Vocabulary Friction is the resisting force between two materials that are in contact with each other Aerodynamics or wind resistance is the resisting force that a moving object feels as it moves through the air, proportional to the object's speed and geometry.
Strength refers to the stiffness of a material.
A strong material will not bend. The term weight refers to the heaviness of the material. Students want to select a material that's strong, but lightweight. The more weight a car has, the slower it will go. Students can strengthen lighter materials by experimenting with its shape.