Unformatted text preview: Chapt. 5 Newton’s Laws and Dynamics I 49 005 qmult 00534 1 5 1 easy memory: Newton’s 2nd law class mantra 1 13. From here on in this course, a key thing to remember (to recite to yourself) when faced with any force problem is that Newton’s 2nd law ( vector F net = mvectora ) is: a) ALWAYS VALID . And it is a VECTOR equation, and so is always VALID component by component. And vector F net is the VECTOR sum of all forces acting on the body of mass m . It is not any particular force. If all the forces sum to zero vectorially, vector F net = mvectora = 0. If you are given the acceleration, then you can often use vector F net = mvectora to solve for an unknown force. b) ALWAYS VALID . And it is a SCALAR equation. And vector F net is the SCALAR sum of all forces acting on the body of mass m . It is not any particular force. If all the forces sum to zero, vector F net = mvectora = 0. If you are given the acceleration, then you can often use vector F net = mvectora to solve for an unknown force.to solve for an unknown force....
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 Fall '06
 Buchler
 Physics, Force, Fnet

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