Title: TASK: Quantities needed in the world of work and everyday life, measurement accuracy
Course: Physical and chemical phenomena and their application > Section: Units and quantities

Write your response in the text box or return as a file.

1. What is the SI system? Explain the main points of it (base units, prefixes).

2.  Why should we use the SI system?

3. Which measurements are important in your professional field?

4. What measuring instruments are used in your professional field?

5. List some quantities in your professional field.

Also write the quantity symbol, the unit in the SI system, and the unit symbol.

6. Five friends went for a bike ride. Each of them had their own speedometer, which showed the following readings: 15.1 km, 15.34 km, 15,740 m, 15.00 km, and 14.95 km. The bike ride took 35 minutes.

 a) What kind of

   quantities:

   units:

can you find in the example above?

b) What number would you report as the distance based on these measurements?

7.  You have three measurements taken with similar scales: 5,01 g, 4,99 g, and 5,02 g. The true mass is 5,00 g.

a) Are the measurements accurate?

b) What could you do to improve the accuracy of the measurements?

8. Imagine that a laboratory device consistently gives a result that is 2% higher than the true value. Additionally, you notice that the measurement results vary by ±0,5% each time.

a) What is the systematic error in the measurement results?

b) What is the random error in the measurement results?

c) How can you reduce the impact of both errors?