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ME 242 Lecture 9 02.09

ME 242 Lecture 9 02.09 - ME 242 Dynamics February 9 2009...

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1 ME 242 Dynamics February 9, 2009 Eric Wang Today’s Key Concepts Chapter 3: Kinetics of a Particle Newton’s 2 nd law: In Cartesian Coordinates F = d dt mv ( ) Newton’s 1st Law: A body at rest, will remain at rest unless acted on by a non-zero net force (a body moving in a straight line will continue in a straight line). F = F 1 + F 2 + F 3 = 0 Newton’s 2nd Law: When a body is acted upon by a non-zero net force, the net force is equal to the time rate of change of the body’s linear momentum F = d dt XYZ mv ( ) Newton’s 3rd Law: For every action, there is an equal and opposite reaction Newton’s 2nd Law: For constant mass system: F = d dt XYZ mv ( ) F = ma
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2 Cartesian Coordinates Drop the sign with the understanding that we always mean the sum F = ma F x = ma x = m ˙ ˙ x F y = ma y = m ˙ ˙ y F z = ma z = m ˙ ˙ z Vector form
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