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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A basic, rigid caster consists of a wheel mounted to a stationary fork. The orientation of the fork, which is fixed relative to the vehicle, is determined when the caster is mounted to the vehicle. [1] An example of this is the wheels found at the rear of a shopping cart in North America.

3. Wheelchair - Wikipedia

   en.wikipedia.org/wiki/Wheelchair

   Folding chair and stackable rigid chairs for visitors in NÄL hospital, Sweden. A self-propelled manual wheelchair incorporates a frame, seat, one or two footplates (footrests), and four wheels: usually two caster wheels at the front and two large wheels at the back. There will generally also be a separate seat cushion.

4. Caster (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Caster_(disambiguation)

   A caster is a type of wheel. Caster may also refer to: Industry. Caster angle, one of the angles important to automotive suspension; Caster, a machine used in metal ...

5. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   The theoretical Crr for a rigid wheel rolling on an elastic roadbed shows Crr inversely proportional to the square root of the load. [36] If Crr is itself dependent on wheel load per an inverse square-root rule, then for an increase in load of 2% only a 1% increase in rolling resistance occurs. [51]

6. Wheel - Wikipedia

   en.wikipedia.org/wiki/Wheel

   An early wheel made of a solid piece of wood. A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating ...

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