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p111_lecture6 - Chapter 4 Forces and Newtons Laws of Motion...

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Chapter 4 Forces and Newton’s Laws of Motion
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4.1 The Concepts of Force and Mass A force is a push or a pull. Contact forces arise from physical contact . Action-at-a-distance forces do not require contact and include gravity and electrical forces.
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4.1 The Concepts of Force and Mass Force is a vector quantity (e.g. like velocity or acceleration). Arrows are used to represent forces. The length of the arrow is proportional to the magnitude of the force. 15 N 5 N
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4.1 The Concepts of Force and Mass Mass is a measure of the amount of “stuff” contained in an object. It is some “intrinsic property” of an object. mass weight --> discuss later
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Isaac Newton (ca. 1687) came up with three laws of motion which form the basis of (classical) mechanics. They describe the effects of forces on objects with mass . Let’s discuss each of the three laws separately:
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4.2 Newton’s First Law of Motion An object continues in a state of rest or in a state of motion at a constant speed along a straight line, unless compelled to change that state by a net force . The net force is the vector sum of all of the forces acting on an object. Newton’s First Law
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Newton’s First Law of Motion The net force on an object is the vector sum of all forces acting on that object. The SI unit of force is the Newton (N).
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p111_lecture6 - Chapter 4 Forces and Newtons Laws of Motion...

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