Laws of Motion — Class 11 Physics NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 11 Physics chapter "Laws of Motion" — 7 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 11 Physics chapter "Laws of Motion" — 7 important questions with detailed answers for CBSE board exam prep…
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Key Questions Covered:
- State Newton's three laws of motion and explain the second law with a mathema…
- A block of mass 5 kg is placed on a horizontal surface. If a horizontal force…
- Two blocks of masses 4 kg and 6 kg are connected by a light string and are pu…
- + 4 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| State Newton's three laws of motion and explain the secon… | ✓ Solved |
| A block of mass 5 kg is placed on a horizontal surface. I… | ✓ Solved |
| Two blocks of masses 4 kg and 6 kg are connected by a lig… | ✓ Solved |
Showing 3 of 7 questions
Q1: State Newton's three laws of motion and explain the second law with a mathematical equation.
Newton's Three Laws of Motion:
First Law (Law of Inertia):
Every object continues to be in a state of rest or uniform motion in a straight line unless compelled by an external force to change that state.
Key points:
- An object at rest tends to remain at rest
- An object in motion tends to remain ...
Q2: A block of mass 5 kg is placed on a horizontal surface. If a horizontal force of 20 N is applied and the block accelerates at 3 m/s², find the friction force acting on the block.
Given:
Mass m = 5 kg
Applied force F = 20 N (horizontal)
Acceleration a = 3 m/s²
Find: Friction force f
Step 1: Apply Newton's second law
The net force on the block is:
F_net = ma = 5 × 3 = 15 N
Step 2: Identify forces in horizontal direction
In the horizontal direction:
- Applied force F = 20 ...
Q3: Two blocks of masses 4 kg and 6 kg are connected by a light string and are pulled horizontally by a force of 50 N. Find (a) acceleration of the system (b) tension in the string connecting the two blocks (take g = 10 m/s²).
Given:
Mass m₁ = 4 kg (leading block)
Mass m₂ = 6 kg (trailing block)
Applied force F = 50 N
Assuming frictionless surface and g = 10 m/s²
Part (a): Acceleration of the system
Step 1: Consider the entire system as one body
Total mass M = m₁ + m₂ = 4 + 6 = 10 kg
Step 2: Apply Newton's second law ...
Showing 3 of 7 questions. Visit the full page for complete solutions.