Physics lesson.

Presentasi berjudul: "Physics lesson."— Transcript presentasi:

1 Physics lesson

2 Quantities and units Quantity tools Units Dimension 1 length ruler
Num Quantity tools Units Dimension 1 length ruler meter L 2 mass Balance kilogram M 3 time stopwatch second T 4 current ammeter Ampere I 5 temperature thermometer Kelvin Ө 6 Light intensity lightmeter candela J 7 Amount of matters mole N

3 Dimension is the symbol to show how a quantity is arranged from basic quantity
Dimension of Basic quantities: M, L, T, I, J, N and Ө Dimension of Derivative quantities Steps: 1. Find the formula 2. Find the units (basic quantity) 3. Find the dimension Example: Find the dimension of force the formula : F = m.a the units : = kg. m/s2 the dimension : = M. L/T2

4 Practice 1. Find the dimension of ; a. density b. kinetic energy
c. potential energy

5 Energi kinetik EK = ½ m.v2 = kg. (m/s)2 = M.L2.T-2

6 EP = m.g.h = kg. m/s2. m = M. L/T2. L = = M.L2.T-2

7 2. tentukan mana rumus yang benar
v = kecepatan h = ketinggian g = percepatan gravitasi

8 3. The law of gravity is FIND THE UNITS OF G ! Note: F : force m: mass
r : distance between the objects G : constant FIND THE UNITS OF G !

9 The function of Dimension:
1. Menentukan kesetaraan suatu besaran. 2. Menentukan kebenaran suatu rumus 3. Menentukan satuan dari konstanta

10 Scientific notation is the way to express smaller and larger number.
a x 10n with 1‹ a < 9 and n is the integer Example: = 3.6 x 10-5 = 7.68 x 107

11 Significant number is the number that gets from measurement
Significant number is the number that gets from measurement. Consist of exact number and one predict number. The rules All figures (but zero) are significant number (semua angka kecuali nol, adalah angka penting) Examples: gram (4 significant number) 4.57 cm (3 significant number) All zeros lie between non-zero figures are significant number. (angka nol diantara angka bukan nol adalah angka penting) Examples: m (5 significant number) 4.008 Kg (4 significant number)

12 3. All zeros number at the right hand side of non-decimal figure must be express in scientific notation or give a special explanation with underlined (semua angka nol disebelah kanan bilangan bukan desimal perlu penjelasan khusus) Examples: 5200 mm (? significant number) 5200 mm (3 significant number) or 5,20 x 103 mm (3 significant number) 4. All zeros used to determine the position of the decimal point are not significant number (nol disebelah kiri bilangan kurang dari 1, bukan angka penting) Examples: mm (2 significant number) gr (3 significant number)

13 5. All zeros number at the right hand side of decimal figures are significant number. (Semua angka nol di kanan bilangan desimal adalah angka penting) Example: cm (5 significant number) cm (3 significant number)

14 The mathematical operation of significant numbers
Addition and subtraction Example: = ≈ 530 – 287 = 243 ≈ 240 Multiplication and division Example: 796 x 320 = ≈ 0.428 : 0.7 = ≈ 0.6

15 Power and roots Example: = ≈ 35.3 3.28 = ≈ √196 = 14.0

16 PENGUKURAN TUNGGAL X = x0 ± Δx Δx = ½ . nst

17 PENGUKURAN BERULANG Xi (cm) Xi2(cm2) PENGUKURAN KE- 1 2,001 4,004001 2
2,000 4,000000 3 Sum (∑) 6,002 12,008002

18 Menentukan volume volume = rusuk1 x rusuk2 x rusuk3 volume = 2,001 x 2,000 x 2,001 volume = 8, cm3 volume = 8,008 cm3 (aturan pembulatan angka penting untuk perkalian)

19 Menentukan massa jenis

20 Contoh soal: 2,02 8, 10, jadi 10,4 2,02 x 8,4 = 16,968 = 17

21 Materi UH1 BAB 1 BAB 2: nst dan alat ukur (jangka sorong, mikrometer, neraca, stopwatch) Pengukuran tunggal dan ketidakpastian Pengukuran berulang dan simpangan baku Dimensi besaran turunan Notasi ilmiah Aturan angka penting Operasi hitung angka penting Awalan satuan (Tera, Giga, kilo, mili, mikro, nano dst) Konversi satuan ( kg/m3 jadi g/cm3 atau km/jam jadi m/s)