C:\My Docs\3504\ME3504_S_2012\Syllabus\Handouts 2012\Laws of Mechanics_units_memo_S_2012.doc Page 1 of 6 ME 3504/3514 Vibrations / Systems Dynamic R. G. Kirk 8-26-99/ S 2012 Laws of Mechanics1. Newton's 1stLaw: Definition of Momentum, vm. A body at rest or in motion will remain at rest or in motion unless acted upon by some external force. 2. Newton's 2ndLaw: Definition of force (or torque). The sum of all external forces acting on a body equals the body's time rate of change of momentum. JdtdJJdtdTdtvmdFtorsionfor ;)(If mass is constant with time amdtvdmF3. Newton's 3rdLaw: For every action, there is an equal and opposite reaction. (Use this to build up system components into system equations of motion.) 4. Newton's 4thLaw: Mass attracts mass. Definition of weight. 2RmmWbaWeight of body for engineering calculation taken as mggWmgWc1or
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