friction

Which one of these characteristics does a smooth surface has?

• Less frictional force

• More frictional force

• none of these

• both a and b

Rolling friction is smaller than?

• Sliding friction

• Static friction

• Fluid friction

• All of the above

Friction always ____________

• . helps the motion

• opposes the motion

• both of these

• none of these

What kind of substances are known as lubricants

• Increase friction

• Decrease friction

• Increase or decrease friction

• None of these

Fluid are____

• Gases

• Liquids

• Gases and liquids both

• None of these

why a carrom board is powdered before playing?

• to reduce friction

• to increase the friction

• for decoration

• for fragrance

which force prevents us from slipping while walking on the road?

• gravity

• frictional force

• balanced forces of nature

• none of the above

which of the following activity is easier to perform on a 10kg drum?

• dragging a drum,

• lifting a drum

• rolling a drum

• all needs same effort

which of the following surface will have least friction

?

• glass

• paper

• cardboard

• wood

a toy car released with same initial speed will travel the farthest on

• muddy surface

• cemented surface

• polished marble surface

• brick surface