Important Laws of Motion Formulas and Solved Examples for 2025
Laws of Motion is a fundamental chapter in JEE Physics, testing your grasp on Newton’s Laws, friction, and dynamics of motion. Excelling in this topic is vital for high-scoring in JEE Main, as it forms the backbone for understanding mechanics and solving complex problems. Take this targeted mock test to reinforce essential concepts and enhance your speed and accuracy for the 2025 exam!
Mock Test Instructions for the Laws of Motion Mock Test 1:
- 20 questions from Laws of Motion
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Help You Master Laws of Motion?
- Identify and overcome misconceptions in Newton’s Laws and force application.
- Enhance accuracy and speed in solving friction and dynamics questions.
- Track progress and focus on weaker subtopics like block-pulley systems.
- Simulate real-time conditions to refine your quick problem-solving skills.
- Use mock test feedback to strengthen grasp on free-body diagrams and force analysis.
Crack Laws of Motion with Expert-Designed JEE Mock Tests
- Practice on latest exam pattern questions curated by JEE Physics experts.
- Master vector resolution, constraint equations, and friction types through active testing.
- Experience negative marking and time pressure as in the actual JEE Main exam.
- Improve performance on PYQ-style MCQs from Laws of Motion & connected topics.
- Revise essential formulae and concepts via topic-focused test practice for maximum retention.
Subject-Wise Excellence: JEE Main Mock Test Links
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| 1 | Online FREE Mock Test for JEE Main Chemistry |
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Important Study Materials Links for JEE Exams
FAQs on Laws of Motion Mock Test 2025-26: Practice Questions & Answers
1. What are Newton's laws of motion?
Newton's Laws of Motion are three fundamental laws that describe the relationship between the motion of objects and the forces acting upon them. They include:
• First Law (Law of Inertia): An object will remain at rest or move in a straight line at constant speed unless acted upon by an external force.
• Second Law: The rate of change of momentum of an object is directly proportional to the net force applied, and it takes place in the direction of the force (mathematically, F = ma).
• Third Law: For every action, there is an equal and opposite reaction.
2. Define inertia. How does it relate to the first law of motion?
Inertia is the property of a body to resist any change in its state of rest or motion. According to Newton's First Law of Motion, unless acted upon by an external force, an object will remain in its current state, which directly explains the concept of inertia.
3. What is momentum? State its SI unit.
Momentum is the product of mass and velocity of an object (p = mv). It represents the quantity of motion possessed by the body. The SI unit of momentum is kilogram meter per second (kg·m/s).
4. State and explain Newton's Second Law of Motion with one example.
Newton's Second Law of Motion states that the rate of change of momentum of a body is directly proportional to the applied net force, and this change takes place in the direction of the force. Example: When you kick a football, the harder you kick (greater force), the faster it accelerates (higher change in velocity).
5. How does Newton's Third Law of Motion apply to rocket propulsion?
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. In rockets, the expulsion of gases downwards through the rocket nozzle (action) produces an upward thrust (reaction) that propels the rocket into space.
6. What is the difference between mass and weight?
Mass is the amount of matter contained in a body and is a scalar quantity, measured in kilograms (kg). Weight is the force with which a body is attracted towards the earth due to gravity, calculated as W = mg, and is a vector quantity measured in newtons (N).
7. Explain the concept of force. Mention its SI unit.
Force is a physical quantity that causes an object to accelerate, change its velocity, or deform. It is a vector quantity and its SI unit is the newton (N).
8. What is friction? How does it affect motion?
Friction is the resistive force that opposes the relative motion or attempt of motion between two surfaces in contact. It slows down moving objects and can also prevent them from starting to move.
9. Why do passengers tend to fall forward when a moving bus stops suddenly?
When a moving bus stops suddenly, the lower part of the passenger's body stops with the bus, but the upper part tends to keep moving forward due to inertia. This causes the passengers to fall forward.
10. State the law of conservation of momentum with a suitable example.
The Law of Conservation of Momentum states that if no external force acts on a system of interacting objects, the total momentum of the system remains constant. Example: When two billiard balls collide, the total momentum before and after the collision remains the same if no external force acts.
11. Why is it dangerous to jump out of a moving bus?
Jumping out of a moving bus is dangerous because your body possesses the forward momentum of the moving bus. Upon landing, your feet come to rest suddenly, but the rest of your body, due to inertia, continues to move, increasing the risk of falling and injury.
12. Which types of questions can be expected from 'Laws of Motion' in JEE?
JEE exams commonly include questions from the following areas of Laws of Motion:
• Numerical problems on force, mass, and acceleration
• Conceptual questions on all three Newton's laws
• Applications based on friction, pulley systems, and inclined planes
• Assertion-Reasoning or MCQ type questions testing conceptual understanding and reasoning ability.
