MARL044 — Apply basic principles of marine mechanics

1 Use vector diagrams to calculate the resultant and equilibrant of up to four coplanar forces

• 1.1Meaning of force as a vector, moment of a force, resultant and equilibrant are explained
• 1.2Forces using the triangle and polygon of forces are determined
• 1.3Moments and couples applied to beams and levers are explained
• 1.4Centroid of an area is calculated
• 1.5Centre of gravity (CG) of regular geometrical shapes is calculated
• 1.6Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated

2 Solve problems involving friction

• 2.1Nature of friction and the laws of dry sliding friction are explained
• 2.2Influence of lubrication on bearings and plain surfaces is outlined
• 2.3Coefficient of friction is derived
• 2.4Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces
• 2.5Effect of lubricating two surfaces in contact with each other is outlined

3 Apply laws of motion

• 3.1Laws of motion are explained
• 3.2Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion
• 3.3Formula and/or graphs are applied to solve problems of linear and angular velocity
• 3.4Linear motion is converted to angular motion and revolutions to radians

4 Solve problems in dynamics related to marine machinery

• 4.1Relationship between torque, work, energy and power in marine engines and compressors is explained
• 4.2Conservation of energy theorem is used to calculate energy and power during linear and angular motion
• 4.3Meaning of momentum is explained
• 4.4Calculations are performed associated with the collision of rigid bodies
• 4.5Centrifugal force is distinguished from centripetal force
• 4.6Centrifugal and centripetal force in relation to marine machinery is calculated

5 Determine efficiency of lifting and geared marine machinery

• 5.1Velocity ratio, mechanical advantage and efficiency of simple machines is calculated
• 5.2Calculations are performed to solve problems related to the operation of simple machines

6 Calculate stress and strain due to axial loads

• 6.1Normal stress is distinguished from strain
• 6.2Hooke’s Law for stress and strain is explained
• 6.3Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained
• 6.4Normal stress and strain caused by axial loads is calculated

7 Determine shear stress and strain in coupling bolts and simple bolted connections

• 7.1Shear stress in simple bolted connections is determined
• 7.2Torque theory is applied to calculate shear stress in coupling bolts

8 Determine stresses in thin walled pressure vessels

• 8.1Factor of safety and joint efficiency factor for pressure vessels is calculated
• 8.2Hoop and longitudinal stress in thin walled pressure vessels is calculated

What does an assessment tool for MARL044 need to cover?

To satisfy the Principles of Assessment and Rules of Evidence, an assessment for MARL044 needs to address all 61 unit components: 8 elements with 31 performance criteria, 7 performance evidence requirements, 23 knowledge evidence requirements, and the foundation skills. A coverage matrix mapping each question and task to these components is what an auditor looks for.

How does Auditori generate an assessment tool for MARL044?

Auditori pulls the current release of MARL044 from training.gov.au and generates a complete package: candidate assessment, assessor guide with model answers and observation criteria, and a coverage matrix mapping every component. A suitably qualified person then reviews and approves the draft in a built-in workflow — consistent with ASQA's guidance on AI use in VET — before export as branded PDF and editable Word.

Is the first assessment tool really free?

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Can I check my existing MARL044 assessment instead of generating a new one?

Yes — upload your existing assessment or learner guide and Auditori maps it against every element, performance criterion, PE and KE of MARL044, showing exactly what's covered and what's missing. Mapping costs a quarter of a credit.