# Multiple Choice Questions (MCQ) on friction

Multiple Choice Questions (MCQ) on friction

The force of friction acts in a direction _____ to the direction of motion of object.

1. Same
2. Opposite
3. Perpendicular
4. Downwards

(Ans:b)

The force of friction depends upon

1. Nature of surface of contact
2. Material of objects in contact
3. Both ‘a’ and ‘b’
4. None of the above

(Ans:c)

The body will move only when

1. Force of friction = applied force
2. Force of friction < applied force
3. Force of friction > applied force
4. All of the above

(Ans:b)

The ratio of the limiting force of friction (F) to the normal reaction (R) is known as

1. Coefficient of friction
2. Force of friction
3. Angle of friction
4. None of the above

(Ans:a)

The coefficient of friction (µ) is equal to

1. TanΦ
2. SinΦ
3. CotΦ
4. CosΦ

Where Φ = angle of friction

(Ans:a)

The force of friction (F) is equal to

1. µR/2
2. µR
3. 2µR
4. µR/3

(Ans:b)

The value of Normal reaction (R) for the following figure is

1. W – PSinθ
2. W + PSinθ
3. P – WSinθ
4. P + WSinθ

Where, W = Weight of block, P = Applied force, µ = Coefficient of friction, θ = Angle

(Ans:a)

When the two surfaces in contact have a thick layer of lubricant in between them, it is known as

1. Solid friction
2. Rolling friction
3. Greasy friction
4. Film friction

(Ans:d)

When the two surfaces in contact have a very thin layer of lubricant in between them, it is known as

1. Solid friction
2. Rolling friction
3. Greasy friction
4. Film friction

(Ans:d)