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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.
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
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
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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