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# lec05 - Physics 140 Fall 2007 lecture 5 18 Sep Mathematics...

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Physics 140 – Fall 2007 lecture 5 : 18 Sep Mathematics is the language of precise thinking. – Richard W. Hamming (1915-1998) Ch 4 topics: • Newton’s laws of motion (I + II) • dynamics: force and acceleration “Every body continues in a state of rest, or uniform motion in a straight line, unless it is compelled to change that state by outside forces impressed upon it.” In the “language of precise thinking”, we can say where ! F represents the sum of all external forces acting on an object with velocity v . A valid inertial reference frame is one in which objects move at constant velocity unless forced to do otherwise. ! F = 0 velocity v is constant Newton’s First Law: the Law of Inertia

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distance (called B in the figure) when hanging a frame by wire? What will happen to the tension measured by the spring scale when I attach the opposite end of the string to the other, identical “salami”? A. The tension will stay the same.
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lec05 - Physics 140 Fall 2007 lecture 5 18 Sep Mathematics...

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