Does the supermarket cart not glide on the escalator because it's trapezoid?
The design for the middle wheel barrow and groove, the surface structure of the dentate escalator uneven, when the cart to the escalator, cart wheels will fall into the middle of the uneven surface of the tooth structure of escalator, when trolley wheels on each side of a piece of rubber like films where the escalator will be with surface contact, thereby generating friction let the trolley stop.
The design for the middle wheel barrow and groove, the surface structure of the dentate escalator uneven, when the cart to the escalator, cart wheels will fall into the middle of the uneven surface of the tooth structure of escalator, when trolley wheels on each side of a piece of rubber like films where the escalator will be with surface contact, thereby generating friction let the trolley stop.
Not for this reason。The trolley does not glide on the escalator, not because of the shape of the trolley, but because of the wheel of the cart.
