Meet the cast — the characters who teach this
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Chug (Guide) Chug the marmot who runs the Bump Lab - counts the push (how big x how fast) and asks you to guess before every bump -
Hefty Hefty the bear - pushes a big heavy cart, so pushes hard even when slow, because being BIG adds to the push (mass) -
Nippy Nippy the hare - pushes a little cart, so pushes hard even when small, because being FAST adds to the push (speed) -
Clink Clink the cricket - the coupler: when two carts bump he links them so they clink together and roll as one (the pushes add up)