G A P between Mathematics and the Physical Sciences
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1 the G A P between Mathematics and the Physical Sciences Tevian Dray & Corinne Manogue Oregon State University
2 Support Mathematical Association of America Professional Enhancement Program Oregon State University Department of Mathematics Department of Physics National Science Foundation DUE DUE DUE DUE
3 Support Grinnell College Noyce Visiting Professorship Mount Holyoke College Hutchcroft Fund Oregon Collaborative for Excellence in the Preparation of Teachers
4 Mathematics Physics Mathematics Physics
5 The Grand Canyon Mathematics Physics
6 What Are Functions? 2 2 T ( x, y) = k( x + y ) T ( r, θ ) =?
7 What Are Functions? Suppose the temperature on a rectangular slab of metal is given by: 2 2 T( x, y) = k( x + y ) Physics: Math: Tr (, θ ) = kr 2 2 Tr (, θ ) = kr ( + θ ) 2
8 What Are Functions? Math: T = f x y = k x + y 2 T = g( r, θ ) = kr 2 2 (, ) ( ) Physics: T = T x y = k x + y 2 T = T( r, θ ) = kr 2 2 (, ) ( )
9 Spherical Coordinates q: Radius α: Zenith (colatitude) β: Azimuth (longitude) Math: (ρ, φ, θ) Physics: (r, θ, φ)
10 The Bridge Project Small group activities Instructor s Guide Study Guide CWU, LBCC, MHC, OSU, UPS, UWEC Workshops
11 The Bridge Project Differentials Use what you know! Multiple Representations Symmetry Curvilinear coordinates and adapted bases Geometry Vectors; div, grad, curl;
12 Interactive Classroom
13 Lecture vs. Activities The Instructor: Paints big picture. Inspires. Covers lots fast. Models speaking. Models problemsolving. Controls questions. Makes connections. The Students: Focus on subtleties. Experience delight. Slow, but in depth. Practice speaking. Practice problemsolving. Control questions. Make connections.
14 Student Quotes I can't believe I thought it was possible to succeed in this class without doing the labs! (This student chose not to do the labs, dropped out, then retook the course.) The concepts are simple and powerful. You just have to think. Excellent! Five stars for learning and head-scratching value. Studying in a group is so important. Learned how to do problems in more than one way. Took awhile, but started to make sense at the end. (All of it.) Smile. I just want to mention that this lab section has been very valuable to my understanding of the material. Although I initially felt it would be ``just another thing to get done'', I now see it to be a very beneficial component to this course. I was very surprised that I knew more than I thought. Surprised by how much we had to recall from last week. This is a good thing. What I want to know is... Why does it always seem so obvious after the fact? I learned that math was all interlinked. I can list a whole lot of methods and theorems that all use different ideas, but the math ends up all the same.
15 Group Activities Task Master Cynic Keeps group on track: What you had for lunch doesn t seem relevant. Questions everything: Why? Why? Why? Recorder Reporter
16 Coriander 1. In the small town of Coriander, the library can be found by starting at the center of the town square, walking 25 meters north, turning 90 to the right, and walking a further 60 meters. 2. Magnetic north in Coriander is approximately 14 east of true north. If you use a compass to find the library (!), the above directions will fail. Instead, you must walk 39 meters in the direction of magnetic north, turn 90 to the right, and walk a further 52 meters.
17 Coriander Where on Earth is Coriander?
18 Coriander
19 Coriander Where on Earth is Coriander?
20 What Are Vectors? Mathematics: Triples of numbers v = v, v, v Physics: Arrows in space v = v ı + v j + v k 1 2 3ˆ
21 Do You Do This? u v = uv + u v + u v Or This? u v = u v cosθ u = u + u + u u v = u u v u u u
22 The Cube v u = ı + j + kˆ θ u v = kˆ u v cos( θ ) = = uv 1 3 Find the angle between a diagonal of a cube and an edge
23 The Cube Emphasizes that vectors are arrows Combines geometry and algebra Uses multiple representations geometry: algebra: memory: u v = u v cosθ u v = u + u + u k v + v + v k ( ı j ˆ )( ı j ˆ) u v = uv + u v + u v
24 Multiple Representations Flux is the total amount of electric field through a given area. Perpendicular Component Normal Vector Φ= E da E da E da over all rectangles
25 MAA Resources CUPM (MAA Committee on the Undergraduate Program in Mathematics Curriculum Guide CRAFTY (Subcommittee on Curriculum Renewal Across the First Two Years) Voices of the Partner Disciplines
26 Start with Algebra? u v = uv + u v + u v ( u v) ( u v) = u u + v v 2u v u v = u + v 2 uvcosθ θ u v u v (Law of Cosines)
27 Start with Geometry! v v u u u ( u + v ) w= u w+ v w ( ı j ) ( ı j ) u v u+ u + u v + v = uv + u v v w (get Law of Cosines for free!)
