PHYSICS – LESSON 2
MOTION IN A STRAIGHT LINE
STAGE–5 : NECESSARY DIAGRAMS (BOARD + IIT)
Why Diagrams Are Important
In Physics exams, diagrams carry marks. A correct diagram can:
- Fetch full marks even if explanation is short
- Improve clarity of answers
- Reduce examiner confusion
- Help students remember concepts visually
Board Rule:
Neat diagram + proper labels = guaranteed marks.
📐 Diagram–1 : Distance and Displacement
Where it is used:
- 2M / 4M theory questions
- Difference between distance & displacement
What to draw:
- A straight line path
- Initial point A
- Final point B
- Curved/long path = Distance
- Straight line AB = Displacement
Label clearly: A, B, Distance, Displacement
📈 Diagram–2 : Position–Time (x–t) Graph
Where it is used:
- Graph questions (Intermediate)
- Conceptual IIT questions
What to draw:
- Time on X-axis
- Position on Y-axis
- Straight line → uniform motion
- Curve → non-uniform motion
Key Point:
Slope of x–t graph = Velocity
📉 Diagram–3 : Velocity–Time (v–t) Graph
Where it is used:
- Numericals
- IIT graph-based problems
What to draw:
- Time on X-axis
- Velocity on Y-axis
- Straight line with slope
Important Relations:
- Slope of v–t graph = Acceleration
- Area under v–t graph = Displacement
📊 Diagram–4 : Acceleration–Time (a–t) Graph
Where it is used:
- IIT Advanced conceptual questions
- Relation between velocity & acceleration
What to draw:
- Time on X-axis
- Acceleration on Y-axis
- Horizontal line → constant acceleration
Key Relation:
Area under a–t graph = Change in velocity
➡️ Diagram–5 : Uniform Motion on Straight Line
Where it is used:
- Definition of uniform motion
- Short answer questions
What to draw:
- Straight road
- Object at equal distances in equal time intervals
- Equal spacing between positions
✍️ How to Practice Diagrams for Exams
- Practice drawing diagrams daily
- Use pencil and ruler
- Label all axes and points clearly
- Do not overcrowd the diagram
- Keep diagrams simple and neat
🎯 Final Exam Tip
If a question mentions explain / define / describe, ALWAYS draw a diagram — even if it is not explicitly asked.
✅ STAGE–5 COMPLETE
Lesson–2 is now 100% PERFECT (5 STAGES)
Intermediate Physics Complete Notes – IIT JEE & Board Exams
This page contains complete Intermediate Physics notes along with IIT JEE materials, previous year questions, solved problems, diagrams, and exam strategies.
📘 Lesson 1: Units and Measurements
📘 Lesson 2: Motion in a Straight Line
📘 Lesson 3: Motion in a Plane
- Part 1
- Part 2
- Part 3
- Part 4
- Part 5
- Part 6
- Part 7
- Part 8
- Part 9
- Part 10
- Part 11
- Part 12
- Part 13
- Part 14
- Part 15
- Part 16
- Part 17
This page is updated regularly with new lessons.
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