I moved into some other forums and looked at some question.

There are two questions I cannot explain them clearly althought they maybe very simple.

1.Do a wheel and a ship have the same kinetic energy (same mass + same velocity)?

2.Mass of a thing increases when there is collision with that thing.

1. No. (I presume you mean that the centre of the wheel has the same velocity as the ship?) The wheel has extra kinetic energy from its rotation.

 

2. No. Why would it? If you crash your car, is the car heavier afterwards?

Strictly speaking there is nothing such as the velocity of a rigid body, unless the body is translating. In which case both a ship and a wheel would have same kinetic energy.

I found the answer for question one is "no" and question 2 is "yes".

I don't think so.Therefore, I put them here.

The mass could vary depending on the velocity and liberation of energy during the collision. The atomic bomb is a large number of collisions (Uranium 235)releasing a substantial amount of energy into the environment. This causes a noticable difference in mass (about two grams less) in surrounding material samples. Energy transfer is the relation between mass and collisions.

Yeah, in nuclear and chemical reactions, matter can be converted to energy, or was it just nuclear? Hmm.....