Q8. Explain why sliding friction is less than static friction.
Sliding friction is less than static friction as the frictional force between two surfaces depends on the interlocking between the irregularities on the surfaces. This interlocking in case of sliding decreases as the contact points does not get enough time to interlock properly thus reducing the frictional force.
When the objects are at rest, the interlocking of irregularities in the two surface of the object is higher than that of when objects are moving. When objects are moving there is dess interaction between their surfaces .