Friction Test -...

Match the following

After an aeroplane completes a voyage, its muzzle feels warmer than the middle and back portion of the main body. This is because:

A ball is rolled on four surfaces:
a) marble floor,  
b) on sand,  
c) on cloth, 
d) on wood.
The force of friction acting on the ball on these different surfaces in descending order will be:

If we drop a cup of water on a plate and a cup of oil on another plate, water is seen to spread faster along diameter. This is an example related to:

A car will skid more on a wet road than on a dry road and the car tyres there is more:

What measures are taken to reduce fluid friction in aeroplanes?

Why are efforts made to reduce friction?

When two surfaces are coated with lubricant, then they will:

Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be

The depressions and elevations present on the surface of objects causes friction.