Lecture06

Lecture06 - PHYSICS 149 Lecture 6 Chapter 2 2.7 Contact...

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PHYSICS 149: Lecture 6 Chapter 2 – 2.7 Contact Forces: Normal Force and Friction – 2.8 Tension Lecture 6 Purdue University, Physics 149 1

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ILQ 1 Lecture 6 Purdue University, Physics 149 2 If the distance to the moon were halved, then the force of attraction between the earth and moon would be: A) quartered (.25 x) B) halved (.5 x) C) doubled (2 x) D) quadrupled (4 x)
Normal (= Perpendicular) Force The normal force is a contact force perpendicular to the contact surfaces that prevents two objects from passing through each other. Normal force is a vector. – Direction: always perpendicular to the “contact surface” (rather than the horizon) – Magnitude: depends on the weight of the object (see different cases on next pages) Type: contact force (not a long-range force) Normal force is usually denoted by N . Lecture 6 3 Purdue University, Physics 149

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Normal Force Symbol for FBD: N Type: Contact force Direction is normal (perpendicular) to surface This is the normal component for the contact force between two (planar) surfaces Lecture 6 4 Purdue University, Physics 149