Question

Fill in the gap using given analogy.(i) Momentum conservation : F = 0 (ii) Uniform motion in rough surface : _________.
a. Frictional force
b. Non-zero force
c. Internal force d. Gravitational force​

Answer 1

Answer:

$Internal \: force$

Answer 2

The gap is filled using the given analogy as follows:

Momentum conservation : F = 0 (ii) Uniform motion in rough surface : b. Non-zero force.

• Momentum can be conserved only when the external force in the system is zero.
• Uniform motion is the motion whose velocity remains constant.
• Here it is given that the surface is rough, which means the frictional force is acting on this body. And this frictional force reduces the velocity of the body.
• So, for uniform motion on a rough surface, a non-zero force is required.