Choose from the following:
Galileo's Ramps - Can you dilute gravity to measure with homemade timing devices?
Phyphox - Go ahead make a sound. (2)
Pendulums and Gravity - by varying the length can you determine the accel of gravity?
Picket Fence
Event of your Own
IB Prescribed practicals
Included in the “Applications and skills” section of the guide is a series of practicals that students must cover either in a laboratory environment or as a simulation. The skills and general techniques associated with these common practicals may be assessed as part of the external assessment. The list of required practicals for physics includes:
Topic 2.1 - Determining the acceleration of free-fall
The data collected:
includes sufficient (a min of 5 data points x 3 trials) relevant quantitative and qualitative raw data that could support a detailed and valid conclusion to the research question.
Appropriate and sufficient data processing is carried out with the accuracy required to enable a conclusion to the research question to be drawn that is fully consistent with the experimental data.
Data processing that determines the relationship between variables by examining the trend-line of a graph, not simply performing calculations on each data point.
The processed data is correctly interpreted so that a completely valid and detailed conclusion to the research question can be deduced.
The focus of this summative practical report will focus on Error analysis
Using the following equipment, can you determine the acceleration of gravity?
Ramp (2m)
Burette (and appropriate stand)
Water
Balance / scale
Marble / Steel ball bearing / Cart
From determining the acceleration of a cart on ramps of 5 distinct angles, determine the acceleration of gravity.
Length or Height? Which measurement is most important when changing the angle of the ramp?
A basic assumption is that there is a relationship between the height (distance) an object falls and the amount of time. Galileo understood this but lacked the proper technology to accurately time elapsed when an object fell. Using the tech in your cell phone you can explore this phenomena.
Materials:
Phyphox phone app.
small dense object that can be tied to string and dropped repeatedly.
Trigger
Balloons - approx 20
metal ruler
Using a minimum of 5 heights determine the time fallen, determine the acceleration of gravity.
Determine Acceleration of Gravity - Pendulum: Using a pendulum, determine the acceleration of gravity using the appropriate equation(s). Using your social contacts, compare your results to those from another part of the Earth.
By varying the length of a pendulum the period of the swing will change. Because the force of gravity and tension are the only forces acting on pendulum, we can determine the acceleration due to gravity from the data.
Using a photogate and the Pendulum Setting to collect your data from the LabQuest. More info about the photogate HERE.
Using the picket fence and photogate, determine the relationship btwn time and distance fallen. Set your LabQuest or LoggerPro to Picket Fence data collection setting.
Add 5 different masses to the picket fence to determine the relationship btwn the mass of an object and the acceleration of the object due to gravity.
Use the PICKET Fence setting on your LabQuest or OPEN->EXPERIMENTS->PHYSICS WITH VERNIER-> 05 PICKET FENCE FREE FALL
Some materials we have collect data:
your phone with one of the following apps:
Stopwatches
Video record event (analyze in LoggerPro / Vernier Video Analysis App)
Ticker timers
Vernier Sensors:
Motion detectors
Photogates
Force Plates
Force Sensors
Rotary Motion Sensor
Equipment:
A multitude of spherical objects
Carts of various sizes and degrees of rolling perfection (friction).
2 air tracks with various gliders
Lots of other materials, just ask.
Playlist of 1.2 - Uncertainties and Errors.
1.4 - Uncertainty and Errors
I can define and compare the terms precision and accuracy
I can define and compare random and systematic error
I can report a measurement to the appropriate level of precision (decimal places)
I can report a measurement with the proper uncertainty for the instrumentation used
I can determine the number of significant digits in a reported value
1.5 - Uncertainty in Calculations
I can calculate the uncertainty of an average taken from repeated measurements
I can define and calculate absolute, fractional, and percent uncertainty
I can determine the uncertainty when adding or subtracting two numbers
I can determine the uncertainty when multiplying or dividing two numbers