Question

The opposing force that is caused due to relative motion between two surfaces in contact is called.......................
$\left( A \right){\text{ Friction}}$
$\left( B \right){\text{ Electrostatic}}$
$\left( C \right){\text{ Magnetic}}$
$\left( D \right){\text{ Electromagnetic}}$

Answer 1

Hint: This force will continuously act in the direction opposed to that of the force being applied. And also the loopholes among the two surfaces will latch into each other, and therefore it will face any further motion even though no outer force will be applied to stop the moving body.

Complete Step By Step Answer:
Here in the question, we have a statement which is saying that we have to name the opposing force which is caused by the relative motion between two surfaces in contact. And it is caused due to the frictional force.
It is a result that upholds symmetry between two surfaces. Whenever any outer effect tries to encourage motion among the surfaces, friction acts in such a way, that the change is equalized, and the surfaces remain as they were.
Hence, the option $\left( A \right)$ is the correct answer.

Note:
There are two classes of friction i.e., the first one is dynamic friction when one body is already descending over the other. And the other one is static friction when the body is just going to slip or there is a propensity to slip.