Momentum is the resistance of an object to a change in velocity. Engineers use this concept to make our lives safer by designing products that will extend the time that deceleration occurs. For example, engineers developed the airbag. When the car's computer detects excessive deceleration, the airbag deploys, gradually changing the momentum of the head. A change in momentum over a longer period of time reduces the force on the body. Therefore, people will not be harmed. Another knowledge of physics that engineers benefit from is kinetic energy. Kinetic energy is the lifeblood of mechanical engineering, a field where machines have dozens of moving parts that control their energy output. There are some cases where kinetic energy touches the ME industry. For example, in mechanical engineering, like the rack in a steering system, you need to take into account the mass and velocity of an object to get the highest kinetic energy. As every mechanical engineer uses energy, there is also a branch specific to energy. This branch is also called energy engineer. Engineering applied to the energy sector focuses on improving the energy efficiency of machines, companies and homes. It also designs and operates fossil fuel, hydroelectric, conventional, nuclear and cogeneration power plants. They deal with all aspects of the production and conversion of energy from one form to another. Energy Engineers are all about reducing the world's energy consumption, saving energy through smart building designs, better use of materials and renewable energy devices. Energy can neither be created nor destroyed, only transformed from one form to another. An example of energy conversions engineered by engineers is the Conventional Car. Energy conversion sets in a conventional car primarily. Due to combustion, the chemical energy in the fuel is converted into the kinetic energy of the expanding gas. The kinetic energy of the expanding gas is then converted into linear piston motion. Linear piston motion is then converted into rotary crankshaft motion. The rotational motion of the drive wheels is converted into linear motion of the trolley.
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