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 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
14 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.
15 Coriander Where on Earth is Coriander?
16 Coriander Where on Earth is Coriander?
17 What Are Vectors? Mathematics: Triples of numbers v = v, v, v Physics: Arrows in space v = v ı+ v + v k 1 2 3ˆ
18 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
19 The Cube v u = ı+ + kˆ θ u v = kˆ u v cos( θ ) = = uv 1 3 Find the angle between a diagonal of a cube and an edge
20 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 ˆ )( ı ˆ) u v = uv + u v + u v
21 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
22 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
23 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)
24 Start with Geometry! v v u u u ( u + v ) w= u w+ v w ( ı ) ( ı ) u v u+ u + u v + v = uv + u v v w (get Law of Cosines for free!)
25 Use both! u v u = cos( α ) ı+ sin( α ) v = cos( β ) ı+ sin( β ) u v = cos( α β) (get addition formulas for free!)
26 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)
27 Vector Differentials r + dr r dr
28 Vector Differentials dy dr dr dx rdφ dr dr = dxıˆ+ dy ˆ dr = drrˆ + r dφφˆ
29 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
30 Mathematics Physics Physics is about things. Physicists can t change the problem.
31 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.
32 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.
33 Visualization Table
34 Visualization Level Curves f(x,y)=50-x^2-y^ f(x,y) y x
35 Visualization Graph f(x,y)=50-x^2-y^ f(x,y) y x
36 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
37 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.
38 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.
39 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.
40 Summary Geometric visualization is the key to bridging the gap between mathematics and the physical sciences. Faculty Workshop (NSF) Corvallis, OR, 6/25-29/05 (local funding available)
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
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