Try using different amounts of plasticine. The effects of lift are all around us. Birds fly because of lift. Air travels faster over the top of a wing because it's rounded. This means that the air has farther to go over the wing than under the wing where it's flat, so the air moving over the top goes faster.
Pilots work with lift all the time.
They can vary the degree of lift by extending or retracting flaps on the plane's wings. Lift even affects race cars, but in this case lift is a problem. Streamlined race cars moving at high speeds begin to fly. Drivers definitely don't want this because they depend on friction between their tires and the pavement in order to maintain speed and control. You can learn more about flight here .