Class 8 Science Chapter 7 Friction Solutions | ASSEB Assam | English Medium

Class 8 Science Chapter 7 – Friction – All Textual Solutions | ASSEB Assam (English Medium)

Class 8 Science Chapter 7 – Friction Complete Textual Questions and Answers (ASSEB / SEBA Assam – English Medium)

Chapter 7 of the Class 8 Science curriculum, ‘Friction’, is a highly practical physics chapter that builds directly upon the concepts of force and motion. These complete textual question-answer solutions (Class 8 Science Chapter 7 Textual Solutions) have been meticulously prepared based on the latest guidelines of the new ASSEB (Assam State School Education Board) syllabus and the National Education Policy (NEP). This comprehensive compilation includes textbook-based Very Short Answers (VSA), Short Questions, Long Answers, detailed explanations, and key scientific definitions. Ospin Academy provides these solutions in a simple, accurate, and completely exam-oriented format.

The chapter ‘Friction’ provides an in-depth understanding of the force that opposes the relative motion between two surfaces in contact. It explores the factors affecting friction, such as the nature of the surfaces (smoothness or roughness) and how hard they press together. Students will learn about static, sliding, and rolling friction, why friction is considered a “necessary evil,” methods to increase or decrease friction using lubricants or ball bearings, and the concept of fluid friction (drag) exerted by liquids and gases. It is essential for students to thoroughly grasp these core concepts. Our textual solutions not only cover all the standard textbook exercises but also include important additional exam-oriented questions to ensure robust preparation.

What you will learn and get from these textual solutions:

• Clear explanations of the cause of friction (interlocking of irregularities on surfaces) and the different types of frictional forces.
• Accurate, point-wise answers for 1-mark objective questions (VSA) and 2-3 mark short textual questions.
• Standard and easy-to-understand explanations for descriptive and give-reason type questions, such as why soles of shoes are grooved or why sports shoes have spikes.
• Complete coverage of end-of-chapter exercises, fill-in-the-blanks, matching questions, and ways to minimize fluid friction using streamlined shapes.
• Extra important questions aligned with the new syllabus structure alongside standard MCQ solutions.

Exclusive features of Ospin Academy’s solutions:

• Fully textbook-based answers formulated strictly according to the latest ASSEB new syllabus guidelines.
• 100% accurate, high-quality notes written in simple English language for effortless memorization and understanding.
• Concise summaries and targeted answers specifically designed for quick revision before examinations.
• A curated selection of highly probable extra questions to give students a competitive edge.

Committed to the academic excellence of students, Ospin Academy offers these high-quality textual solutions. Start your preparation today to master the concepts of Science and achieve top scores in your upcoming examinations.

Class 8 Science

Chapter – 7                       Ospin Academy

Friction

TEXTBOOK EXERCISES

Q. 1. Fill in the blanks:

(a) Friction opposes the _________ between the surfaces in contact with each other.

Ans. relative motion.

(b) Friction depends on the _________ of surfaces.

Ans. nature.

(c) Friction produces __________.

Ans. heat.

(d) Sprinkling of powder on the carrom board __________ friction.

Ans. reduces.

(e) Sliding friction is _________ than the static friction.

Ans. less.

Q. 2. Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement:

(a) rolling, static, sliding.

(b) rolling, sliding, static.

(c) static, sliding, rolling.

(d) sliding, static, rolling.

Ans. (c) static, sliding, rolling.

Q. 3. Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:

(a) wet marble floor, dry marble floor, newspaper and towel.

(b) newspaper, towel, dry marble floor, wet marble floor.

(c) towel, newspaper, dry marble floor, wet marble floor.

(d) wet marble floor, dry marble floor, towel, newspaper.

Ans. (a) wet marble floor, dry marble floor, newspaper and towel and little.

Q. 4. Suppose your writing desk is tilted a little. A book kept on it starts sliding. Show the direction of frictional force acting on it.

Ans. The book moves downwards. The frictional force is acting opposite to the movement of book. So it acts upwards.

Q. 5. You spill a bucket of soapy water on a marble floor accidently. Would it make easier or more difficult for you to walk on the floor? Why?

Ans. It is difficult to walk on a soapy floor because layer of soap makes floor smooth. The coating of soap reduces the friction and the foot cannot make a proper grip on the floor and it starts getting to slip on the floor.

Q. 6. Explain why sportsmen use shoes with spikes.

Ans. Sportsmen use shoes with spikes to increase the friction so, that their shoes do not slip while they run or play.

Q. 7. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?

Ans. The heavy object will be pressed hard against the opposite surface and produces more friction. So Seema will have to apply a larger force due to excess friction.

Q. 8. Explain why sliding friction less than static friction.

Ans. Sliding friction is always less than static friction because two sliding objects find less time to get interlocked against each others, irregularities of surfaces so they get less friction.

Q. 9. Give examples to show that friction is both a friend and a foe.

Ans. Examples to show that friction is a friend.

(i) It allows us to walk comfortably on ground.

(ii) It allows us to grip and catch different objects.

(iii) Things don’t move from their places because of friction.

(iv) Speeds of moving objects can be minimized or stopped by friction only.

(v) It helps us to write on paper or black board.

Examples to show that friction is a foe:

(i) Friction causes wear and tear in objects.

(ii) Regular maintenance of objects moving against each other (machine and tools) wastes a lot of useful money.

(iii) It makes the movement of heavy objects very difficult.

(iv) It causes damage the parts of machines.

(v) It does not allow the free movement of objects.

Q. 10. Explain why objects moving in fluids must have special shapes.

Ans. The object moving in fluids must have a special shape. This type of shape is called streamlined shape. The streamlined shape helps to overcome the friction between objects and fluids. The objects have pointed fronts with little broader middle position which gets tempered at the back.