Before revision: Project management – Pulley – Pump – Q Quality – Quality control – Quality assurance – R Rack and pinion – Rack railway – Railcar – Rail gauge – Railroad car – Railroad switch – Rail tracks – Random vibration – Reaction kinetics – Rear wheel drive – Refrigeration – Reliability engineering – Relief valve – RepRap Project – Resistive force – Resistor – Reverse engineering – Rheology – Rigid body – Robotics – Roller chain – Rolling – Rotordynamics – S Safety engineering – Screw theory – Seal – Second Law of Thermodynamics - states that when energy changes from one form to another form, or matter moves freely, entropy (disorder) in a closed system increases.
After revision: Rube Goldberg machine –Project management – Pulley – Pump – Q Quality – Quality control – Quality assurance – R Rack and pinion – Rack railway – Railcar – Rail gauge – Railroad car – Railroad switch – Rail tracks – Random vibration – Reaction kinetics – Rear wheel drive – Refrigeration – Reliability engineering – Relief valve – RepRap Project – Resistive force – Resistor – Reverse engineering – Rheology – Rigid body – Robotics – Roller chain – Rolling – Rotordynamics – S Safety engineering – Screw theory – Seal – Second Law of Thermodynamics - states that when energy changes from one form to another form, or matter moves freely, entropy (disorder) in a closed system increases.