QUIZ ON FRICTION

Friction is a __________

• Contact force

• Non-contact force

• Magnetic force

• Electric force

Lubricants help to ________

• Increase friction

• Reduce friction

The shape of the airplane is like a

• Fish

• Car

• Bird

• Any one of these

Friction is a

• evil

• necessity

• either evil or necessity

• both evil and necessity

A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may

• spread a carpet on the wooden surface.

• cover the ball with a piece of cloth.

• sprinkle talcum powder on the wooden surface.

• sprinkle sand on the wooden surface

In the figure a boy is shown pushing the box from right to left. The force of friction will act on the box

• from right to left (←)

• from left to right (→)

• vertically downwards (↓)

• vertically upwards (↑)

Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

• only if the objects are solid.

• only if one of the two objects is liquid.

• only if one of the two objects is gaseous.

• irrespective of whether the objects are solid, liquid or gaseous

If we apply oil on door hinges, the friction will

• increase

• decrease

• reduce to zeo

• remain unchanged

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

• muddy surface

• polished marble surface

• cemented surface

• brick surface

While playing tug of war game, Swati felt that the rope was slipping through her hands. She should apply___ to prevent the slipping of rope.

• oil

• soil