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Byju's Answer

Standard VIII

Physics

Free Body Diagram

A block of ma...

Question

A block of mass $m$ is at rest under the action of $F$ against the wall as shown in Figure. Which of the following statement is incorrect?

f = m g

[where

f

is the friction force]

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F = N

[where

N

is the normal force]

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F

will not produce torque

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N

will not produce torque

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Solution

The correct option is D $N$ will not produce torque

As this body is in equilibrium the net force and net forque on it must be zero.
Now,
About centre of mass the net forque on it must be zero.
Also,
The actual profile of normal reaction will be like figure (ii) to make net forque zero.

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Similar questions

Q. A block of mass

m

is at rest under the action of force

F

against a wall as shown in figure. Which of the following statement is incorrect ?

Q. As given in the figure two blocks

A

B

of weight

20 N

and

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respectively are in equilibrium. These are being pressed against a wall by force

F

as shown. If the coefficient of friction between the two blocks is

0.1

and between block

B

and the wall is

0.15

, the frictional force applied by wall on block

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and the frictional force applied by block

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on block

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is pressed against a wall by two perpendicular horizontal forces as shown in the figure.

F_{1}

is perpendicular to the wall and

F_{2}

is parallel to the wall.

μ_{s} = 0.8, μ_{k} = 0.5

and

g = 10 {ms}^{- 2}

For

F_{1} = 75 N

and

F_{2} = 30 N

, the block remains at rest on the wall. Then, the force of friction (in

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A block of mass m is at rest under the action of F against the wall as shown in Figure. Which of the following statement is incorrect?

The correct option is D N will not produce torqueAs this body is in equilibrium the net force and net forque on it must be zero.Now,About centre of mass the net forque on it must be zero.Also, The actual profile of normal reaction will be like figure (ii) to make net forque zero.

A block of mass $m$ is at rest under the action of $F$ against the wall as shown in Figure. Which of the following statement is incorrect?

The correct option is D $N$ will not produce torque

As this body is in equilibrium the net force and net forque on it must be zero.
Now,
About centre of mass the net forque on it must be zero.
Also,
The actual profile of normal reaction will be like figure (ii) to make net forque zero.