Discussion
A fluid element in a flow may experience acceleration even when the flow is steady because
Answer: C
Correct answer: Velocity varies from point to point along its path
Steady means the velocity at a fixed point does not change with time, not that a particle moving through the field keeps its velocity. Following the particle, the convective term \( (\mathbf{V}\cdot\nabla)\mathbf{V} \) accelerates it - which is exactly what happens to fluid speeding up through a venturi in a perfectly steady flow.
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