Friction Quiz

Which of the following methods can be used to

increase friction between 2 surfaces?

• Applying lubricants between surfaces

• Using powder between surfaces

• Making grooves on surfaces

• Using ball bearings

It is easier to drag a wheel than to roll it

• True

• False

Which of the following methods will reduce air drag ?

• Using ball bearings

• Polishing

• Using lubricants

• streamlining

In case of ice skating :- replacing ice surface with grass will make no difference

• True

• False

Since rolling friction is less than sliding friction,sliding friction is replaced with rolling friction in most machine using ball bearings

• True

• False

Which of the following will help us walk on on ground ?

• Buoyant Force

• Drag

• Weight

• Frictional Force

A block kept on ground require 10N of horizontal force .To just start moving.If we apply a force of 5N on the block in horizontal direction. what will be the magnitude of frictional force acting on it?

• 20N

• 5 N

• 10 N

• 0 N

Applying lubricants to machines increase their effeciency

• True

• False

Arrange the order in increasing order of surface Roughness.

sandpaper

cardboard

polished steel

• sandpaper < cardboard < polished steel

• polished steel < sandpaper <cardboard

• cardboard <sandpaper < polished steel

• polished steel < cardboard < sandpaper

Statement1:Rough surfaces generally have more friction between them.

Statement2:When we attempt to slide one surface over another ,we have to apply a force to overcome interlocking between the irregularities present on the surfaces .

Choose the correct option

• Statement 1 is correct but statement 2 is incorrect

• Both the statement are incorrect

• Statement 1 is incorrect but statement 2 is correct.

• Both the statement are correct