give two examples where friction is used to: 
a] produce fire
b] hold two or more objects

Dear Dhruvika,
a)when we strike a matchstick against the side of a matchbox, a fire is produced.
b)when we are holding two or more objects in one hand, it is due to the friction that we are able to do it.
Hope this solves your doubts.
Regards,
Sagnik.