SEBA Class 8 Science Important Chapter 7 Friction

SEBA Class 8 Science Important Chapter 7 Friction Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 7 Friction

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Friction

Chapter: 7

PART – I

IMPORTANT QUESTION ANSWER

A. Very Short Type Question & Answer:

1. What is friction?

Ans: Friction is the force that opposes the motion of an object moving over a surface.

2. How does friction affect the motion of objects?

Ans: Friction slows down the motion of objects and eventually brings them to rest.

3. What is the role of friction in daily life?

Ans: Friction helps us walk, write with a pen, and hold objects. It also helps in driving vehicles.

4. How do rough surfaces affect friction?

Ans: Rough surfaces increase friction because they have more irregularities that interlock with the surface of the object.

5. What happens when two forces act in opposite directions?

Ans: The net force is the difference between the two forces, and the object may move in the direction of the larger force.

6. What is the effect of friction on the movement of a bicycle?

Ans: Friction helps to stop the bicycle when brakes are applied and provides the necessary grip for movement.

7. How do lubricants reduce friction?

Ans: Lubricants form a thin layer between surfaces, preventing direct contact and reducing the interlocking of irregularities, thus reducing friction.

8. What is rolling friction?

Ans: Rolling friction is the resistance encountered when an object rolls over a surface. It is less than sliding friction.

9. What is fluid friction?

Ans: Fluid friction is the force exerted by a fluid (like air or water) on objects moving through it.

10. How does the shape of an object affect fluid friction?

Ans: Streamlined shapes reduce fluid friction by allowing objects to move more easily through the fluid.

B. Fill in the Blanks:

1. Friction is caused by the _________ on the surfaces in contact.

Ans: Irregularities.

2. The force of friction between two objects depends on the nature of the _________.

Ans: Surfaces.

3. The force required to keep an object moving at a constant speed is called ________ friction.

Ans: Sliding.

4. A substance that reduces friction is called a _________.

Ans: Lubricant.

5. The force that opposes motion when an object moves through a fluid is called ________ friction.

Ans: Fluid.

C. True or False:

1. Friction can never be eliminated completely.

Ans: True.

2. Friction helps in stopping a moving object.

Ans: True.

3. A smooth surface produces more friction than a rough surface.

Ans: False.

4. Rolling friction is smaller than sliding friction.

Ans: True.

5. Friction is not needed for walking.

Ans: False.