with its feet.
You are now in second place. The person you overtook is now in third place. You have effectively swapped your positions.
They put in tanks and move it around where ever it needs to go.
To perform in different places
To transfer energy, u r required to change its type. Example: At dam, water alone cant make electricity, it is stored ( Pot. Energy) , it slides fastly downward ( Kinetic enrgy), push turbine...