if you want to remove an article from website contact us from top.

# a book of weight 20n is pressed between two hands and each hand exerts a force of 40n. if the book just starts to slide down. coefficient of friction is

Category :

### Mohammed

Guys, does anyone know the answer?

get a book of weight 20n is pressed between two hands and each hand exerts a force of 40n. if the book just starts to slide down. coefficient of friction is from screen.

## A book of weight 20 N is pressed between two hands and each hand exerts a force of 40 N . If the book just starts to slide down, then the coefficient of friction is

Click here👆to get an answer to your question ✍️ A book of weight 20 N is pressed between two hands and each hand exerts a force of 40 N . If the book just starts to slide down, then the coefficient of friction is Question

A

B

C

D

## 0.1

Medium Open in App Solution Verified by Toppr

Correct option is A)

We know:

frictional force =μ x normal force

Now,

The book is pressed by two 40 N force acting normal, and the book tends to slide down,

Thus, frictional force =2×μN

∴2×40μ=20⇒μ=0.25

Solve any question of Laws of Motion with:-

Patterns of problems

>

46 3

स्रोत : www.toppr.com

## A book of weight 20N is pressed between two hands and class 11 physics CBSE

A book of weight 20N is pressed between two hands and each hand exerts a force of 40 N If the book just starts to slide down then the coefficient of friction is A 025 B 02 C 05 D 01

A book of weight 20N is pressed between two hands and each hand exerts a force of 40 N. If the book just starts to slide down, then the coefficient of friction is:

A) 0.25 B) 0.2 C) 0.5. D) 0.1. Answer Verified 212.1k+ views

Hint:Friction is defined as the resistance to the motion of the body the coefficient of friction which works on the body is kinematic coefficient of friction if the body is in motion and the friction is static coefficient of friction if the body is at rest.Formula used:The formula of the friction force is given by,

f s =μ⋅N fs=μ⋅N Where μ μ

is the coefficient of friction and

N N

is the normal reaction.

The formula of weight is given by,

w=mg w=mg

Where m is the mass of the body and g is the acceleration due to gravity.

It is given in the problem that a book is held by two hands which weighs 20N and the applied force by each hand is 40N and we need to find the value of force for the condition when the book starts to slip down to the ground.

Here the friction force will be equal to the weight of the book,

⇒ f s =w ⇒fs=w

As the formula of the friction is given by,

f s =μ⋅N fs=μ⋅N Where μ μ

is the coefficient of friction and

N N

is the normal reaction.

Also the formula of weight is given by,

w=mg w=mg

Where m is the mass of the body and g is the acceleration due to gravity.

⇒μ⋅N=mg ⇒μ⋅N=mg

As the force applied by each hand is equal and the weight of the body is 20N.

⇒μ⋅(2×40)=20 ⇒μ⋅(2×40)=20 ⇒μ= 20 (2×40) ⇒μ=20(2×40) ⇒μ= 1 4 ⇒μ=14 ⇒μ=0⋅25 ⇒μ=0⋅25

The coefficient of friction is equal to

μ=0⋅25 μ=0⋅25 .

The correct answer for this problem is option A.Note:The formula of the friction is dependent on the coefficient of friction and normal reaction and the value of normal reaction is not always equal to the weight of the body; sometimes the applied force can also become the normal force as in this problem.

Crack NEET 2024 with top teachers

Live Interactive Classes

In-class doubt-solving

Practice tests and quizzes

Latest Vedantu courses for you

Grade 11 Science | CBSE | SCHOOL | English

CBSE PCM (2022-23)

ENGLISH

Unlimited access till final school exam

School Full course for CBSE students

500+ chapter specific short courses

Physics Chemistry Maths ₹9,000 per year Select and buy

Recently Updated Pages

Which element possesses the biggest atomic radii A class 11 chemistry JEE_Main

The highly efficient method of obtaining beryllium class 11 chemistry JEE_Main

Which of the following sulphates has the highest solubility class 11 chemistry JEE_Main

Amongst the metal Be Mg Ca and Sr of group 2 of the class 11 chemistry JEE_Main

Which of the following metals is present in the greencolored class 11 chemistry JEE_Main

To prevent magnesium from oxidation in the electrolytic class 11 chemistry JEE_Main

