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Elements and Performance Criteria

1. Use vector diagrams to calculate the resultant and equilibrant of up to four coplanar forces
   • Meaning of force as a vector, moment of a force, resultant and equilibrant are explained
   • Forces using the triangle and polygon of forces are determined
   • Moments and couples applied to beams and levers are explained
   • Centroid of an area is calculated
   • Centre of gravity of regular geometrical shapes is calculated
   • Resultant and equilibrant of a system of concurrent coplanar-planer forces are calculated
2. Solve problems involving friction
   • Nature of friction and the laws of dry sliding friction are explained
   • Influence of lubrication on bearings and plain surfaces is outlined
   • Coefficient of friction is derived
   • Laws of friction are applied to movement in a horizontal plane and the force to overcome friction on horizontal surfaces
   • Effect of lubricating two surfaces in contact with each other is outlined
3. Apply laws of motion
   • Laws of motion are explained
   • Velocity/time and acceleration/displacement graphs are sketched and adapted to derive the standard velocity formula for both linear and angular motion
   • Formula and/or graphs are applied to solve problems of linear and angular velocity
   • Linear motion is converted to angular motion and revolutions to radians
4. Solve problems in dynamics related to marine machinery
   • Relationship between torque, work, energy and power in marine engines and compressors is explained
   • Conservation of energy theorem is used to calculate energy and power during linear and angular motion
   • Meaning of momentum is explained
   • Calculations are performed associated with the collision of rigid bodies
   • Centrifugal force is distinguished from centripetal force
   • Centrifugal and centripetal force in relation to marine machinery is calculated
5. Determine efficiency of lifting and geared marine machinery
   • Velocity ratio, mechanical advantage and efficiency of simple machines is calculated
   • Calculations are performed to solve problems related to the operation of simple machines
6. Calculate stress and strain due to axial loads
   • Normal stress is distinguished from strain
   • Hooke's Law for stress and strain is explained
   • Meaning of elastic limit, ultimate tensile strength, yield stress, limit of proportionality and factor of safety is explained
   • Normal stress and strain caused by axial loads is calculated
7. Determine shear stress and strain in coupling bolts and simple bolted connections
   • Shear stress in simple bolted connections is determined
   • Torque theory is applied to calculate shear stress in coupling bolts
8. Determine stresses in thin walled pressure vessels
   • Factor of safety and joint efficiency factor for pressure vessels is calculated
   • Hoop and longitudinal stress in thin walled pressure vessels is calculated

Required Skills

Required Skills

Assess own work outcomes and maintain knowledge of current codes standards regulations and industry practices

Explain basic principles of marine mechanics

Identify and apply relevant mathematical formulas and techniques to solve basic problems related to marine mechanics

Identify and interpret numerical and graphical information and perform mathematical calculations to determine resultant and equilibrant of coplanar forces linear and angular velocity and hoop and longitudinal stress in thin walled pressure vessels

Identify collate and process information required to perform basic calculations related to marine mechanics

Impart knowledge and ideas through verbal written and visual means

Read and interpret written information needed to perform basic calculations in marine mechanics

Use calculators to perform mathematical calculations

Required Knowledge

Centre of gravity

Conservation of energy theorem

Factor of safety

Force

Joint efficiency factor

Laws of motion

Momentum

Nature and laws of friction

Pressure vessels

Stress and strain

Thin cylinder theory

Types and uses of simple machines

Work health and safety WHSoccupational health and safety OHS requirements and work practices

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria the required skills and knowledge the range statement and the Assessment Guidelines for the Training Package
Critical aspects for assessment and evidence required to demonstrate competency in this unit	The evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the Elements Performance Criteria Required Skills Required Knowledge and include performing accurate and reliable calculations solving problems using appropriate laws and principles
Context of and specific resources for assessment	Performance is demonstrated consistently over time and in a suitable range of contexts Resources for assessment include access to industryapproved marine operations site where basic principles of marine mechanics can be applied diagrams specifications and other information required for performing basic calculations related to marine mechanics technical reference library with current publications on basic marine mechanics tools equipment and personal protective equipment currently used in industry relevant regulatory and equipment documentation that impacts on work activities range of relevant exercises case studies andor other simulated practical and knowledge assessments appropriate range of relevant operational situations in the workplace In both real and simulated environments access is required to relevant and appropriate materials and equipment applicable documentation including workplace procedures regulations codes of practice and operation manuals
Method of assessment	Practical assessment must occur in an appropriately simulated workplace environment andor appropriate range of situations in the workplace A range of assessment methods should be used to assess practical skills and knowledge The following examples are appropriate to this unit direct observation of the candidate applying basic principles of marine mechanics direct observation of the candidate applying relevant WHSOHS requirements and work practices
Guidance information for assessment	Holistic assessment with other units relevant to the industry sector workplace and job role is recommended In all cases where practical assessment is used it should be combined with targeted questioning to assess Required Knowledge Assessment processes and techniques must be appropriate to the language and literacy requirements of the work being performed and the capacity of the candidate

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below.
Simple machines may include:	Hydraulic jack Pulley blocks Reduction gears Screw jack Single and double purchase crab winches Warwick screw Wheel and axle Worm driven chain blocks

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