Book: Lakhmir Singh & Manjit Kaur - Science
Chapter: 12. Friction
Subject: Physics - Class 8th
Q. No. 68 of Long Answer Type Questions
Listen NCERT Audio Books - Kitabein Ab Bolengi
68
How can a very heavy machine be moved conveniently from one place to another in a factory? (No crane is available for this purpose).
A very heavy machine can be moved from one place to another with the help of wheels. Because then rolling friction comes into action and its value is the least among static and sliding friction.
The following diagram shows, how a heavy cylinder can be rolled easily.
68