Physics131_L05WI10

# Physics131_L05WI10 - Physics 131 - Mechanics Le cture5 one...

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Physics 131 - Mechanics Lecture 5 one dimensional Motion January 15, 2010 Homeyra Sadaghiani

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October 24, 2010 Physics 131 - Lecture 3 2 Announcements HW#2 is due at 9 a.m. on Wed, January 20 th . Tutorial is due today! Make sure to register your clickers before Wednesday, so we can check on everyone’s registrations
Week Date L# Lecture topic Text reading HW 1 4-Jan 1 Description of course structure, SI units 6-Jan 2 Motion, position, velocity, acceleration 1.1-8 (26 P) HW#0 8-Jan 3 One-dimensional motion 2.1-3 (14 P) 2 11-Jan F1 Furlough (Constant acceleration -Tutorial)   13-Jan 4 Vectors 3.1-4 (13 P) HW#1   15-Jan 5 Constant acceleration   3 18-Jan H1 Holiday (Martin Luther King's Birthday)   20-Jan 6 Two- dimensional motion HW#2   22-Jan 7 Circular and relative motion 4 27-Jan 9 Newton’s first & second Law 5.5-7 (8 P) HW#3 29-Jan E1 EXAM 1- Chapters 1-4 October 24, 2010 Physics 131 - Lecture 3 3 Lecture Schedule We are here!

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You throw a ball vertically upward. The ball moves up, reaches its highest point, and finally falls down. Which of the following graphs best represents the ball’s acceleration and velocity vs. time during the process? Time v Time v Time a Time v Time a Time a Time v Time a A B D C 10020001v1_3 Clicker Question 1 October 24, 2010 4 Physics 131 - Lecture 3
Topics 2.5 Free Fall 2.6 Motion on an Inclined Plane Notes: Problem solving Thinking Graphically X and ΔX Example of same position on the graph (crossing lines) does not mean same velocity At turning point the instantaneous velocity is always zero + and –a does not mean speeding up and slowing down G “ free fall acceleration” is always positive and not “Gravity” and a y =-g October 24, 2010 Physics 131 - Lecture 3 5

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Demo 1:ME-C-WD: Strobed Water Drop 1. Set up as shown. Attach rubber bands to the poles & to the hose to isolate the hose. 2. Set the variac to 70 volts 3. Turn on the pump and the strobotac. Adjust the strobotac to about 3500 rpm until the water drops appear to stand still in space. Extra lab stand, finger clamp, & foam core screen can be used to block background distractions. October 24, 2010 Physics 131 - Lecture 3 6
ME-C-FF: Free Fall Time NOTICE--Test this prior to use. If the timer doesn’t trigger, clean inside the brass contact (where the ball is placed) with a pencil eraser. 1. Clamp the ball in the bracket with the set screw.(See small set of instructions in the box) 2. Turn on and reset the timer. 3. Place the platform under the ball. 4. Measure the distance from the platform to the bottom of the ball, h. 5. Loosen set screw until ball falls onto the platform. 6. Read off the time, t. 7. Using the equation g = 2h / t2, calculate g. October 24, 2010 Physics 131 - Lecture 3 7 [ When h = 1 m, t = .452 ]

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October 24, 2010 Physics 131 - Lecture 3 8 Free Fall and g The picture shows an apple and a feather falling in vacuum with identical motions.
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## This note was uploaded on 10/24/2010 for the course PHY PHYSICS 13 taught by Professor Mylander during the Spring '09 term at Cal Poly Pomona.

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Physics131_L05WI10 - Physics 131 - Mechanics Le cture5 one...

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