physical quantity and measurement (part 1)
- 2. CONCEPTS IN MODULE INTRODUCTION VOLUME AND ITS MEASUREMENT CAPACITY AND ITS MEASUREMENT AREA AND ITS MEASUREMENT DENSITY AND ITS MEASUREMENT CALCULATION OF SPEED NUMERICAL PROBLEMS RECAPTULATION EVALUATION
- 3. INTRODUCTION
- 11. VOLUME OF IRREGULAR SHAPED SOLIDS
- 13. ACTIVITY-1 TO FIND THE VOLUME OF AN IRREGULAR SHAPED SOLID USING A MEASURING CYLINDER (DISPLACEMENT METHOD)
- 17. 1. Find the volume of a rubik’s cube of length 4cm. Solution: Given a = 4 cm volume of the cube = a× a × a = (4x4x4) cm³ = 64 cm³ 2. Find the volume of a spherical marble with radius 2cm. Solution: Given r = 2 cm volume of the sphere =V = 4/3πr3 = 4/3 x 3.14 x r x r x r = 4/3 x 3.14 x 2 x 2 x 2 cm³ = 33.49 cm³
- 19. “ ” https://www.youtube.com/watch?v=Tk Xxn0bJ4r0 The maximum amount of matter a container can hold is capacity The units: 1. litre 2.mililitre 3.kiloliter Measuring jar cylinder syringe Name of the unit symbol Measures kiloliter kl 1000 times of a litre mililitre ml 1/1000
- 21. Area is the measure of surface occupied by a body.
- 22. AREA OF AN IRREGULAR SHAPE ACTIVITY (TO FIND THE SURFACE OF A LEAF)
- 23. “ ” The area of irregular shape cannot be determined easily just by using the formula for area of the regular shaped object.
- 25. Area covered No. of squares Area (cm²) Fully - filled Half - filled More than half- filled Total Area = _____________________cm² Result: Area of the irregular shape = __________________ cm²
- 28. FORMULA
- 29. UNIT OF DENSITY
- 30. ACTIVITY TO UNDERSTAND THE MEANING OF DENSITY
- 33. DENSITY g/cm3 Aluminium 2.70 Brass 8.50 Iron 7.86 Wood 0.50 Slate 2.80 Glass 2.50 Lead 11.3 Marble 2.70 Wax 0.89
- 34. Conclusion case1: 1.Substances of equal masses need not be of equal volumes. Case2: 2. substances of equal volumes need not be of equal masses.
- 35. NUMERICAL PROBLEMS (BASED ON DENSITY)
- 36. 1. Calculate the density of a substance whose mass is 500g and volume is 40cm³ Solution: Mass = 500g Density = mass/volume = 500/40 = 12.5 g/cm³ 2. Calculate the mass of a spherical object whose radius is 3 cm. The density of the object is 2g/cm³ Solution: Radius (r) = 3cm Density =2g/cm³ First we need to find the volume ; V = 4/3πr3 Volume = 113.04 cm³ Mass = density x volume = 2 x 113.04 = 226.08 g
- 39. UNIT OF SPEED
- 44. Units of time conversion chart are discussed here in hour, minute, second, day, week, month, and year. The standard units of time are 1 hour = 60 minutes 1 minute = 60 seconds 1 hour = 60 minutes = 3600 seconds (60 × 60) 1 day = 24 hours Units of Time Conversion Chart
- 45. RECAPTULATION
- 46. NUMERICAL PROBLEMS ON SPEED 1. A man walks 20 km in 4 hours. Find his speed. Solution: Distance covered = 20 km Time taken = 4 hours We know, speed = distance/time = 20/4 km/hr Therefore, speed = 5 km/hr 2. A distance of 6 km is covered by a two-wheeler in 8 minutes. What would be the speed of the car? Solution: Distance covered = 6 km Time taken = 8 min = 8/60 h We know, speed = distance/time = 6/ 8x60 km/hr Therefore, speed = 45 km/hr
- 47. POINTS TO REMEMBER VOLUME Key Takeaways: Volume is the three-dimensional space occupied by a substance. The International System of Units (SI) standard unit of volume is the cubic meter (m3). The metric system uses the liter (L) as a volume unit. One liter is the same volume as a 10-centimeter cube. CAPACITY Key Takeaways: The maximum amount a container can hold. The unit of CAPACITY are litre (l) , , mililitre (ml) kiloliter (kl) # 1000 mililitres = 1 litre. # 1000 litres = 1 kiloliter DENSITY The mass per unit volume is call density. • Heating and cooling changes the density of a substance. • Substances with equal masses need not be of equal volume. • Substances with equal volume need not of equal mass. • Density = mass/volume • SI unit of density is kg/m3
- 48. EVALUATION
- 49. OBJECTIVE TYPE QUESTIONS STATE TRUE OR FALSE Q1. Write true or false for each statement (a) The S.I unit of volume is litre. Answer: false The S.I unit of volume is cubic metre. (b) A measuring beaker of capacity 200ml can measure only the volume 200ml of a liquid. Answer: True. (c) cm2 is a smaller unit of area than m2. Answer: True (d) equal masses of two different substances have equal masses. Answer: False Equal volume of two different substances have different masses.
- 50. STATE TRUE OF FALSE (e) The S.I unit of density is g/cm3 Answer: False The S.I unit of Density is kg/m3 (f) 1 gm./ cm3 = 1000kg /m3 Answer : True (g) The density of water is maximum at 4 degree C Answer: True (h)The speed of 5 m./s is less than 25km/h Answer: True (I) The S.I unit of speed is m/s Answer: True
- 51. MATCH THE FOLLOWING COLUMN A A. Volume of a liquid B. Area of a leaf C. S.I unit of volume D. S.I unit of Density E. S.I unit of speed COLUMN B (i) kg/ m3 (ii) (j) m3 (iii) (k) graph paper (iv) m/s (v) Measuring cylinder
- 52. FILL IN THE BLANKS 1. The volume of an irregular solid is determined by the method of ____________________. 2. Volume of a cube = ________________ 3. The area of an irregular lamina is measured by using a ________. 4. Mass = ______________ 5. The S.I unit of density is ______________. 6. Distance travelled d = _______________. ------------------------------------------------------------------------ -- Answer : 1. displacement of liquid 2. a3 3. graph paper 4.density x volume 5. kg/m3 6. speed x time