Tuesday, January 7, 2020

Using Physics to Design a Riffle - 2438 Words

The use of physics is incredibly important in design and engineering, I will be explaining how our knowledge of physics has helped us create machines suited to a purpose. For this example of the use of physics in design I am explaining the use of physics for the design of a rifle as it incorporates many important aspects of physics. I find this combination of intelligent design fascinating. It shows how our use of a complex and interesting subject as well as a certain degree of common sense has made it possible to create whatever we may need for any purpose. The oxford dictionary defines a rifle as a gun, especially one fired from shoulder level, having a long spirally grooved barrel intended to make a bullet spin and thereby have greater accuracy over a long distance. I will explain how physics makes these devices be made the way they are. An effective rifle needs to be efficient, efficiency is defined as [useful energy given off]/ [total energy in]. An efficient rifle converts as much of the chemical potential energy stored in the propellant into kinetic (movement) energy. For example for a .300 Hawk ammunition the energy use in percentage is: Barrel friction 2% Projectile Motion 32% Hot gases 34% Barrel heat 30% Unburned propellant 1%. Therefore the efficiency for this bullet in the gun it was fired is 32%. Using physics we can improve the efficiency by increasing barrel length this is because more propellant can be burned and as the bullet is in the barrel

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