Class 9 Exam > Class 9 Notes > Science Class 9 > Short Notes - Force and Laws of Motion
Force and Laws of Motion Class 9 Notes Science Chapter 8
- Force: It is a push or pull on an object that produces acceleration in the body on which it acts. S.I. unit of force is Newton.
- A force can do three things on a body.
(a)It can change the speed of a body.
(b)It can change the direction of motion of a body.
(c)It can change the shape and size of a body. - Balanced forces: Forces are said to be balanced forces if they nullify one another and their resultant force is zero.
- Unbalanced forces: When two opposite forces acting on a body, move a body in the direction of the greater force or forces which brings motion in a body are called as unbalanced forces.
- First law of motion: An object remains in a state of rest or of uniform motion in a straight line unless acted upon by an external unbalanced force.
Question for Short Notes - Force and Laws of MotionTry yourself: Which of the following is NOT a possible effect of a force acting on an object?View Solution
- Inertia: The natural tendency of an object to resist a change in its state of rest or of uniform motion is called inertia.
The mass of an object is a measure of its inertia.
Its S.I. unit is kg.
A body with greater mass has greater inertia. - Frictional force: The force that always opposes the motion of objects is called force of friction.
- Second law of motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.
Mathematically, - Momentum: The momentum of an object is the product of its mass and velocity and has the same direction as that of the velocity. Its S.I. unit is kg m/s.
(p = mv )
1 Newton: A force of one Newton produces an acceleration of 1 m/s2 on an object of mass 1kg.
1N = 1 kg m/s2
(F = ma) - Third law of motion: To every action, there is an equal and opposite reaction and they act on two different bodies.
The document Force and Laws of Motion Class 9 Notes Science Chapter 8 is a part of the Class 9 Course Science Class 9.
All you need of Class 9 at this link: Class 9
|
87 videos|369 docs|67 tests
|
FAQs on Force and Laws of Motion Class 9 Notes Science Chapter 8
| 1. What is Newton's First Law of Motion? |  |
Ans. Newton's First Law of Motion states that an object at rest will remain at rest, and an object in motion will continue to move in a straight line at constant speed unless acted upon by an unbalanced external force. This law is often referred to as the law of inertia.
| 2. How do forces act in pairs according to Newton's Third Law of Motion? | |
Ans. According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts a force of equal magnitude but in the opposite direction on the first object.
| 3. What is the formula for calculating force, and what does each term represent? | |
Ans. The formula for calculating force is F = m × a, where F represents force measured in Newtons (N), m represents mass measured in kilograms (kg), and a represents acceleration measured in meters per second squared (m/s²). This formula shows that force is the product of mass and acceleration.
| 4. What is the significance of the concept of inertia in everyday life? | |
Ans. The concept of inertia explains why objects tend to resist changes in their state of motion. For example, when a car suddenly stops, passengers lurch forward due to inertia. This principle is crucial for understanding safety measures in vehicles, such as seat belts, which help to counteract the effects of inertia during sudden stops.
| 5. How do balanced and unbalanced forces affect motion? | |
Ans. Balanced forces do not change the motion of an object; they result in a net force of zero, meaning the object remains at rest or moves at a constant speed. Unbalanced forces, on the other hand, result in a net force that causes an object to accelerate, changing its speed or direction of motion.
Related Exams
About this Document
|
5.4K Views |
|
4.71/5 Rating |
|
Nov 22, 2024 Last updated |
Document Description: Short Notes - Force and Laws of Motion for Class 9 2024 is part of Science Class 9 preparation.
The notes and questions for Short Notes - Force and Laws of Motion have been prepared according to the Class 9 exam syllabus. Information about Short Notes - Force and Laws of Motion covers topics
like and Short Notes - Force and Laws of Motion Example, for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Short Notes - Force and Laws of Motion.
Introduction of Short Notes - Force and Laws of Motion in English is available as part of our Science Class 9
for Class 9 & Short Notes - Force and Laws of Motion in Hindi for Science Class 9 course.
Download more important topics related with notes, lectures and mock test series for Class 9
Exam by signing up for free. Class 9: Force and Laws of Motion Class 9 Notes Science Chapter 8
Description
Full syllabus notes, lecture & questions for Force and Laws of Motion Class 9 Notes Science Chapter 8 - Class 9 | Plus excerises question with solution to help you revise complete syllabus for Science Class 9 | Best notes, free PDF download
Information about Short Notes - Force and Laws of Motion
In this doc you can find the meaning of Short Notes - Force and Laws of Motion defined & explained in the simplest way possible. Besides explaining types of
Short Notes - Force and Laws of Motion theory, EduRev gives you an ample number of questions to practice Short Notes - Force and Laws of Motion tests, examples and also practice Class 9
tests
|
Explore Courses for Class 9 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Objective type Questions
,past year papers
,Force and Laws of Motion Class 9 Notes Science Chapter 8
,video lectures
,Previous Year Questions with Solutions
,Sample Paper
,shortcuts and tricks
,Exam
,Force and Laws of Motion Class 9 Notes Science Chapter 8
,Free
,Important questions
,Force and Laws of Motion Class 9 Notes Science Chapter 8
,Viva Questions
,Extra Questions
,practice quizzes
,study material
,MCQs
,Summary
,ppt
,Semester Notes
,mock tests for examination
;
Additional Information about Short Notes - Force and Laws of Motion for Class 9 Preparation
Short Notes - Force and Laws of Motion Free PDF Download
The Short Notes - Force and Laws of Motion is an invaluable resource that delves deep into the core of the Class 9 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Short Notes - Force and Laws of Motion now and kickstart your journey towards success in the Class 9 exam.
Importance of Short Notes - Force and Laws of Motion
The importance of Short Notes - Force and Laws of Motion cannot be overstated, especially for Class 9 aspirants.
This document holds the key to success in the Class 9 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Short Notes - Force and Laws of Motion
Short Notes - Force and Laws of Motion Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Short Notes - Force and Laws of Motion.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Short Notes - Force and Laws of Motion Notes on EduRev are your ultimate resource for success.
Short Notes - Force and Laws of Motion Class 9 Questions
The "Short Notes - Force and Laws of Motion Class 9 Questions" guide is a valuable resource for all aspiring students preparing for the
Class 9 exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Short Notes - Force and Laws of Motion on the App
Students of Class 9 can study Short Notes - Force and Laws of Motion alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Short Notes - Force and Laws of Motion,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Short Notes - Force and Laws of Motion is prepared as per the latest Class 9 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup