Class 8 Assam Science | Chapter 7 Friction | NCERT | SCERT ASSAM
Chapter 7 (Friction) 1. Fill in the blanks — Answers (a) motion (b) nature of surfaces (c) heat (d) reduces (e) less 2. Arrange friction forces in decreasing order Answer : (c) static, sliding, rolling 3. Increasing order of friction on different surfaces Answer : (a) wet marble < dry marble < newspaper < towel 4. Direction of friction on a sliding book Answer : When the book slides down, friction acts upwards, opposite to its motion. 5. Why is it difficult to walk on a soapy floor? Answer : Soap reduces the friction between our feet and the floor. With less friction, we cannot get a proper grip, so walking becomes difficult. 6. Why do sportsmen wear shoes with spikes? Answer : Spikes increase friction with the ground, giving better grip for running. 7. Who needs to apply more force—Iqbal or Seema? Answer : Seema needs to apply more force because a heavier box presses the surfaces together more, increasing friction. 8. Why is sliding friction less than static friction? Answer ...