You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Work Done by Friction

In a figure s...

Question

In a figure shown below, the work done by force of friction on the block is

Zero

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Positive

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Negative

No worries! We‘ve got your back. Try BYJU‘S free classes today!

cannot be determined

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A Zero
Given, mass of block $(m) = 5 kg$
Applied force $(F) = 40 N$
By the FBD of the block:
$R = 5 g = 50 N$

$(f_{s})_{max} = μ_{s} R = 0.8 \times 50 = 40 N$

Since the external force and frictional force are equal and opposite, the body is at rest.
There is no displacement of the block.
The work done by force of friction is zero. ( $\Rightarrow W = f s = 0$ )

Hence option A is correct.

Suggest Corrections

Similar questions

Q. In the figure shown below, coefficient of friction between the

3 kg

block and ground varies with time and force acting on the block is given by

F = 5 t

. Then, work done by the friction force on the

2 kg

block upto

5 sec

, from the frame of reference of the

3 kg

block is:
[Take

g = 10 {m/s}^{2}

]

Q. A block of mass

1 k g

is pulled along the curve path

A C B

by a tangential force as shown in figure. The work done by the frictional force when the block moves from

A

B

Q. In the figure shown below, coefficient of friction between the

3 kg

block and ground varies with time as

μ = 0.02 t

and the force acting on the block is given by

F = 5 t

. Then, work done by the friction force on the

2 kg

block up to

5 sec

, from the frame of reference of the

3 kg

block is:
[Take

g = 10 {m/s}^{2}

]

Q. In the figure shown below, a

4 k g

block is compressed by

2 m

. The coefficient of friction between the block and the plane is

μ = 0.8

. Then the frictional force (in

N

) acting on the block is given by

Q. In the figure shown below, a

4 k g

block is compressed by

2 m

. The coefficient of friction between the block and the plane is

μ = 0.8

. Then the frictional force (in

N

) acting on the block is given by

Join BYJU'S Learning Program