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DataWeenie t1_iu4quck wrote

If they were on a frictionless surface, such as an ice rink, they would simply get pulled closer together. Since the child's feet are on the ground they have a lot of friction, so they don't move, whereas the wheels roll with little friction. If you replaced the wheels with cinder blocks, the wagon wouldn't move.

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HereticBatman t1_iu4sq5a wrote

Thats not necessarily true, depending on the strength of the child. You can still drag cinder blocks across the ground.

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