Question

Match the following:
List I contains either an action or an observation. Match each of these, respectively to the correct effect, or a reason from list II.

List I	List II
a. Two rotating discs are brought in contact-coaxially	e. Generated force of friction is equal to applied external force
b. A contact force exists between a rough surface and a body placed on it	f. Rotational Kinetic Energy is transformed partially into heat
c. For a body on a rough surface, maintaining motion is easier as compared to initiating it	g. Attributed to resultant of normal reaction and coefficient of friction between the surfaces
d. Static friction is less than limiting friction	h. As kinetic friction is less than static friction

• A. a-f, b-g, c-h, d-e
• B. a-g, b-f, c-e, d-h
• C. a-h, b-e, c-f, d-g
• D. a-e, b-h, c-f, d-f

Answer 1

The correct option is A a-f, b-g, c-h, d-e

$a.$ Two rotating discs are brought in contact-coaxially- $f$.Rotational Kinetic Energy is transformed partially into heat.
$b.$ A contact force exists between a rough surface and a body placed on it- $g$.Attributed to resultant of normal reaction and coefficient of friction between the surfaces.
$c.$ For a body on a rough surface, maintaining motion is easier as compared to initiating it - $h$.As kinetic friction is less than static friction .
$d.$ Static friction less than limiting friction- $e$.Generated force of friction is equal to applied external force.