For me the best 5 year old explanation of lift has always been such: Body, gas including, temperature equals energy, total energy is the sum of kinetic and pot

For me the best 5 year old explanation of lift has always been such: Body, gas including, temperature equals energy, total energy is the sum of kinetic and potential energy and potential energy is what bumps into other objects and pushes that away. The faster the gas flows, the more kinetic energy there is, the less potential is left, thus the object is pushed with lower force. If an object shaped such that gas around opposing faces flows in different speeds moves through the gas, opposing faces are pushed with different force and you get lift. The higher the speed, the more total energy is converted to kinetic energy, the less potential energy is left, the higher the force differential. Thus, the faster the object goes, the more lift it generates. That explains minimal take-off speed of an airplane. This is by no means scientifically rock solid, but gives really good layman explanation.