concepts and explanations

drag
drag force is also usually referred to as fluid resistance. it is a resistive fore i.e. it opposes the motion of an object in a fluid. this force is dependent on the velocity of the augment in a specific fluid.

ultimate tensile strength
it refers to the maximum strength of the material to resist elongation or shape change under tensile loading. the maximum point in an engineering stress strain graph of a material refers to the ultimate tensile strength of the material, beyond this point a cleavage starts to appear on the material.


sudden failures
sudden failure is also usually referred to as catastrophic failure. it the failure of a mechanical system without any warnings. such failure usually occurs either in brittle materials eg ceramics or in materials that turn brittle such as ht-9 steel due to hydrogen embrittlement. there is no sign of warning before a fracture takes place as there is no observable necking (in case of tensile loading)

engine
in engineering, engine refers to a machine with moving parts and a mechanism that converts energy into motion. the efficiency of an engine is the ratio of the useful output energy produced by the machine to the energy supplied.

brakes
brakes or braking mechanism is a mechanism responsible for slowing down or stopping an object in motion. the mechanism usually makes use of friction to slow down or stop a moving object.

forging
forging is the process of shaping a metal object usually by heating and then hammering.

inertia
inertia refers to the property of a body to resist any changes to its existing state of rest or continuous uniform motion. this property of a body directly depends on the mass of the body.

laser cutting
laser cutting is a process of cutting through materials using high power laser. the process essentially makes use of the heat produced by the laser to cut through the material. this process usually ensures high dimensional accuracy while cutting.

lubrication
lubrication usually refers to the process of oiling or greasing part or components in a mechanical system in order to reduce the friction between interacting components and hence reduce power loss and minimize wear and tear of the components.

overdrive
overdrive refers to a gear system that provides a greater output over input ratio  in terms of the rotations per minute as compared to direct drive (in a mechanical system), providing a boost in output speed(eg speed of a car on high speed roads) while reducing the speed of engine rotation.