Educational worksheet on gears, covering types, functions, and applications in mechanical systems.

(a)
(i) Gear
(ii) Gear Train
(iii) Torque
(iv) Input Gear
(v) Output Gear
(vi) Axle rod

(b)
| Product | a | b | c | d | e | f |
|---------------|---|---|---|---|---|---|
| Tractor | | ✓ | | | ✓ | |
| Wrist Watch | ✓ | | | | | |
| Pedal Go Kart | | | ✓ | | | |
| Power Drill | | | | ✓ | | |

Brief explanations:
a. A wristwatch requires very high RPM for its internal mechanisms to keep accurate time.
b. A tractor needs high torque to pull heavy loads or work in difficult terrain.
c. A pedal go-kart uses gears to increase the speed of the rear wheel relative to the pedaling speed.
d. A power drill requires a manual input (the trigger) to control the rotation speed of the chuck.
e. A tractor engine produces high torque output, which is transferred through the gearbox to the wheels.
f. A power drill converts electrical energy directly into rotational motion at the drill bit.

(c)
B: Clockwise
C: Anti-clockwise