The speed stays constant.
When distance is kept constant but the force changes, the work done will depend on the magnitude and direction of the force applied. If the force increases, more work is done, and if the force decreases, less work is done. The relationship between force and work done is directly proportional when distance is constant.
That force is gravity.
Yes, rust happens to iron nail though it is kept in distilled water.
No. Kepler proposed that some force kept the planets in orbit, but did not know or say what that force was. It was Isaac Newton who figured out that this force is gravity.
It rots.
By a force called gravity
The United States kept a military occupational force of 200,00 troops in the former States of the Confederacy.
If you mean centripetal force, I was surprised when I saw that the water was not spilled when it was swung around in a circle, but then I learned that centripetal force kept it inside.
inertia
it stick together as lumps
Not much.
Nothing