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1.
The sole of the shoes becomes plain after wearing it for several months. The reason is
2.
A boat or an aeroplane has a pointed or tapering front / head. Why?
3.
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.
4.
The frictional force exerted by fluids is also called ______
5.
Sliding friction is _________ than / to rolling friction
6.
Lubricants are substances which
7.
Tyres are treaded to
8.
A matchstick struck on a matchbox catches fire easily because
9.
Spring balance is a device used for measuring the _____________ acting on an object.
10.
It is difficult to walk on an oily floor because