faculty of mathematics and physicsuniversity of ljubljana spicy physics aleš mohorič, sergej...
Post on 24-Dec-2015
224 Views
Preview:
TRANSCRIPT
Faculty of mathematics and physics University of Ljubljana
Spicy physics
Aleš Mohorič, Sergej Faletič
Faculty of mathematics and physicsUniversity of Ljubljana
Recipe to improve physics teaching:
• knowledge.........a lot• enthusiasm........planty• ICT.....................teaspoon (as a spice)
Examples of ICT use: • personal respond system (PRS or “clickers”)• electronic sensors with computer interface• e-learning portal www.nauk.si
PERSONAL RESPONSE SYSTEM
“CLICKERS”
Familiar?
me, me...
her, her...
Solution?
Brief, multiple-choice questions
Immediate analysis by electronic responders
Basic rules in clicker use
• explain the procedure• explain the handling with clickers• emphasize the anonymity of responses• activity begins with an experimental question• read the question aloud before seting up the timer• the display shows a histogram of responses
• test existing knowledge• verify the effectiveness of homework• test recall of lecture point• choose the next step in a complex calculation• reveal pre-existing perception• check conceptual understanding • use of the concepts in a new context• predict the results of the experiments, simulations, video, etc..• compare various representations (graphical,
mathematical, ...)
Purpose of questions
Procedure
• question • vote• peer discussion• vote • whole-class discussion
Basic rules in clicker use
• do not reveal the correct answer• if the majority of students chose the correct answer,
volunteer explains the correct answer and why other are wrong
• for uneven distribution of responses, the students discuss the question in pairs, after a few minutes, repeat vote
• representatives of specific groups (in terms of representation of responses) explain why they chose the selected answer (it is better if we start with the group who chose the wrong answer)
Basic rules in clicker use
• at the end tell which answer is correct• why is it correct (explanation)• why the other answers are incorrect• summarize the explanations of students• thus recognizing students and encourage them to
continue to participate in the discussion • teachers should be sensitive and open to any
criticism that students give to each question
Poor use of clickers• solely for taking attendance• for quizzes or high-stakes testing• only occasionally, or at set times
Better use of clickers• integrated into lecture, frequent• require or encourage peer instruction• mix of difficulty• generous credit for any answer• low grade impact (~2%)
Poor Concept Tests• merely test recall• involve blind application of formula/recipe• involve many numbers
Better Concept Tests• check qualitative understanding (no calculator)• apply familiar skills in new contexts• multiple questions to lead thru multi-step reasoning• test a learning goal
Calculate the current in 2 ohm resistor and potential difference between P and Q
When S is closed, what happens to:(a) intensities of A and B?(b) intensity of C?(c) current through battery?(d) potential difference acrossA, B, and C?(e) the total power dissipated?
Some considerations
• too easy questions seen as a quiz (entertainment)
• may mislead students for the test
• challenging questions are most useful for learning
• order is important: start easy, hard in the middle, end easy
• 4-6 options for answer (min 3)
• the easiest way: google “ConcepTests” (http://galileo.harvard.edu/http://www.mines.edu/Academic/physics/classroomcommunicators/assets/banks.html.)
Technicalities
• infrared (IR) clickers infrared (IR) clickers are cheaper than the radio are cheaper than the radio frequency (RF)frequency (RF) clickersclickers
• IRIR perform performance (ance (reception of responsesreception of responses, , longer longer minimum time between two receptionminimum time between two receptions, ranges, range, , handles onlyhandles only up to 30 up to 30 clickers clickers)) worse than RF worse than RF
• clickers with alclickers with alpha-numeric characters, pha-numeric characters, (not (not widespread)widespread)
• PRS is independent of presentationPRS is independent of presentation• up to the user to map presentation to PRSup to the user to map presentation to PRS
Examples
What is your age?
1) 10-20 yrs
2) 20-30yrs
3) 30-40 yrs
4) 40-50 yrs
5) 50-60 yrs
6) > 60 yrs
I have taken or taught a class that used clickers.
