Take a look at a bicycle with gears. Using what you have just learned, answer the following questions:

a. Which gear combination would you like to use when you want to pedal with as few strokes as possible and have your wheels turn as many times as possible?


b. Now you are going up a hill and want to maximize the force you deliver to the wheel. You aren’t concerned with how many strokes you are making, but you want to get as much force to the wheel as possible. Which gear combination would you use now, and why?

Answer:

answer a: a large front gear with a small back gear

answer b: a small front gear with a large back gear

Explanation:

just simple gearing ratios

To rotate wheels turn many times with few strokes a large front gear with a small back gear is required and to minimize the force a small gear in the front and the large back gear are required. So, when a large amount of energy is applied the bicycle moves more as compared to less energy applied.

Toothed wheel mounted to a spinning shaft, used as a machine part. With the teeth from one gear engaging the teeth of the other gear, gears work together to transfer and modify rotational movement and tension (turning force) without slipping. The ratios of rotational speeds and shaft torques are constant when a pair of matching gears have teeth that are aligned in circles, or when the gears are serrated wheels. Speed control and torque ratios result from the arrangement of the teeth on non-circular bodies.

Typically, gears are round. Gear teeth's contact surfaces need to be precisely formed to a particular profile in order to transfer movement easily and with a steady speed proportion at every moment.

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