Magnetic propulsion on water?

1. The problem statement, all variables and given/known data

I need to find a way to propel a model boat using magnetic forces, without the use of battery or electrical power.



2. Relevant equations

Unsure (I am in grade 4)





3. The attempt at a solution I have looked into the use of 9V batteries, and use of an electric circuit, but I need to use natural forces (if necessary - combined with magnetic). Is this possible? And any advice on how it can be done?



Thank you very much.

1. The problem statement, all variables and given/known data







2. Relevant equations







3. The attempt at a solution