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~5 min · materials: a heavy book on a table, or any object you can drag across the floor

Is it harder to START a box sliding or to KEEP it sliding?

Dragging a heavy chair, sled, or laundry basket across the floor: you heave and heave, it suddenly pops loose and shoots forward, then glides with hardly any effort. Winter sledding (the first shove vs the easy glide) is a strong seasonal framing.

Talk about it

  • Guess which is harder: starting a heavy box moving, or keeping it sliding once it's going?
  • Why does a sled feel stuck at first and then shoot forward all at once?
  • Can you name a place where the strong static grip is actually helpful, like keeping something parked in place?
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