hots
1. if you try to hold a glass with oil on your hand , it tends to slip . why ?
2. when you rub your  hands together , they become warm. what is this due to ?

Dear Student,

Kindly ask different queries in different thread. Also, refer the solution of 1st question.

If you try to hold a glass with oil on your hands it tends to slip because the oil fill the irregularities and the friction is reduced thats why it slips.

Regards