Unit 3 Listen and Read:
Introduction to Engineering Mechanics
The state of rest and state of motion of the bodies under the action of different forces has engaged the attention of philosophers, mathematicians and scientists for many centuries. The branch of physical science that deals with the state of rest or the state of motion is termed as Mechanics. Starting from the analysis of rigid bodies under gravitational force and simple applied forces the mechanics has grown to the analysis of robotics, aircrafts, space crafts under dynamic forces, atmospheric forces, temperature forces etc. Sir Isaac Newton, the principal architect of mechanics, consolidated the philosophy and experimental findings developed around the state of rest and state of motion of the bodies and put forth them in the form of three laws of motion as well as the law of gravitation. The mechanics based on these laws is called Classical mechanics or Newtonian mechanics. Albert Einstein proved that Newtonian mechanics fails to explain the behavior of high speed (speed of light) bodies. He put forth the theory of Relativistic Mechanics.