NCERT Solutions For Class 8 Science Chapter 12: Friction
NCERT books are structured in a way that each chapter is followed by a practice set. Students need to go through the chapter thoroughly to be able to answer the questions in the exercise. All solutions provided in this article are solved by a team of academic experts at Embibe. We have included detailed explanations with examples for all answers so that students can understand the concepts as well. NCERT Solutions Class 8 Science Chapter 12 is prepared in the most simplified manner so that students do not face any difficulty.
Students can also download the Class 8 Science Chapter 12 question answer as a PDF for free from this page. We have provided accurate and error-free solutions to all the exercises and in-text questions provided in the NCERT Books for Class 8 Science. Going through these solutions will help you complete your homework and assignments on time and secure high scores in the final exam.
NCERT Solutions For Chapter 12 Science Class 8: Friction
Before getting into the detailed NCERT Solutions Class 8 Science Chapter 12, let’s have an overview of topics and subtopics included in the Friction chapter. The different topics covered in this chapter are tabulated below. Click on any topic name to download the solutions as a PDF.
NCERT Class 8 Science Chapter 12 Question Answer: Solved Exercises And In-Text Questions
The solutions for NCERT Science Class 8 Chapter 12 provided here on Embibe are solved by experts in an easy-to-understand language for all CBSE Class 8 students. This will help them understand the concepts, thus, encouraging active learning and not just rote learning.
NCERT Solution For Class 8 Science Chapter 12: Chapter Summary
Let’s say you are cycling and suddenly something comes in front of you. What do you do? You quickly apply the brake and your bicycle stops. This happens due to something called friction. Friction can be seen in our day-to-day lives. Let’s look at another example. You are walking on a wet floor and it’s so slippery that you fell on the floor. This also happened due to friction.
Friction always acts opposite to the direction of the force you apply. For example, if you are pushing a box on the floor from point A to B then the friction existing between the surface of the floor and the surface of the box will be acting from B to A. This friction will always try to stop the box but it can only stop if the force applied is lesser than the force of friction.
Now, when we were saying that the floor is slippery, that means the friction at the surface is so less that even a small amount of force applied by you can easily overcome the frictional force. Thus, you will continue to move in the direction where you applied force and you will eventually slip. Now, let’s take the example of applying brakes when the cycle is moving. What is happening here is that you were already in motion and this motion was due to the force created in the process of pedalling. The application of brakes creates friction which eventually, exceeds the applied force and your bicycle comes to a stop.
FAQs Related To Class 8th Chapter 12 Science Solutions
Here we have provided some of the frequently asked questions related to solutions for Chapter 12 Class 8 Science:
Q1: Alida runs her toy car on the 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
A: The correct answer is (a) wet marble floor, dry marble floor, newspaper and towel.
Q2: Fill in the blanks. (a) Friction opposes the _____________ between the surfaces in contact with each other. (b) Friction depends on the _____________ of surfaces. (c) Friction produces __________. (d) Sprinkling of powder on the carrom board ________ friction. (e) Sliding friction is ___________ than the static friction.
A: (a) Friction opposes the motion between the surfaces in contact with each other. (b) Friction depends on the nature of surfaces. (c) Friction produces heat. (d) Sprinkling of powder on the carrom board reduces friction. (e) Sliding friction is lesser than the static friction.
Q3: Four children were asked to arrange forces due to rolling, static and sliding frictions in 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
A: The correct answer is (c) static, sliding, rolling
Q4: Explain why sliding friction is less than static friction.
A: When irregularities present in the surfaces of two objects in contact get interlocked with each other, friction comes into play. The interlocking is more in static friction compared to sliding friction because of the more surface in contact. Hence, the value of sliding friction is less than static friction.
Q5: Why do sportsmen use shoes with spikes?
A: Sportsmen use shoes with spikes because of the better grip given by spikes while running. This is because the force of friction between the shoes and the ground increases with the help of spikes.
Q6: Explain why objects moving in fluids must have special shapes.
A: When a body moves through a fluid, it experiences an opposing force which tries to oppose its motion through the fluid. This opposing force is known as the drag force. This frictional force depends on the shape of the body. By giving the objects a special shape, the force of friction acting on it can be minimized. Hence, it becomes easier for a body to move through the fluid.
So, now you have all the detailed solutions for Science Class 8 Chapter 12. Make the best use of these solutions and master this chapter. It will help you in future grades as well.
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