Physics
01. Measurement of the density of solids
- 00:20 In which order should we place the columns? What independent variables are involved?
- 00:29 Where should the units go in a table?
- 00:34 Are we measuring mass or weight? What is the difference?
- 01:23 What is the point of a Vernier gauge? Why not just use a ruler?
- 01:34 Explain the difference between the terms ‘accuracy’ and ‘precision’.
- 01:43 How many significant figures should we use?
various regularly shaped solids both rectangular and circular
30cm ruler (resolution ± 0.1cm)
vernier callipers / micrometer (resolution ± 0.01mm)
balance (resolution ± 0.1g / 1g)
| Hazard | Risk | Control measure |
|---|---|---|
Pinching of skin by callipers |
Vernier callipers can cause nasty cuts if they close on fingers. |
Take care when holding callipers and wear gloves |
Continued, long term, ingestion of lead is toxic |
Ingestion of lead |
When handling materials such as lead, wear gloves wash your hands afterwards. |