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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

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

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.
Simple machines include one or more of the following:	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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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying relevant work health and safety/occupational health and safety (WHS/OHS) requirements and work practices assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices identifying and applying relevant mathematical formulas and techniques to solve basic problems related to marine mechanics identifying and interpreting numerical and graphical information, and performing mathematical calculations to determine resultant and equilibrant of coplanar forces, linear and angular velocity, and hoop and longitudinal stress in thin walled pressure vessels identifying, collating and processing information required to perform basic calculations related to marine mechanics reading and interpreting written information needed to perform basic calculations in marine mechanics solving problems using appropriate laws and principles performing accurate and reliable mathematical calculations using a calculator.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

centre of gravity conservation of energy theorem effective verbal, written and visual communication strategies factor of safety force joint efficiency factor laws of motion momentum nature and laws of friction pressure vessels principles of marine mechanics stress and strain thin cylinder theory types and uses of simple machines WHS)/(OHS requirements and work practices.

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