Delayed due to snow.
[scheduled:: 2025-01-13]
Measurement, Precision, and Accuracy
Links and useful resources
- START HERE: Physics 2024 class outline
- Handwritten math converter
- IXL science grade 8 (some physics skills)
- OpenSTAX high school physics
- NotebookLM physics notebook
- Physics projects
- Physics classroom online interactive tools
- AP Physics 1 Dan Fullerton videos
Lesson-specific resource links
Lab setup
Measuring volume with displacement
- Graduated cylinder
- Metal d6
- metal d4
- glass marble
- dense objects to check
- Volume of sphere
- Volume of cube
- Volume of tetrahedron
Procedure:
- Compute the volume of each object with the formula
- Measure the volume with displacement method, 5 measurements each
- Compare results
Measuring distance
- Measure three of my setup blocks, in cm
- Use ruler, meter stick, and calipers
- Compare to exact known value.
- One inch is exactly 2.54 cm by definition
Problems encountered
- Our graduated cylinder's finest measurement was 1 mL, but the objects were on the order of 1-3 mL so the tool lacked resolution
- Using the volume formulas requires you to pay close attention to units
- Density is a derived unit, you have to measure separate properties of volume and mass before you compute the density
Concept summary and connections
- precision vs accuracy
- measurement error
- when multiple measurements improve accuracy
- lab notebook format
- Significant figures
- All certain digits plus one doubtful
Media resources
- Youtube search for "precision vs accuracy"
- Youtube search for "measurement error"
- Youtube search for "when multiple measurements improve accuracy"
- Youtube search for "lab notebook format"