Define Belt Drive.

A belt drive uses a flexible belt to connect two or more rotating shafts mechanically, transmitting power efficiently over long distances.

A chain drive uses a roller chain to transmit mechanical power from one sprocket to another, commonly found in bicycles and motorcycles for robust power transfer.

A gear drive uses meshed gears to transmit rotational motion and torque between shafts, allowing for changes in speed and direction.

1b. State two (2) uses of gear.

• Gears are used to change the speed of rotation between shafts.

• Gears are used to change the direction of rotation of a shaft.

2b. Differentiate between supplementary and complementary angle.

Complementary angles are two angles whose sum is equal to $90^\circ$. For example, $30^\circ$ and $60^\circ$ are complementary angles.

Supplementary angles are two angles whose sum is equal to $180^\circ$. For example, $70^\circ$ and $110^\circ$ are supplementary angles.