Lect04.Models.Ch2.Ch3 (1)

# Lect04.Models.Ch2.Ch3 (1) - Fall 2010 PHYS 172 Modern...

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Unformatted text preview: Fall 2010 PHYS 172: Modern Mechanics Lecture 4 – Physical Models, Fundamental Interactions Read 2.7–2.8, 3.1-3.4 Anouncements 1. Prof. Carlson's Office Hours: Tuesdays and Thursdays, 2:30-3:30pm, Room 279 (Note new time!) 2. Register your iClicker on CHIP! iClicker scores will be put in CHIP next week. 3. Homework due date extensions can be only requested before the official due date. Today •Poor Monkey •Reciprocity (Equal and Opposite Forces) •Example: Colliding Students •Four Fundamental Forces •Gravity… Lots of Gravity Shoot the monkey A) Below the monkey B) At the monkey C) Above the monkey (ignore air resistance) Don’t worry. The monkey had a bulletproof vest… Note : the trajectory is a parabola (if air friction is ignored) Clicker question: The hunter aims and shoots. As the bullet leaves the rifle the monkey sees the flash, releases the branch, and drops down in free fall. Where should the hunter aim to hit the monkey? Reciprocity: Newton’s 3rd Law Force magnitudes are the same Directions are opposite They act on different objects...
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Lect04.Models.Ch2.Ch3 (1) - Fall 2010 PHYS 172 Modern...

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