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Question

Difficulty: MediumWheel and Axle

Match each real-world mechanism to its correct functional 'wheel' and 'axle' components based on how it operates.

  • Manual ScrewdriverWheel = Outer wide grip; Axle = Narrow metal shaft engaging the fastener
  • Bicycle Rear Wheel AssemblyWheel = Outer tire and rim; Axle = Central toothed gear (sprocket) driven by a chain
  • Hand-cranked Water Well (Windlass)Wheel = Circular path traced by the handle; Axle = Central drum that winds the rope
  • Ceiling FanWheel = Extended rotating blades; Axle = Central motorized spindle

Answer

Manual Screwdriver matches 'Wheel = Outer wide grip; Axle = Narrow metal shaft'. Bicycle Rear Wheel Assembly matches 'Wheel = Outer tire and rim; Axle = Central toothed gear'. Hand-cranked Water Well matches 'Wheel = Circular path traced by the handle; Axle = Central drum'. Ceiling Fan matches 'Wheel = Extended rotating blades; Axle = Central motorized spindle'.
Each mechanism is correctly categorized by identifying the component with the larger rotational diameter as the wheel and the smaller central component as the axle, accurately reflecting how they transmit rotational force and speed.

Step-by-Step Solution

1
Define the physical characteristics of a wheel and axle system.
The 'wheel' is always the component or path with the larger radius, and the 'axle' is the rigidly attached component with the smaller radius.
Establishing the definitions allows us to look past the physical shape of the object and focus on its mechanical function.
2
Analyze tools designed to multiply force (Screwdriver and Windlass).
In these tools, effort is applied to the larger radius (the wide grip or the crank's path) to turn the smaller radius (the shaft or the drum) with greater force.
Identifying where the effort is applied helps determine which part acts as the wheel.
3
Analyze mechanisms designed to multiply speed or distance (Bicycle and Ceiling Fan).
In these systems, effort is applied to the smaller central radius (the sprocket or the motor spindle), which forces the larger radius (the tire or the blades) to spin faster and cover more distance.
This confirms the axle is driving the wheel in these specific applications.

Key Concept

In a wheel and axle simple machine, the 'wheel' is the component with the larger diameter, and the 'axle' is the connected component with the smaller diameter. A wheel does not have to be a solid disk; it can be a crank path or fan blades.
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Topics

Wheel and Axle

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