PART–4 (vi) : IIT / JEE Previous Year Questions – Final Set
This final set completes the 30+ PYQ coverage for Laws of Motion. Questions focus on mixed concepts, hidden constraints, and examiner psychology.
PYQ–26 (IIT–JEE)
Question:
A block of mass m is pulled by a horizontal force F on a rough surface. If acceleration is zero, find the frictional force acting on the block.
Method Selection:
Zero acceleration implies force balance.
Solution:
Net force = 0 ⇒ friction = F (opposite direction).
Examiner’s Intention:
To test understanding that friction adjusts to balance applied force.
PYQ–27 (IIT–JEE)
Question:
Two forces of equal magnitude act on a body at right angles. Find the magnitude of acceleration of the body.
Method Selection:
Use vector addition of forces.
Solution:
Resultant force = √(F² + F²) = F√2
Acceleration, a = F√2 / m
PYQ–28 (IIT–JEE)
Question:
A block slides down a smooth incline. Which quantity remains constant?
Method Selection:
Analyze forces and acceleration.
Solution:
Acceleration is constant (g sinθ), hence force component constant.
Common Trap:
Students answer “velocity” instead of “acceleration”.
PYQ–29 (IIT–JEE)
Question:
A man pushes a wall but the wall does not move. Is Newton’s Third Law violated?
Method Selection:
Conceptual analysis of action–reaction.
Solution:
Action and reaction act on different bodies. No violation of Newton’s Third Law.
PYQ–30 (IIT–JEE)
Question:
A body has zero velocity and non-zero acceleration. Give an example.
Method Selection:
Conceptual distinction between velocity and acceleration.
Solution:
At the highest point of vertical motion, velocity = 0 but acceleration = g downward.
Final Examiner Pattern (Must Read)
- Velocity and acceleration are tested separately.
- Zero acceleration ≠ zero force always (check balance).
- Friction problems test direction more than formula.
- System approach saves time in multi-body problems.
- Conceptual PYQs often decide ranks.
PART–4 Completed.
PYQs covered: 30+
Laws of Motion is now exam-ready for Intermediate and IIT–JEE.
📚 Physics Thinking Library – How IIT Toppers Think
Welcome to the Physics Thinking Library by Mind Grow Magazine. This library is specially designed for IIT–JEE & Intermediate students to understand how toppers think, decide, and solve Physics problems.
🎯 What You Will Learn From This Library
- How IIT toppers approach Physics questions
- Decision-making during problem solving
- Common traps & how to avoid them
- Exam-hall mindset and logic flow
- Step-by-step thinking framework
📘 Complete Series: How IIT Toppers Think (Part 1–25)
Click on any part below to start learning. It is recommended to read in order.
- Part 1 – Introduction to Topper Thinking
- Part 2 – Understanding the Problem Statement
- Part 3 – Visualization & Physical Sense
- Part 4 – Role of Acceleration & Forces
- Part 5 – Free Body Diagram Thinking
- Part 6 – Method Selection Strategy
- Part 7 – Avoiding Formula Traps
- Part 8 – System Approach Mindset
- Part 9 – Friction & Constraint Thinking
- Part 10 – Time vs Accuracy Balance
- Part 11 – Common Thinking Mistakes
- Part 12 – Decision Flow in Tough Problems
- Part 13 – Eliminating Wrong Options
- Part 14 – Handling Multi-Concept Questions
- Part 15 – Pressure Handling in Exam Hall
- Part 16 – Speed Building Without Guessing
- Part 17 – Extreme Case Thinking
- Part 18 – Logical Shortcuts vs Blind Tricks
- Part 19 – Advanced Reasoning Techniques
- Part 20 – Rank-Deciding Thought Patterns
- Part 21 – Physics Intuition Development
- Part 22 – Eliminating Panic in Tough Questions
- Part 23 – Last-Minute Thinking Strategy
- Part 24 – Mistake-Proof Problem Solving
- Part 25 – Final Topper Framework
🧠 How to Use This Library Effectively
- Read 1–2 parts daily
- Apply thinking to real Physics problems
- Revisit library before exams
- Use as a mindset guide, not memorization
This library is a long-term asset for serious Physics learners.
© Mind Grow Magazine
No comments:
Post a Comment