Kids Riddles

Question: I join you in battle, fist clenched tight.
We pound three times with all our might.
If my rival decides he will sign for peace;
I'll crush him, and the fight will cease.
But if he lays his hand down flat;
I'll suffer defeat, that is that.

What am I?

Question: When do you go at red, but stop at green?

Question: 100 feet in the air, yet its back is on the ground.

What is it?

Question: I'm red, blue, purple and green.
No one can reach me, not even the queen.

What am I?

Question: What am I?