Trending doubts

Difference Between Plant Cell and Animal Cell

Write an application to the principal requesting five class 10 english CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

Write a letter to the principal requesting him to grant class 10 english CBSE

List out three methods of soil conservation

Change the following sentences into negative and interrogative class 10 english CBSE

A Short Paragraph on our Country India

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

What is the difference between anaerobic aerobic respiration class 10 biology CBSE

Related Questions Question 1

A cyclist riding with a speed of

27Kmph 27Kmph

. As he approaches a circular turn on the road of radius

80m 80m

, he applies brakes and reduces his speed at the constant rate of

0.50m s −1 0.50ms−1

every second. The net acceleration of cyclist on the circular turn is

Question 2 A body of mass 2kg 2kg

moves an acceleration

3m/ s 2 3m/s2

. The change in momentum in

1sec 1sec is A) 2 3 kgm/s 23kgm/s B) 3 2 kgm/s 32kgm/s C) 6kgm/s 6kgm/s D) None of these Question 3 A constant force F= m 1 g/2 F=m1g/2

is applied on the block of mass

m 2 m2

as shown in the figure. The string and pulley are light and the surface of the table is smooth. Find the acceleration of

m 2 m2 . Question 4 A block of mass m m

is placed on an inclined plane. With what acceleration

A A

towards the right should the system move on a horizontal surface so that

m m

does not slide on the surface of the inclined plane? Also, calculate the force supplied by the wedge on the block. Assume all surfaces are smooth.

स्रोत : www.vedantu.com

## A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If the block just starts to slide down Coefficient of friction is .

f(s) = mu(s) N ,mu = (f(s))/(N) = (mg)/(2F)A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If the block just starts to slide down Coefficient of friction is .

Home > English > Class 11 > Physics > Chapter >

Newtons Laws Of Motion

>

A book of weight 20N is presse...

A book of weight 20N 20N

is pressed between two hands and each hand exerts a force of

40N 40N

. If the block just starts to slide down Coefficient of friction is .

Updated On: 27-06-2022

Get Answer to any question, just click a photo and upload the photo and get the answer completely free,

UPLOAD PHOTO AND GET THE ANSWER NOW!

Text Solution Open Answer in App A 0.25 0.25 B 0.2 0.2 C 0.5 0.5 D 0.1 0.1 Answer

The correct Answer is A

Solution f s = μ s N,μ= f s N = mg 2F fs=μsN,μ=fsN=mg2F Answer

Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

## Related Videos 13075854 0 2.3 K 2:19 A book of weight 20N 20N

is pressed between two hands and each hand exerts a force of

40N 40N

. If the block just starts to slide down Coefficient of friction is . 576405389 0 5.4 K 1:54

A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If book just starts to slide down. Coefficient of friction is 612650306 0 6.1 K

A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If book just starts to slide down. Coefficient of friction is 391599298 0 800

A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If the book just starts to slide down. Coefficient of friction is 642823919 0 1.2 K

A book of weight 20 N is pressed between two hands and each hand exerts a force of 40 N. If book just starts to slide down. Coefficient of friction is 647725142 0 4.8 K 3:10

20 N भार के एक पुस्तक को दो हाथों के बीच में दबाया जाता है और प्रत्येक हाथ 40 N का बल लगाता है। यदि पुस्तक ठीक नीचे फिसलना प्रारम्भ करती है। घर्षण गुणांक का मान क्या है?

Add a public comment...

Popular Chapters by Class:

Class 6 Algebra

Basic Geometrical Ideas

Data Handling Decimals Fractions Class 7

Algebraic Expressions

Comparing Quantities

Congruence of Triangles

Data Handling

Exponents and Powers

Class 8

Algebraic Expressions and Identities

Comparing Quantities

Cubes and Cube Roots

Data Handling

Direct and Inverse Proportions

Class 9

Areas of Parallelograms and Triangles

Circles Coordinate Geometry Herons Formula

Introduction to Euclids Geometry

Class 10

Areas Related to Circles

Arithmetic Progressions

Circles Coordinate Geometry

Introduction to Trigonometry

Class 11 Binomial Theorem

Complex Numbers and Quadratic Equations

Conic Sections

Introduction to Three Dimensional Geometry

Limits and Derivatives

Class 12

Application of Derivatives

Application of Integrals

Continuity and Differentiability

Determinants

Differential Equations