Make a Soap-Powered Boat

Make a Soap-Powered Boat

Cut out a small piece of cardboard, roughly in the shape of a boat.
Drop your boat into a bowl of water.When the ripples settle down, notice that the boat doesn't go anywhere.
Turn the boat over and put a small drop of soap onto the back of the boat.Drop the boat onto the water again, just like before. Watch it zip across the water! When you first dropped the boat onto the water, the surface tension of the water molecules was putting an equal force all around your boat. Soap breaks the surface tension at the back of the boat, so the unequal surface tension at the front of the boat pulls the boat forward. You'll need fresh water to try this experiment again.