Odia Medium Class 8 Science Chapter 9 Question Answer

BSE Odisha Class 8 Science Chapter 9: Friction (ଘର୍ଷଣ)

Mastering the concepts of Friction is essential for understanding why objects stop moving and how we are able to walk on the ground. At Odisha Board Solutions, we provide simplified, stepwise answers for Class 8 Science Chapter 9, specifically updated for the 2026-27 session.

1. What is Friction? (ଘର୍ଷଣ କ’ଣ?)

Friction is the force that opposes the relative motion between two surfaces in contact. It always acts in a direction opposite to the applied force.

Factors Affecting Friction:

  • Nature of the Surface: Rough surfaces offer more friction than smooth surfaces.

  • Force of Pressing: The harder the two surfaces are pressed together, the greater the friction.

2. Types of Friction (ଘର୍ଷଣର ବିଭିନ୍ନ ପ୍ରକାର)

In the BSE Odisha exams, understanding the hierarchy of friction is a very important concept:

  1. Static Friction (ସ୍ଥିତ ଘର୍ଷଣ): The force required to start an object moving from rest. This is the strongest type of friction.

  2. Sliding Friction (ସର୍ପୀ ଘର୍ଷଣ): The force that acts when an object is sliding over another. It is slightly less than static friction.

  3. Rolling Friction (ଲୁଣ୍ଠନ ଘର୍ଷଣ): The force that acts when an object rolls over a surface. This is the weakest type of friction.

3. Friction: A Necessary Evil (ଘର୍ଷଣ: ଏକ ଅପରିହାର୍ଯ୍ୟ କୁପ୍ରଭାବ)

Friction is called a “Necessary Evil” because it is both helpful and harmful.

  • Why it is Necessary: It allows us to walk without slipping, write with a pen, and stop vehicles using brakes.

  • Why it is Evil: It causes wear and tear in machine parts, produces unwanted heat, and wastes energy.

4. Increasing and Reducing Friction

Depending on our needs, we can manipulate friction:

  • To Increase: Treaded tires of trucks/tractors and spikes on athlete’s shoes.

  • To Reduce: Using lubricants (oil, grease), using ball bearings, or sprinkling fine powder on a carrom board.

5. Download Class 8 Science Chapter 9 PDF (Odia Medium)

We offer a FREE PDF Download of the Class 8 Science Chapter 9 Questions and Answers. This PDF is optimized for Odia medium students to ensure the script and diagrams are perfectly clear on any device, helping you maintain a high-quality standards.

Revision Tip: Remember that Fluid Friction (also known as Drag) depends on the shape of the object. This is why airplanes and fish have “streamlined” bodies to reduce resistance.