Sliding friction is less than the frictional force required to move the object so it's less than 7N

The value of sliding friction for an object can be determined by the force required to move the object from rest. In this case, the object requires 7 N of force to be moved from rest. Based on this information, we can conclude that the value of sliding friction for the object is less than 7 N.

Explanation:

Sliding friction is a type of friction that occurs when two solid surfaces slide against each other. It opposes the motion of the object and acts parallel to the surfaces in contact. The force of sliding friction can be calculated using the equation:

Frictional force (F) = coefficient of friction (µ) * normal force (N)

In this case, we are given the force required to move the object from rest, which is 7 N. This force is equal to the frictional force acting on the object.

Now, let's consider the options:

a) 7 N: This option suggests that the value of sliding friction is equal to the force required to move the object. However, this contradicts the given information that the force required is 7 N. Therefore, this option is incorrect.

b) Greater than 7 N: This option suggests that the value of sliding friction is greater than the force required to move the object. However, this is not possible as the force required to move the object is already given as 7 N. Therefore, this option is incorrect.

c) Less than 7 N: This option suggests that the value of sliding friction is less than the force required to move the object. This is the correct option based on the given information. The object requires 7 N of force to overcome the sliding friction and start moving. Therefore, the value of sliding friction is less than 7 N.

d) 14 N: This option suggests that the value of sliding friction is equal to twice the force required to move the object. However, this contradicts the given information that the force required is 7 N. Therefore, this option is incorrect.

In conclusion, the correct answer is option 'c' - Less than 7 N. The value of sliding friction is less than the force required to move the object from rest.