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Normal Force

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a body of mass m lies at rest rough surface.the frictional force i

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Q. A body of mass

m

lies at rest on a rough horizontal surface. The frictional force acting on he body is

Q. Read the following two statements and then identify the correct choice of the given answers.
A : The frictional force acting on a body of mass m which is at rest on a horizontal surface of coefficient of static friction

^{'} μ_{s}^{'}

μ_{s} m g

in the absence of external force.
B : The frictional force acting on a body of mass m which is at rest on a rough inclined surface of angle of inclination

θ

θ

.

Q. A force is acting on a body of mass

3 k g

kept on a rough horizontal surface. If a friction force of

40 N

is required to keep the body at rest under the action of this external force. Find the contact force acting on the body. (Take

g = 10 m / s^{2}

)

Q. A body of mass 2 kg rests on a rough inclined plane making an angle 30

^{\circ}

with the horizontal. The coefficient of static friction between the block and
the plane is 0.7. The frictional force on the block is:

Q. A force is acting on a body of mass

3 k g

kept on a rough horizontal surface. If a friction force of

40 N

is required to keep the body at rest under the action of this external force. Find the contact force acting on the body. (Take

g = 10 m / s^{2}

)

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