Daily Practice Problems
Class 9 Science
Force and Laws of Motion
daily practice problem

Question 1.

What is the first law of motion?

Question 2.

Define the property of an object ‘inertia’.

Question 3.

What do you understand by the term ‘momentum’?

Question 4.

What does second law of motion state?

Question 5.

Give mathematical formulation of second law of motion.

Question 6.

What do you understand by ‘conservation of momentum’?

Question 7.

Force of friction always _________ motion of objects.

(a) opposes

(b) follows

(c) both (a) and (b)

(d) none of the above

Question 8.

What is the third law motion?

Question 9.

How do you define ‘force of one Newton’?

Question 10.

A constant force acts on an object of mass 6 kg for a duration of 3 s. It increases the object’s velocity from 4 m-s–1 to 8 m-s-1. Find the magnitude of the applied force. Now, if the force was applied for a duration of 4 s, what would be the final velocity of the object?

Question 11.

Which would require a greater force- an object accelerating with 1 ms-2 having mass 5 kg and an object accelerating with 3 ms-2 having mass 10 kg?

Question 12.

A motorcar is moving with a velocity of 90 km/h and it takes 3 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1500 kg.

Question 13.

A force of 10 N gives a mass m1, an acceleration of 15 m-s–2 and a mass m2, an acceleration of 30 m-s-2. What acceleration would it give if both the masses were tied together?

Question 14.

A bullet of mass 30 g is horizontally fired with a velocity 200 m-s-1 from a pistol of mass 3 kg. What is the recoil velocity of the pistol?

Question 15.

A girl of mass 50 kg jumps with a horizontal velocity of 6 m-s-1 onto a stationary cart with frictionless wheels. The mass of the cart is 5 kg. What is her velocity as the cart starts moving? Assume that there is no external unbalanced force working in the horizontal direction.

Question 16.

A bullet of mass 40 g is horizontally fired with a velocity 500 m-s-1 from a pistol of mass 8 kg. What is the recoil velocity of the pistol?

Question 17.

Which would require a smaller force- an object accelerating with 3 ms-2 having mass 18 kg and an object accelerating with 2 ms-2 having mass 20kg?

Question 18.

A force of 20 N gives a mass m1, an acceleration of 12 m-s–2 and a mass m2, an acceleration of 40 m-s-2. What acceleration would it give if both the masses were tied together?

Question 19.

A bullet of mass 50 g is horizontally fired with a velocity 300 m-s-1 from a pistol of mass 5 kg. What is the recoil velocity of the pistol?

Question 20.

A boy of mass 35 kg jumps with a horizontal velocity of 5 m-s-1 onto a stationary cart with frictionless wheels. The mass of the cart is 6 kg. What is his velocity as the cart starts moving? Assume that there is no external unbalanced force working in the horizontal direction.

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Problem-solving on Class 9 Science Force and Laws of Motion NCERT Chapter 9 after learning a theoretical concept is crucial for several reasons:

  1. Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic Class 9 Science Force and Laws of Motion you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
  2. Understanding Deeper Concepts: When you encounter problems related to a theoretical concept that you learned in Class 9 Science Force and Laws of Motion NCERT Chapter 9, you are forced to delve deeper into its intricacies. This deeper understanding enhances your comprehension of the subject and strengthens your grasp of the underlying principles.
  3. Critical Thinking: Problem-solving encourages critical thinking and analytical skills. It requires you to analyze the problem, identify relevant information, and devise a logical solution. This process sharpens your mind and improves your ability to approach complex challenges effectively.
  4. Retention and Recall: Actively engaging in problem-solving reinforces your memory and improves long-term retention. Applying the concepts learned in Force and Laws of Motion Class 9 Science in practical scenarios helps you remember them better than passive reading or memorization.
  5. Identifying Knowledge Gaps: When you attempt to solve problems, you may encounter areas where your understanding is lacking. These knowledge gaps become evident during problem-solving, and you can then focus on filling those gaps through further study and practice. You can refer Force and Laws of Motion Class 9 Science Notes on LearnoHub.com
  6. Boosting Confidence: Successfully solving problems after learning a theoretical concept boosts your confidence in your abilities to handle Force and Laws of Motion. This confidence motivates you to tackle more challenging tasks and improves your overall performance in the subject.
  7. Preparation for Exams and Challenges: Many exams, especially in science, mathematics, and engineering, involve problem-solving tasks. Regular practice in problem-solving prepares you to face these exams with confidence and perform well. It is also advised to take tests on Force and Laws of Motion Class 9 Science Online Tests at LearnoHub.com.
  8. Enhancing Creativity: Problem-solving often requires thinking outside the box and exploring various approaches. This fosters creativity and innovation, enabling you to come up with novel solutions to different problems.
  9. Life Skills Development: Problem-solving is a valuable life skill that extends beyond academics. It equips you with the ability to tackle various challenges you may encounter in personal and professional life.
  10. Improving Decision Making: Problem-solving involves making decisions based on available information and logical reasoning. Practicing problem-solving enhances your decision-making skills, making you more effective in making informed choices.

In summary, problem-solving after learning a theoretical concept on CBSE Force and Laws of Motion Class 9 Science is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on Class 9 Science Force and Laws of Motion NCERT Chapter 9

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 9 Science Force and Laws of Motion NCERT Chapter 9 useful.

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