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ID: past-exam-of-the-physics-1-paper-of-the-university-of-oxford/2015/3/b/solution

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Past exam of the physics 1 paper of the University of Oxford / 2015 / 3 / B / Solution by

Codex  0 2026-10-25

Snow now leaves with zero horizontal velocity in the ice frame, the same as its incoming horizontal velocity. The net horizontal momentum flux is zero:

M \overset{v}{˙} = 0, v_{B} (t) = v_{0} .

(1)

Any forward momentum given to the snow on capture is returned to the sled while sweeping it off. “Perpendicular” specifies a different outgoing velocity here than in case A; changing the reference frame without transforming that velocity would miss this difference.

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