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# notes5 - Chapter 5 Forces and Newtons Laws of Motion...

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Chapter 5: Forces and Newton’s 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 Newton’s 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

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Newton’s 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 object’s motion not to change Net force = the sum of all applied forces 0 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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