Which Lego project would be best for demonstrating friction?

• a car
  To get an idea of an object's friction, a Lego car test would be the best answer. With the ability to move its wheel positions and alter the incline of road surfaces, you can get a better idea of how friction slows or speeds up the car.
• a plane
  To get an idea of an object's friction, a Lego car test would be the best answer. With the ability to move its wheel positions and alter the incline of road surfaces, you can get a better idea of how friction slows or speeds up the car.
• a stationary building
  To get an idea of an object's friction, a Lego car test would be the best answer. With the ability to move its wheel positions and alter the incline of road surfaces, you can get a better idea of how friction slows or speeds up the car.