Friction Wheel On Carpet

There is a difference in slipperiness among directions of a carpet.

Friction wheel on carpet.

Thanks to the increased sized of the caster this enables the wheel to roll over the carpet and even tile. It is mainly caused by non elastic effects. On dirt non pneumatic wheels showed rolling resistance higher than carpet. Consider a 102kg 1000n trolley on a set of four soft rubber castors sitting stationary on a rough concrete floor where the rubber wheels deflect deform due to the load put up on them.

Rolling resistance of a castor wheel mounted machine or equipment is therefore the measure of the friction between floor surface and the tread of the castors wheel. This is not a friction problem per se. One way to determine the coefficient of rolling friction between a wheel and some surface is to measure the torque required to keep the wheel rolling at a constant velocity. That is not all the energy needed for deformation or movement of the wheel roadbed etc is recovered when the pressure is removed.

However it is interesting that the non pneumatic wheel performed almost as well as the pneumatic wheel on concrete below freezing temperature 25 f. Solid friction laws says no and this is clearly demonstrated in the table below. Rolling resistance and industrial wheels hamilton white paper no. Another way is the start the wheel rolling at some velocity and time how long it takes to for the wheel to stop.

11 introduction friction plays a major role. The resistance of the caster to roll on the carpet is more a function of the wheel size how far will it sink into the carpet and the internal resistance to. Once wheels are slipping traction per wheel is tw k x ww where ww is weight per wheel and k a constant depending on tyre and ground materials. Each wheel is capable of holding up to 130 pounds.