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This activity makes a good kinesthetic activity. For the Coriolis acceleration, designate an origin, then ask students to hold their arm out in the direction of $\rr$, then to determine the direction of $\Omega\times\rr$, and finally to determine the direction of $-\Omega\times(\Omega\times\rr)$. For the Coriolis accelerations, ask students to stand up and face in any direction they choose — their velocity $\vv_R$ — then have them work out the direction of $-\Omega\times\vv_R$.