Why are wheels fitted in traveling bags ? Explain ?

Why are wheels fitted in traveling bags ? Explain ?
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1 Answer

Answer :

If there were no wheels in the traveling bag, there would be a lot of friction or slippery friction while pulling it. The value of cyclic friction is lower than that of vortex friction. So the wheels are fitted in the traveling bag for the purpose of easy pulling and avoiding high quality friction.
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Bones of pelvic girdle forms a cavity in which head of the femur is fitted are

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