28 Use both! u v u = cos( α ) ı + sin( α ) j v = cos( β ) ı + sin( β ) j u v = cos( α β) (get addition formulas for free!)
29 Differentials Substitution 2xsinxdx 2 u = x du = 2x dx Chain Rule x = cosθ dx = sinθ dθ 2 u = x du = 2x dx = 2cos θ ( sin θ dθ)
30 Vector Differentials r + dr r dr
31 Vector Differentials dy dr dr dx rdφ dr dr = dxıˆ+ dy jˆ dr = drrˆ + r dφφˆ
32 Vector Differentials Line Integrals F dr f ds ds = Surface Integrals dr Volume Integrals Gradient df F ds ds = dr dr 1 2 fds ds = dr dr 1 2 dv = ( dr dr ) dr = f dr 1 2 3
33 Mathematics Physics Physics is about things. Physicists can t change the problem.
34 Physics is about things What sort of a beast is it? Scalar fields, units, coordinates, time. Physics is independent of coordinates. Vectors as arrows, geometry of dot and cross. Graphs are about relationships of physical things. Fundamental physics is 3 dimensional. 3-d graphs of functions of 2-variables are misleading. Hills are not a good example of functions of 2 variables. Use of color. Fundamental physics is highly symmetric. Spheres and cylinders vs. parabolas. Interesting physics problems can involve trivial math. Adapted basis vectors, such as ˆ rˆ, θ, φ.
35 Physicists can t change the problem. Physics involves creative synthesis of multiple ideas. Physics problems not nec. well-defined math problems. No preferred coordinates or independent variables. No parameterization. Unknowns don t have names. Getting to a well-defined math problem is part of the problem. If you can t add units, it s a poor physics problem. Physics problems don t fit templates. Template problem-solving vs. skills. A few key ideas are remembered best later. Physics involves interplay of multiple representations. Dot product.
36 Visualization Table
37 Visualization Level Curves f(x,y)=50-x^2-y^ f(x,y) y x
38 Visualization Graph f(x,y)=50-x^2-y^ f(x,y) y x
39 Visualization Gradient
40 Goals Mathematics Visualization Arbitrary surfaces 2-d primary Sophistication now Domain is important End of course flexible Physics Visualization Simple surfaces 3-d primary Sophistication later Surface is important End of course fixed
41 Simple Curriculum Additions Equations describe the relationships between physical quantities. Integrals involve chopping a part of space and adding up a physical quantity on each piece. Limits (and approximations) require one to say what dimensionless quantity is small.
42 Context Rich Problems Just as you turn onto the main avenue from a side street with a stop sign, a city bus going 30- mph passes you in the adjacent lane. You want to get ahead of the bus before the next stoplight which is two blocks away. Each block is 200-ft long and the side streets are 25-ft wide, while the main avenue is 60-ft wide. If you increase your speed at a rate of 5-mph each second, will you make it? (No Picture) Patricia Heller and Kenneth Heller, University of Minnesota
43 A Radical View of Calculus The central idea of calculus is not the limit. The central idea of derivatives is not slope. The central idea of integrals is not area. The central idea of curves and surfaces is not parameterization. The central representation of a function is not its graph.
44 A Radical View of Calculus The central idea of calculus is the differential. The central idea of derivatives is rate of change. The central idea of integrals is total amount. The central idea of curves and surfaces is use what you know. The central representation of a function is data attached to the domain.
45 Summary Geometric visualization is the key to bridging the gap between mathematics and the physical sciences.
G A P between Mathematics and the Physical Sciences
the G A P between Mathematics and the Physical Sciences Tevian Dray & Corinne Manogue Oregon State University http://www.math.oregonstate.edu/bridge Support Mathematical Association of America Professional
More informationG A P between Mathematics and the Physical Sciences
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