Question

A body moves on a rough surface with uniform velocity.The force applying on the body is equal to ?

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

The force applied on the body is equal to the frictional force provided by the surface which is equal to $\mu * N.$

Explanation:

$\mu * N$ is the frictional force applied to a body by a rough surface.

$\mu$ is the coefficient of kinetic friction.

$N$ is the normal force applied on the body by surface.

Force provides acceleration to the body which makes the velocity of the body to either increase or decrease. According to the first law of motion, for a body to be in a state of uniform velocity or rest, the net force on the body must be zero.

Therefore, for the body to be in a state of uniform velocity, the force applied to it must cancel the other force i.e. frictional force.

Thus, the force applied to the body is equal to the frictional force provided by the surface which is equal to $\mu * N.$

[If other forces like air drag is also acting on the body, applied force must also cancel these and move in a straight line for the body to attain a uniform velocity.]

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