p111_lecture8

p111_lecture8 - Chapter 4 Forces and Newton’s Laws of...

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Unformatted text preview: Chapter 4 Forces and Newton’s Laws of Motion 4.6 Types of Forces: An Overview Examples of Nonfundamental Forces-- All of these are derived from the electroweak force: normal or support forces friction tension in a rope 4.8 The Normal Force Definition of the Normal Force The normal force is one component of the force that a surface exerts on an object with which it is in contact – namely, the component that is perpendicular to the surface. For a block of weight W sitting at rest on a table, from Newton’s 2 nd law: Σ F y = F N- W = ma y = 0 --> F N = W , and is directed upward Weight is the downward force exerted by gravity on an object. 4.8 The Normal Force N 26 N 15 N 11 = = ! ! N N F F N 4 N 15 N 11 = = ! + N N F F Σ F = F N + F H + W = 0 4.8 The Normal Force The weight , W , of an object can be associated with its mass , m , using Newton’s 2 nd law: +y m W a y = -g Σ F y = -W = ma y = m (-g )--> W = mg 4.8 The Normal Force Apparent Weight The apparent weight of an object is the reading of the scale....
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p111_lecture8 - Chapter 4 Forces and Newton’s Laws of...

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