Mechanical Science KNEC notes

Introduction

Mechanical science introduces the trainee to the science applicable to the engineering field. Its aim is to equip the trainee with the basic concepts of engineering science. It is covered in the first stage of the course.

The instructional approach will emphasize on experiments, industrial visits and analysis of various engineering concepts.

Forces

• Definition
• Resolution of forces
• Statement and application of theorems

Moments

• Definition of a moment
• Principle of moments
• Calculation of moments and reaction on beams
• Couples
• Engineering examples

Friction

• Nature of friction
• Laws of dry friction
• Calculation of limiting friction force for a pull / push parallel to the surface
• Calculation of pull/push applied at an angle to the horizontal surface
• Definition of angle of friction
• Calculation of coefficient of friction

Motion

• Definitions
• Laws of motion
• Calculations of velocity, acceleration & distance covered
• Using graphs of velocity-time & displacement-time
• Relationship between linear and angular motion

Work Energy and Power

• Definitions of terms
• Calculation on work, energy and power

Machines

• Definitions
• Problems on simple machines
• Problems on levers
• Laws of machine

Gases

• Gas laws
• Engineering examples
• Simple problems

Heat

• Definition of heat
• Simple thermometer
• Heat capacity
• Definition of the latent heats
• Solve simple problems on heat

Density

• Definitions
• Simple measurements of density
• Archimedes principles
• Simple calculations

Pressure

• Simple calculations on pressure
• Simple barometer
• Applications of atmospheric pressure
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