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9. Force and Laws of Motion Science class 9 in English Medium ncert book solutions Chapter Review
9. Force and Laws of Motion Chapter Review – Complete NCERT Book Solutions for Class 9 Science (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 9. Force and Laws of Motion Chapter Review to help you master concepts and score higher.
9. Force and Laws of Motion Science class 9 in English Medium ncert book solutions Chapter Review
NCERT Solutions for Class 9 Science play an important role in helping students understand the concepts of the chapter 9. Force and Laws of Motion clearly. This chapter includes the topic Chapter Review, which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 9 studying Science can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 9. Force and Laws of Motion is explained in a structured way, making it easier for students to connect the theory with the topic Chapter Review. By studying these updated NCERT Solutions for Class 9 Science, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
9. Force and Laws of Motion
Chapter Review
Chapter 9. Force And Law Of Motion
Q- What is force ?
A – It is a push or pull which change or has a tendency to change the position of body. It’s SI unit is kgm-2 .
Q- Write the Newton’s law of motion?
A –
- A body continues to maintain its position of rest or motion unless an antennae force acts upon it
- The rate of change of momentum of body is directly proportional to the force applied and takes placed in the direction of force.
- For every action there is equal and opposition reaction.
Q:- What is balance force ?
A:- If the resultant of the several force acting a body is zero than force are said to be balance force.
Q - What is unbalance force?
A- If the resultant of the several force acting a body is not zero than force are said to be balance force.
Q – What is momentum?
A – it is quantity of motion possessed by a body is equal to the product of the mass and velocity of the body. Its SI unit is kgms-1 Momentum = mass x velocity (p=mv)
Q – Define Newton?
A - It is the unit of force.
Q – What is inertia?
A – The tendency of undisturbed objects to stay at rest or to keep
moving with the same velocity is called inertia.
Q – How can we reduce the effect of friction force ?
A –
- Using a some their plane or surface.
- Using a lubricant.
- Polishing.
Q- Why is the Newton’s first low of motion also called “Low of inertia”?
A – According to Newton first low of motion an object by itself is not able to change its state of rest or of uniform motion. This property of n is called inertia. That is why the Newton first low of motion is called low of Inertia.
Q- Define mass and inertia?
A –Inertia is the natural tendency of an object to result of motion. The mass of an object is a measure of its inertia.
Q- What are the different types of inertia?
A – Three types are inertia:-
- Inertia of rest.
- Inertia of motion.
- Inertia of direction.
Q- What is the unit of mass and inertia?
A – K. g.
Q- Which scientist proved first that object move with constant speed when no force acts on them?
A – Galileo.
Q- Why does moving marble stops after travelling some distance?
A - A moving marble stops after travelling some distance because of the friction. Force acting opposite to the direction of motion.
Q- Who introduced the concept of momentum?
A – Newton.
Q- Which low of motion gives the mass are of force?
A – Second low of motion.
Q - What happen when an unbalanced force is applied on the object ?
A - when an unbalanced force is applied on the object:-
- Change its speed .
- Change its direction of motion.
Q – Why safety belts are worn during driving ?
A- A sudden application of breaks may cause injury to us by impact or collisions with the panels in front safety belt are worn to prevent from such accidents. Safety belts exert a force on our to make the forward motion slower.
Q – When does an object move?
A - An object moves when the object is under the continues application of an unbalanced force.
Q – Define inertia of rest and give some example?
A- the tendency of a body to remain its position of rest is called inertia of rest. Example;-
- Dust is removed from a hanging carpet by beating with a stick. As the carpet is beaten it suddenly moves forward while the dust particle tend to remain at rest due to inertia and so fall off.
- When we snake a tree, the fruits or dry to inertia of rest.
Q - Example how Newton’s first law of motion is a special case of second law?
A - According to Newton’s second law ;-
F= ma
F =
Ft= mv – mu
Or
That is when F=0, v=u for whatever time t is taken. This means that the object will continue moving with uniform velocity is throughout the time t. If u is zero then v will also be zero. That is the object will remain at rest.
Q – how many types of force in the third law of motion?
A-
- Action
- Reaction
Q – What types of force dose make us possible to walk?
A – Reaction
Q- Name the weakest and strongest force from in nature?
- Weakest = gravitation force.
- Strongest = Nuclear force
Q – What is the SI unit of weight?
A- Newton
See other sub-topics of this chapter:
1. Chapter Review 2. Text-book Questions 3. Additional -Questions 4. Additional -Questions 2 5. Additional -Questions 3