Question

Choose the correct increasing order of magnitude for different types of friction.

• A. Static, sliding, rolling
• B. Rolling, sliding, static
• C. Static, rolling, sliding
• D. Rolling, static, sliding

Answer 1

The correct option is B Rolling, sliding, static

Static friction is greater than sliding friction. This is because to move a stationary body, we need to overcome interlocking between irregularities present on the surfaces. However, once the body starts sliding, the contact points on its surface, do not get enough time to lock into the contact points on the other surface. Using wheels or rollers further decreases the opposition to motion. That's why the invention of wheel was revolutionary.