Chapter3

# Chapter3 - Chapter 3 Demos:

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PHYS276, S09 Chapter 3 1 Chapter 3 Demos: http://www.physics.umd.edu/deptinfo/facilities/lecdem/lecdem.htm A2-21 magnetic vector board (a2-22 in big lecture hall) Thanks to Prof LaPorta and “Peer Instruction” by Eric Mazur

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PHYS276, S09 Chapter 3 2 Please pick up your graded quiz. The “ID” number that you will use to get your grades from the website is written in the red box. First exam is now 3 March
PHYS276, S09 Chapter 3 3 Chapter 3 Probably the most important chapter in this book, and the downfall of most people who fail to get a good grade in physics! If you ever do extra problems, do them for this chapter. Basic Mathematical Tools of Physics • review of trig • vectors

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PHYS276, S09 Chapter 3 4 Trig Review Worry if you don’t find this trivial… B opposite adjacent π /2 or 90 o
PHYS276, S09 Chapter 3 5 Test Yourself A person is in a city that has a grid road system. A person walks 300 ft on one road, turns left and walks 400 ft on another road. How far are they from where they began? 1) 500 ft 2) 700 ft 3) 350 ft 4) 100 ft 5) None of the above

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Test Yourself PHYS276, S09 Chapter 3 6 A person lays a ladder that is 5 m long against the side of a building so that the base is 1 m away from the wall. What angle does the ladder make with respect to the ground? 1) acos(1/5) 2) asin(1/5) 3) atan(1/5) 4) None of the above
more PHYS276, S09 Chapter 3 7 How far up the side of the wall does the top of the ladder rest? 5 2 1 2 = 4.9 m sin(78.5) = x / 5 4.9 m

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More Trig PHYS276, S09 Chapter 3 8 Radians versus degrees • radians is more natural for physics (since it relates arc length to radius) • degrees are more natural for calculators 90 o = π 2 180 = 360 = 2 θ = s r
PHYS276, S09 Chapter 3 9 Trig Review 2 Similar angles and parallel lines Worry if you don’t find this trivial…

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PHYS276, S09 Chapter 3 10 Test Yourself Which angle is the same as alpha? 1) A 2) B 3) C What is the relation between the two angles that are not equal to alpha to each other? To alpha?
PHYS276, S09 Chapter 3 11 Coordinate system review Worry if you don’t find this trivial… Cartesian versus polar

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PHYS276, S09 Chapter 3 12 If the polar coordinates of a point are (r, Φ )=(1m, 175 degrees from the direction of the x axis), which are true about the x-y components of this point? 1) Both are positive
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## This document was uploaded on 12/28/2011.

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Chapter3 - Chapter 3 Demos:

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