As chief engineer or first assistant...

Question 1 of 2921866636ef028f7522a1c5206aa

As chief engineer or first assistant engineer you should be familiar with the six motions of a vessel. Which of these motions affects the governing "motion ahead and astern" stability?

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Question 1 of 29218

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As chief engineer or first assistant engineer you should be familiar with the six motions of a vessel. Which of these motions affects the governing "motion ahead and astern" stability?

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🔍 Key Concepts

• The six basic motions of a vessel: surge, sway, heave, roll, pitch, yaw • Which motions are longitudinal (fore-and-aft along the ship’s length) versus vertical or sideways • What is meant by "ahead and astern" motion in relation to the ship’s movement through the water

💭 Think About

• Identify which motion specifically describes movement forward and backward along the ship’s fore‑and‑aft axis • Separate in your mind which motions are rotations (like see‑saw or turning) and which are straight‑line translations • Ask yourself: if the engine increases RPM or reverses, which of these six motions directly changes first?

✅ Before You Answer

• Be clear on the definition of each of the six motions of a vessel • Verify which motion is a translation along the ship’s longitudinal axis (bow‑to‑stern line) • Confirm which term is commonly associated with speed changes ahead and astern in marine engineering contexts