1. The hinges of creaking doors are oiled to:

2. A matchstick catches fire when struck against the side of the matchbox because:

3. Which of the following is true about friction:

4. Talcum powder should not be spilled on the floor of room because:

5. The easiest way to move a heavy wooden crate is to:

6. The two common forces that are acting everywhere around us are:

7. If we apply the force along the right, the friction acts along the:

8. Which of the following is true:

9. Gymnasts apply some coarse substance on their hands to:

10. In which of the following friction is troublesome: