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# Long description

This is a photograph of an ornate horse on a vintage merry-go-round (as found at a fun fair) with poles above and below. Red arrows on the floor are along the direction of the motion of the horse and get bigger further from the centre. They are labelled ‘tangential velocity increases with distance from the axis’. A yellow arrow is directed outwards from the axis at right angles to the red arrows. It is labelled ‘outward movement requires tangential acceleration to keep up with horses’.