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Unformatted text preview: Chapter 5: Forces and Newtons Laws of Motion Previously, we have studied kinematics, which- describes the motion of an object (x, v, a)- does not explain the cause of the motion Now, we begin the study of the second part of mechanics dynamics- which does address the cause of motion- that cause is a force , a push or pull Force, , is a vector, has magnitude and direction How forces affect the motion of an object is described by Newtons Laws of Motion (Newtonian Mechanics) Objects are treated as point particles; in Chapter 10 we will consider the shape of an object in more detail r F Newtons First Law of Motion An object at rest will remain at rest An object moving at a constant velocity will continue to move at the constant velocity, unless acted upon by a net force What does it mean?- tendency for an objects motion not to change Net force = the sum of all applied forces 3 2 1 = + + = i i F F F F r r r r- No effect on the motion r F 1 r F 2 r F 3...
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This note was uploaded on 12/10/2011 for the course PHY 1111 taught by Professor Stencil during the Fall '11 term at University of Georgia Athens.
- Fall '11