TRUE
FALSE
Examples
A box of mass m is held stationary against a vertical wall. There is friction between the wall and the box. The direction of the force of friction exerted on the box by the wall is...
(A) up
(B) down
(C) zero
(D) not enough information given to answer the question.
Examples
A toy car with mass m moves along a massless wooden plank lying horizontally over two support posts, as shown. The car is rolling across the bridge from point P2 to point P3,(left to right). What can you say about the magnitude of the net torque (i.e. the sum of all torques) about the point P1?(A) It is increasing.(B) It is constant, and zero.(C) It is decreasing.(D) It is constant, and non-zero.(E) Not enough information is given.
ACTIVITY:Write a clicker question
• pick a concept or skill you think is important and/or difficult for students.
• identify any common misconceptions to use as distractors.
• write the question as simply and clearly as possible.
ACTIVITY:Respond to histograms
A wrongB correct A correct
ELECTRONIC SENSORSAND
COMPUTER INTERFACE
Vernier LabPro interface
data-collection system- 4 analog channels, over 50 different sensors, (temperature, dissolved oxygen, gas pressure, pH, force...)- 2 digital channels (motion detectors, photogates, radiation monitors, rotary motion sensors, and drop counters)
Accelerometers Barometer
Blood Pressure Sensor
Charge Sensor
CO2 Gas Sensor
Colorimeter
Conductivity Probe
Current Probe
High Current Sensor NEW
Differential Voltage Probe
Digital Control Unit
Dissolved Oxygen Probe
Drop Counter
Dual-Range Force Sensor
EKG Sensor
Electrode Amplifier
Flow Rate Sensor
Force Plate
Gas Pressure Sensor
Vernier GPS Sensor NEW
Garmin® GPS Units
Gas Chromatograph NEW
Hand Dynamometer
Hand-Grip Heart Rate Monitor
Instrumentation Amplifier
Ion-Selective Electrodes Light Sensor
Magnetic Field Sensor
Microphone
Motion Detectors O2 Gas Sensor
Ohaus Balances
ORP Sensor
pH Sensors
Photogate
Power Amplifier NEW
Digital Radiation Monitor
Relative Humidity Sensor
Respiration Monitor Belt
Rotary Motion Sensor
Salinity Sensor
Sound Level Meter
Soil Moisture Sensor
Spectrometers
Spirometer
Temperature Probes Thermocouple
Turbidity Sensor
UV Sensors
Voltage Probe
Watts Up Pro NEW
Wireless Dynamics Sensor System
Technicalities
• Lab Pro interface, USB• Logger Pro software• one licence per school• sensors sold separately
Innovative uses
• high CO2 levels putting you to sleep?• investigating periodic trends• spectral analysis of fireflies• how do you dim an LED?• showing speed and location in Google maps• test hearing response with labquest• studying the diving reflex in the laboratory
http://www.vernier.com/innovate/index.html
ACTIVITY
motion detection / graphical representation
plot a graph x(t) or v(t) and try to repeat it!
E-LEARNING PORTALNAUK
www.nauk.si
e-learning portal www.nauk.si
GOALS:
• active students• didactical recommendations• feedback• fresh, everyday cases• include measurements
Advantages
• adjust the level based on responses• union of peer-instruction and self-learning• simulation and playing based learning
• disengaging the reality• overuse of ICT saturates students• e-learning is effective only for intro courses
Disadvantages
Types of material
• multiple choice questions• context rich exercises
Multiple choice questions• graphic material, • real context, • multilevel responses – hints/solutins• adjustable number of repetitions• record of succes rate• variation of answers• different answer modes
Context rich exercises
wrong
wrong
correct
...end
• central story with special cases • modular composition• graphic material• real context, • multilevel responses – hints/solutins• “exploring the landscape”• analysis of measurements
Tools
• reading the graphs• measuring distances, angles• ploting lines, vectors, curves• sky map• linking...
Example
Odboj teniške in žonglerske žogicehttp://www.nauk.si/materials/258/out/index.html#state=1
e-nauk
ACTIVITY
• open source• do it yourself• wiki type syntax...
• write a multiple choice question• write a scenario for a context rich exercise
top related