Question

PLEASE HELP :)

1) In which direction frictional force acts on a moving object?
2) What is drag?

3)The sole of shoes get worn out after using for a long time Explain why?

4) What happens when there is no friction between the chalk and blackboard?
5) Why do kabbadi players rub their hands in the soil?

Answer 1

1) in the opposite direction always
2) drag force is the force that acts in the opposite direction of the applied force (air resistance if a drag force for example)
3) frictions forces between the sole and the ground as the owner walks
4) chalk would glide very easily, so a creaking sound could never be produced, but also one could not write anything on the board!
5) I apologize for my lack of familiarity with the kind of sport but the probable answer is to raise the friction of their hands in order to decrease slipping and get a tighter, more firm grip