Final answer:
Using a lower gear helps reduce speed and brake when driving downhill.
Step-by-step explanation:
Using a lower gear helps reduce speed and brake when driving downhill. This is true.
When driving downhill, the force of gravity pulls the vehicle forward, increasing its speed. By shifting to a lower gear, you can take advantage of the engine's resistance and use it to slow down the vehicle. This is known as engine braking. It helps prevent the brakes from overheating and wearing out quickly.
For example, imagine you are driving downhill in a car with an automatic transmission. If you shift from 'Drive' to '2' or 'L' (low gear), the engine will help slow down the car, reducing the need for constant braking.