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1 ALL MATTER IN THE UNIVERSE IS MADE OF VERY SMALL PARTICLES
- Theory
- TASKS
- 3.1 We observe and study substances
- 3.2 Water is not only for drinking
- 3.3 The air around us
- 3.4 Metals in our life
- 3.5 Light
- 3.6 Physical qualities (volume, force, time, weight)
- Task 1: Measure the volume of liquid, powdered and solid substances with a graduated cylinder made of a PET bottle
- Task 2: Measure the volume of the lungs by so-called spirometer made from a PET bottle
- Task 1: Make a scale from a ruler
- Task 1: Make a paper sundial
- Task 2: Make a paper sundial in the garden
- Task 1: Make a dynamometer for measuring the tension force
- Task 2: Make a dynamometer for measuring the press
- WORKSHEETS FOR PUPILS
- Workshops
- Task 1: Measure the volume of liquid, powdered and solid substances with a graduated cylinder made of a PET bottle
- Task 2: Measure the volume of the lungs by so-called spirometer made from a PET bottle
- Task 1: Make a scale from a ruler
- Task 1: Make a paper sundial
- Task 2: Make a paper sundial in the garden
- Task 1: Make a dynamometer for measuring the tension force
- Task 2: Make a dynamometer for measuring the press
Task 1: Make a scale from a ruler
Attach a string with a bowl to the end of a ruler (you can make the bowl for example from a cardboard), and fix the other end of the ruler to the table by the clamp. Place a sheet of paper vertically so that you can plot the scale (Fig. 6). Place weights of known weights on the weighing bowl and record the deviation of the ruler with the numerical weight on the paper. Determine the weight of various items on the constructed scale. Check the accuracy of the measured values with digital scales.
Pic 9: A scale made of a ruler.
Questions:
- What makes the range of the constructed scale? (The maximum weight is given by the ruler‘s strength.)
- How can we increase the scale sensitivity? (We can increase the sensitivity by using a longer ruler.)
- How can we increase the scale range? (We increase the range by shortening the ruler or by placing two or more rulers on each other.)