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Unformatted text preview: Lecture 2 Purdue University, Physics 220 1 A. 10 am Friday B. 10 am Saturday C. 10 am Sunday D. 11 pm Sunday I want my homework to be due by: Lecture 2 Purdue University, Physics 220 2 Lecture 02 Motion, Forces, and Newton’s Laws Textbook Sections 2.22.4 PHYSICS 220 • Mechanics is the area of physics which is concerned with the motion of objects. • Two questions need to be answered to understand mechanics – What causes motion? – Given a particular situation, how will an object move? Definition of Motion • Concepts needed – Position – Velocity – Acceleration • The average velocity is the change in position (vector) divided by the change in time. v av = ∆ x ∆ t = x f x i t f t i Lecture 2 Purdue University, Physics 220 4 • Which plot represents an object at rest? • Which plot represents an object with a uniform velocity in the x direction? Question x x x x t t t t Lecture 2 Purdue University, Physics 220 5 Find the average velocity for the object during the period t=5 s and t=6 s v= x f x i t f t i = 1 m 6 m 6sec 5sec =  5 m 1sec =  5m/sec Exercise Lecture 2 Purdue University, Physics 220 6 Velocity vs Speed • Velocity is a vector – Only depends on the displacement between the initial...
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This note was uploaded on 02/05/2012 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue University.
 Spring '09
 CHANG
 Force, Work

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