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This mock test of Friction Force MCQ Level - 1 for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Friction Force MCQ Level - 1 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

What is the minimum stopping distance for a vehicle of mass * m* moving with speed

Solution:

The correct answer is:

QUESTION: 2

Car is accelerating with acceleration is 20*m/s*^{2}. A box of mass *m* = 10*kg* that is placed inside the car, it is put in contact with the vertical wall of car as shown. The friction coefficient between the box and the wall is μ = 0.6

Solution:

The breaking force is insufficient, so the block will not slide.

So friction force = 100 N

and acceleration will be 20 m/sec^{2}

Net contact force on the block

The correct answer is: The friction force acting on the box will be 100 *N*

QUESTION: 3

A horizontal force of 10N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the walls is 0.2. The weight of the block is (*g *=10*m*/*s*^{2})

Solution:

Force F = μR = mg

Weight of block

The correct answer is: 2 *N*

QUESTION: 4

A bead of mass * m* is located on a parabolic wire with its axis vertical and vertex directed towards downwards as in figure and whose equation is

Solution:

For the sliding not to occur when

The correct answer is: **0.25 μ^{2}a**

QUESTION: 5

A block *A* of mass 2 *kg* rest on another block *B* of mass 8 *kg* which rests on a horizontal floor. The coefficient of friction between *A* and *B* is 0.2 while that between *B* and floor is 0.5. When a horizontal force of 25 *N* is applied on the block *B*. The force of friction between *A* and *B* is :

Solution:

frictional force on *B
B* will not slide on ground. So force = 0.

The correct answer is: zero

QUESTION: 6

A smooth block is released at rest on a 45° incline and then slides a distance * d*. The time taken to slide is

Solution:

When friction is absent a_{1} = g sin θ

When friction is present

From Eq. (1) and (2)

(∴ t_{2} = nt_{1})

The correct answer is:

QUESTION: 7

A weight * w* is to be moved from the bottom to the top of an inclined plane of inclination

Solution:

The correct answer is:

QUESTION: 8

A chain of length *L* is placed on a horizontal surface as shown in figure. At any instant * x* is the length of chain on rough surface and the remaining portion lies on smooth surface. Initially

Solution:

For chain to move with constant speed *P* needs to be equal to frictional force on the chain. As the length chain on the rough surface increases. Hence, the friction force f_{k} = μ_{k}N increase.

Hence, magnitude of *P* should increase with time.

The correct answer is: The magnitude of *P* should increase with time

QUESTION: 9

A box ‘*A*’ is lying on the horizontal floor of the compartment of a train running along horizontal rails from left to right. At time ‘*t*’, it decelerates. Then the resultant contact force *R* by the floor on the box is given best by :

Solution:

Acceleration of train will be from right to left.

⇒ Pseudo force will act on the box from left to right therefore friction will act from right to left.

The correct answer is:

QUESTION: 10

If the coefficient of friction between *A* and *B* is μ the maximum horizontal acceleration of the wedge *A* for which *B* will remain at rest with respect to the wedge is :

Solution:

*FBD* of block *B* w.r.t. wedge *A*, for maximum *a* perpendicular to wedge :

The correct answer is:

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