The maximum drag force on a sphere falling with zero acceleration is 9.8 N its real weight is:
Correct answer: B. 9.8 N
- A. Zero
- B. 9.8 N
- C. 4.9N
- D. 19.6N
Explanation
The drag force experienced by an object falling with zero acceleration is equal to the weight of the object. Therefore, if the maximum drag force on a sphere falling with zero acceleration is 9.8N, its real weight is also 9.8N.
This question appeared on the ETEA MDCAT 2010 paper, which you can sit online with every answer explained.
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About Terminal Velocity
Terminal velocity is the constant speed reached when gravitational force is balanced by fluid resistance. The topic covers drag, buoyant force, the conditions for zero acceleration, and how viscosity, object size, shape and density affect the limiting speed, with a distinction between free fall before and after terminal velocity.
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