Physics 1 Extended Notes

HIGHER SECONDARY CERTIFICATE 2028 Science Group • English Version • Dhaka Education Board Physics First Paper Subject Code 174 Complete Chapter Notes Full syllabus • Labelled diagrams • Board style questions Prepared by Md Ahbab Hamid Khan ahbab.dev September 6, 2026

HSC 2028 • Physics First Paper • Code 174 1 Contents 1 Physical World and Measurement 5 Chapter 1 opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Syllabus map of this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Physics, law, theory and principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3 Physical quantity, unit and the SI system . . . . . . . . . . . . . . . . . . . . . . . . 6 1.4 Dimension and dimensional analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.5 Measuring instruments and least count . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.6 Error in measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.7 Significant figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.8 Straight line graph, the safest way to get a constant . . . . . . . . . . . . . . . . . . 11 1.9 Measuring current and potential difference . . . . . . . . . . . . . . . . . . . . . . . . 11 1.10 Worked board questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.11 Common mistakes . . . . . . .

HSC 2028 • Physics First Paper • Code 174 2 3.10 Board tips for this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.11 Cheat sheet for Chapter 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4 Newtonian Mechanics 43 Chapter 4 opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4.1 Syllabus map of this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4.2 The three laws of Newton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4.3 Momentum and the second law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 4.4 Impulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 4.5 Conservation of linear momentum . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.6 Collision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.7 Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.8 Body on an inclined plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 4.9 Circular motion . . . . . . . . .