Why is it easier to move things on wheels than to carry them? The weight increases after all because of the weight of the wheels.
In: Physics
If you load a sled and pull it, you’re resisting friction and friction is proportional to the weight of the load. If you load a cart and push it, the wheels are actually using friction to rotate against the ground. Thus you’re actually using friction to your advantage and the only negative effects friction has are on the wheels bearings and the air resistance which are negligible compared to the friction felt on a sled.
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