Wright State University Lake Campus/2015-9/Phy2410

Phy 2410 Fall 2015

• #Links at bottom

Tue 9/1

Lab: Go through syllabus, expecially lab attendance

Help students in HTW: b:FHSST Physics/Rectilinear Motion/Graphs

Do question 3 of: How things work college course/Motion simple arithmetic quiz

Lecture:

Physics equations/07-Work and Energy/Q:lineIntegral

time permitting, look at How Things Works quiz.

Thu 9/3

1. Learn how to navigate Wikiversity through links on Pilot
2. Learn about the Millikan Oil Drop experiment through the internet

• I am especially interested in the forces on the oil drop

Learn about and edit your Presidental Sandbox

• User:Guy vandegrift/sandbox/03/Presidental sandboxes
• This course (Fall 2410) uses sandbox 3
• Get your president from the signup sheet for today's lab.
• Your lab "report" is to write "hello world" (or something else) in your Presidental Sandbox.

1. Click the link, if it was red you get a "create page" banner that you can ignore.
2. Write something and go to the bottom of the page
3. Type anything into the Edit Summary and Save.
4. Oral reports (in groups) will occur at the next lab (Tuesday)

Tue 9/8

Lecture

Labs

AM Lab: learn about the Millikan Oil drop experiment. Write your report in the pres. sandbox. Use page for figures and equations. Focus on these four topics:

Electric Field  ---- Force --- Charge ---Voltage

Explain the equation Electric field * distance *cos(angle) = change in voltage

Another word for voltage is electric potential

Thu 9/10

Go to

• Physics_and_Astronomy_Labs/Uniform_acceleration_tapping_basketball_with_spitwads#Calculus_physics

Instructions from that page

1. Write a one or two sentence summary of what you thought the the "How Things Work" folks did. Do not copy/paste their words unless you are confident you understand what they wrote.
2. measure the slope with an uncertainty in the figure by hand. Keep in mind that "uncertainty" usually means one standard deviation, suggesting that typically 68% of the data points fall within your range.

• Repeat using Excel and/or Matlab

1. Explain the formulas governing this. Use pencil and paper on equations and sketches. Put words into sandbox, referencing the equations and sketches.

Tue 9/15

With your clumsy hand, hold to linear filters crossed, to block the light. Use your clever hand to insert the 45 degree polarizer in between.

• Explain this effect

Assume knoledege of

• Electric field for linearly polarized light.
• Component of a vector along a unit vector >${\hat {u}}$ or ohter symbol

There is no need to cover this topic on Wikiversity because it is explained in many places. To name just a few:

• w:Polarization_(waves)#Polarization_state seems to be the most appropriate Wikipedia article
• Khan Academy: Polarization of light-linear and circular
• Physics Classroom - Polarization

Tue 9/22

Test review. No lab.

Thu 9/24

Test Review. No lab.

Tue 9/29

Ray optics 1

Thu 10/1

Ray optics 2

Tue 10/6

Ray drawings at

http://dev.physicslab.org/DocumentPrint.aspx?doctype=2&filename=GeometricOptics_ConvergingLensDiagrams.xml

next time: We already did the three polaroid filters. But we have not yet done:

1. diffraction
2. diagram on how a single polarizing filter works.

• See Bell's theorem/Introduction#Lab_activity and [[]]

Tue 10/13

Complete the ray drawing. The object is to your left. The first lens is convex (converging) and the second lens is concave (diverging). The focal points are shown as points.

1. Measure the focal lengths of both lenses and write them down (in cm = centimeters)
2. Measure the distance between the lenses and write that in cm.
3. Measure the distance from the object to the first (converging) lens.
4. Measure the height of the object.
5. Complete the ray diagram for the first image, using only the converging lens.
6. Measure the distance from the first lens to the image (cm) and also measure the height of the image.
7. Now make this image the new object and calculate it's image using the diverging lens.
8. How tall is the final image?
9. How far is the final image from the diverging lens?
10. Now do the calculation using the thin lens formula and the numbers you obtained in steps 1-4

Tue 10/20

Continue with Physics and Astronomy Labs/Optics: Human eye model (Pasco)

• Front two groups put eye on metal cart when done.
• All groups place water-filled eye in leak-proof container.
• Recorded distance measurements between object and lens, between lens and image as well as image size.

Tue 11/3

phet circuit construction kit

Define voltage: V (volts or V as units)

• Voltage is defined as a difference that exists between two points.
• A voltage difference tends to "push" electrons through a wire.
• On a roller coaster PE=mgh. Voltage, V, is "like" gh and charge, q, is "like" m.

Electric potential energy in Joules (J) is PE = U =

There is another analogy: Voltage is "like" pressure in a system of pipes carrying water.

Define current: I = dq/dt (amps or A)

State Ohm's Law: V = IR (volts or V)

Thu 11/5

• Power = IV = dU/dt where U is energy. (Power is watts or Joules/second)
• The voltage across a battery usually drops if the terminals are connected to a circuit (but not in the case of an "ideal" voltage source)
• Class sketches the simplest possible graph of V versus I if V = 9 volts when I = 0, and V starts to gradually drop as current is drawn. On your graph, sketch the ideal situation as a dotted line.

1. Make your "model" as simple as possible by drawing it as a straight line.
2. Estimate magnitude of slope and include units.

Tue 11/10

Find power versus load resistance and for an emf of 9 volts and an internal resistance of 0.7 Ohms. Most efficient is to use P = V^2/R.

phet circuit construction kit

Links at bottom

• get date
• OpenStax College/University Physics
• Physics_equations/Sheet/All_chapters
• Pilot (course management system) (See Wikipedia:Course Management System)
• Presidental sandboxes

Final exam study

a18ElectricChargeField_findE	1
c18ElectricChargeField_lineCharges	1
c19ElectricPotentialField_GaussLaw	1
a19ElectricPotentialField_KE_PE	1
c19ElectricPotentialField_SurfaceIntegral	1
c20ElectricCurrentResistivityOhm_PowerDriftVel	1
a21CircuitsBioInstDC_circAnalQuiz1	1
a21CircuitsBioInstDC_circuits	1
a21CircuitsBioInstDC_RCdecaySimple	0
c22Magnetism_ampereLaw	1
c22Magnetism_ampereLawSymmetry	1
a22Magnetism_forces	1
a23InductionACcircuits_Q1	1
c24ElectromagneticWaves_displacementCurrent	1
a25GeometricOptics_image	1
a25GeometricOptics_thinLenses	1
a25GeometricOptics_vision	1