1. It is difficult to walk on an oily floor because:

2. Spring balance is a device used for measuring the _____________ acting on an object.:

3. A matchstick struck on a matchbox catches fire easily because:

4. Tyres are treaded to:

5. Lubricants are substances which:

6. Sliding friction is _________ than / to rolling friction:

7. The frictional force exerted by fluids is also called ______:

8. Four children were asked to arrange forces due to rolling, static and sliding frictions in an increasing order. Their arrangements are given below. Choose the correct arrangement.:

9. A boat or an aeroplane has a pointed or tapering front/ head. Why?:

10. The sole of the shoes becomes plain after wearing it for several months. The reason is: