Set-1 1. What is meant by maximum static friction? (A) 2. Why maximum static friction is more than the kinetic friction?(A) 3. Why do more accident occur during rainy season?(B) 4. You can move heavy boxes by sliding them over the ground. Or you can put them on a trolly, like the one in the Figure below, and then roll them over the ground. Explain which way makes it easier to move the boxes.. why?
Answers
Answer:
Explanation:
Coefficient of static friction is always greater than the coefficient of kinetic friction because interaction between the surfaces is more established when the surfaces are at rest. But as normal forces can change, so same not hold in case of friction forces.
The maximum friction can be generated between two static surfaces in contact with each other. Once a force applied to the two surfaces exceeds the limiting friction, motion will occur. For two dry surfaces, the limiting friction is a product of the normal reaction force and the coefficient of limiting friction. So as coefficient of static friction is always greater than the coefficient of kinetic friction, therefore, limiting friction force is a product of the normal reaction force and the coefficient of static friction,Hence can never be less than static friction and always greater than kinetic friction.