1. Group Activity Measurement

2. Measure assigned objects with the use of the following devices:

3. 1 – foot/talampakan (length of a foot) 2 – cubit (distance from elbow to tip of middle finger) 3 – timuro (length of a forefinger) 4 – palm (width of four fingers excluding thumb) 5 – digit/dali (thickness of thumb) 6 – uncia (width of thumb) 7 – yard (distance from nose to the tip of middle finger 8 – dipa (distance from tip middle finger to tip of other middle finger) 9 – King’s foot (assign a king in your group)

4. Measurement and Quantities

5. Physical Quantity a quantity that can be measured consists of a numerical magnitude and a unit

6. Physical Quantity Fundamental Quantity DerivedQuantity

7. also called base quantity is a quantity that cannot be expressed in terms of other physical quantities International System (SI) of Units if a physical quantity is not in SI unit, it can be CONVERTed into SI unit.

8. Fundamental Quantity SI Unit Length, lmeter, m Mass, mkilogram, kg Time, tsecond, s Temperature, Tkelvin, K Current, Iampere, A Amount of substance, nmole, mol Luminous Intensity, Icandela, cd

9. 30 min = ? s

10. Derived Quantities are obtained from a combination of various fundamental quantities their units are determined from the relation between the fundamental quantities and the derived quantities

11. Derived Quantity SI UnitRelationship Aream2m2 length x width Volumem3m3 length x width x height Densitykg/m 3 mass/volume Velocitym/sdisplacement/time Accelerationm/s 2 velocity/time Force kg m/s or N mass x acceleration Pressure kg/m.s 2 or Pa force/area

12. 50km/h = ? m/s

13. Prefix Multiplying Factor Symbol nano-10 -9 n micro-10 -6 µ milli-10 -3 m centi-10 -2 c deci-10 -1 d kilo-10 3 k mega-10 6 M giga-10 9 G

15. Physical Quantity Scalar Vector

16. Scalar Quantity is a quantity which can be fully described by its magnitude Examples: speed, mass, time, length, density, energy and work.

17. Total work done by the girl in the picture is 50 J. The direction is not important to describe a scalar quantity.

18. Vector Quantity is a quantity which can only be described fully by its magnitude and direction Examples: velocity, weight, displacement, acceleration and momentum

20. Common Errors in Writing Units of Quantities POINT at the end of the unit ◦ min.m.kg. ---WRONG! Plural form of a unit ◦ mins.kgs.lbs.cms. amps. ---WRONG! Wrong abbreviation ◦ sec.mtr. ---WRONG!

21. Significant Concepts Scientific Notation Significant Figures

22. Conversion of Units 1 kg = 2.2 lb 1 in = 2.54 cm 1 yd = 3 ft 1 ft = 12 in 1 hr = 60 min 1 min = 60 s 1 d = 24 hr 1 mi = 1.609 km 1 byte = 8 bits

23. Convert the following quantities: 1) 0.005 kg = ____ lb 2) 1.0 GB = ____ bits 3) 2.50 km = ____ mi 4) 6 ft 1/2 in = ___ cm 5) 1 common year = ___ s 6) 220 lb = __ kg 7) 100,000 s = ___ d 8) 25 mi = ___ m