Question

If the number of teeth in the driven gear of a vehicle is less than that of the driving gear, the vehicle

• A. Loses speed
• B. Gains speed
• C. Gains momentum
• D. Both (b) and (c)

Answer 1

The correct option is D

Both (b) and (c)

1. When the bigger wheel drives the smaller wheel, i.e. when the driving gear has more teeth than the driven gear, a gear system can be employed to achieve speed.
2. The gear ratio must be greater than one to gain a speed increase.
3. The gain in speed is calculated as the number of teeth in the driving wheel divided by the number of teeth in the driving wheel.
4. The vehicle gains speed and momentum when the number of teeth in the driving gear is less than the number of teeth in the driving gear.
   Hence Option C is the correct answer i.e. If the number of teeth in the driven gear of a vehicle is less than that of the driving gear, the vehicle Gains speed and momentum