Matching block type
LIST - I
(a) Two rotating discs are brought in contact coaxially
(b) Contact force on a body placed in on rough surface
(c ) To continue a motion is easier than to initiate the motion
(d) For a Static friction less than limiting friction
LIST - II
(e ) Generated friction is equal to appliedexternal force in magnitude
(f) Loss of Rotational KE is transformed partly to heat
(g) The resultant of normal reaction and friction
(h) Kinetic friction is less than static friction

Options

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-g, d-f

Answer

To solve the matching problem between LIST - I and LIST - II, we will analyze each statement from LIST - I and find the corresponding statement in LIST - II based on the principles of physics related to motion and friction.

### Step-by-Step Solution:

1. **Statement (a): Two rotating discs are brought in contact coaxially.**
- When two rotating discs come into contact, they will experience friction between their surfaces. This friction will result in a loss of rotational kinetic energy, which is partly transformed into heat due to the work done against friction.
- **Match:** (a) → (f) (Loss of rotational KE is transformed partly to heat).

2. **Statement (b): Contact force on a body placed on a rough surface.**
- A body on a rough surface experiences contact forces, which include the normal reaction force and the frictional force. The resultant of these forces is what keeps the body in equilibrium or allows it to move.
- **Match:** (b) → (g) (The resultant of normal reaction and friction).

3. **Statement (c): To continue a motion is easier than to initiate the motion.**
- This statement refers to the difference between static and kinetic friction. It is generally easier to keep an object moving (kinetic friction) than to start moving it from rest (static friction).
- **Match:** (c) → (h) (Kinetic friction is less than static friction).

4. **Statement (d): For static friction less than limiting friction.**
- Static friction can vary from zero up to a maximum value known as limiting friction. When the applied force is less than the limiting friction, the static friction matches the applied force.
- **Match:** (d) → (e) (Generated friction is equal to applied external force in magnitude).

### Final Matches:
- (a) → (f)
- (b) → (g)
- (c) → (h)
- (d) → (e)