foundation which may have a significant value in preserving our own life and the lives of others.

No. It means you're capable of feeling and aren't afraid to show it. So long as it doesn't get out of control and become destructive, it can be a sign of courage.

Depends. Sometimes it's strength. Especially if an emotion is felt but rational actions are taken despite an emotion.

Absolutely not.
But it's better not to shed tears before anyone

More like a show of strength