Question 1

It is difficult to walk on any oily floor because
A)Floor gets spoiled
B)There is more resistance
C)Force of friction is high
D)Force of friction is very less

Accepted Answer

The difficulty in walking on an oily floor is due to the reduction in the force of friction between the floor and the feet, making it slippery.

Question 2

Spring balance is a device used for measuring the _____________ acting on an object.
A)mass
B)pressure
C)force
D)None of the above

Accepted Answer

A spring balance measures the force acting on an object due to gravity, which is often interpreted as the weight of the object.

Question 3

A matchstick struck on a matchbox catches fire easily because
A)Friction may cause fire
B)Of chemical reaction
C)Force heated the match stick
D)None of the above

Accepted Answer

Friction between the matchstick and the matchbox generates heat, which ignites the chemicals on the matchstick head, causing it to catch fire.

Question 4

Tyres are treaded to
A)To look good
B)Increase friction
C)To increase its longivity
D)To increase weight of the tyre

Accepted Answer

Treads on tyres are primarily designed to increase friction between the tyre and the road, enhancing grip and safety, especially in wet conditions.

Question 5

Lubricants are substances which
A)Increases friction
B)Are used to light fire
C)Reduces friction
D)Are used to put off fire

Accepted Answer

Lubricants are substances that are applied to surfaces to reduce the friction between them, making movement smoother and reducing wear and tear.

Question 6

Sliding friction is _________ than / to rolling friction
A)smaller
B)greater
C)equal
D)None of the above

Accepted Answer

Sliding friction is greater than rolling friction because in sliding friction, the entire surface of the object is in contact with the surface it is sliding on, while in rolling friction, only a small portion of the object's surface is in contact with the surface it is rolling on.

Question 7

The frictional force exerted by fluids is also called ______
A)drug
B)drag
C)drop
D)drown

Accepted Answer

The frictional force exerted by fluids is called "drag." This force opposes the motion of an object through a fluid (like air or water).

Question 8

Four children were asked to arrange forces due to rolling, static and sliding frictions in a increasing order. Their arrangements are given below. Choose the correct arrangement.
A)Rolling, Static, Sliding
B)Static, Rolling, Sliding
C)Rolling, sliding, static
D)Sliding, Static, Rolling

Accepted Answer

Rolling friction is generally less than sliding friction, which in turn is usually less than static friction. This means that the force required to start moving an object (static friction) is greater than the force required to keep it moving once it has started (sliding friction), and rolling an object requires even less force than sliding it.

Question 9

A boat or an aeroplane has a pointed or tapering front / head. Why?
A)To increase the friction of fluid
B)To reduce the friction of fluid
C)To look good
D)For no reason

Accepted Answer

The pointed or tapering front of a boat or an airplane is designed to reduce the friction of fluid (water or air), allowing for smoother and more efficient movement through the medium.

Question 10

The sole of the shoes becomes plain after wearing it for several months. The reason is
A)Wearing out due to friction
B)Wearing out due to no friction
C)Sole is of bad quality
D)None of the above

Accepted Answer

The sole of shoes wears out due to friction between the sole and the ground as you walk or run. This friction causes the material of the sole to gradually erode, leading to a smoother, more worn appearance over time.

Quiz 1: Friction and Its Applications

It is difficult to walk on any oily floor because

Spring balance is a device used for measuring the _____________ acting on an object.

A matchstick struck on a matchbox catches fire easily because

Tyres are treaded to

Lubricants are substances which

Sliding friction is _________ than / to rolling friction

The frictional force exerted by fluids is also called ______

Four children were asked to arrange forces due to rolling, static and sliding frictions in a increasing order. Their arrangements are given below. Choose the correct arrangement.

A boat or an aeroplane has a pointed or tapering front / head. Why?

The sole of the shoes becomes plain after wearing it for several months. The reason is