Why do the rain drops fall with constant speed during the later stages of their journey?
Correct answer: A. The air resistence just balances the force of gravity
- A. The air resistence just balances the force of gravity
- B. The force of gravity ois constant for all drops
- C. All drops fall from the same height
- D. The drops are small so force of gravity is negligible for them
Explanation
Terminal velocity, the steady speed achieved by an object freely falling through a gas or liquidLet's go into the imagination A raindrop falling through a ( air) ,When it just started falling, there was air resistance that was acting on itAs it continues its journey, air resistance increases until it becomes equal to the force of gravity Then the drop will have a constant speed and that speed is called terminal speed.Parachutes work on the same basis
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Fluid Dynamics
363 free Fluid Dynamics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Terminal Velocity questions
A tiny droplet of oil of density 'ρ' and radius 'r' falls through air under force of gravity. If viscosity of air is 'η', the terminal velocity acquired by the oil drop is given by:
The object that easily attains the terminal velocity is a
When an object moves with a terminal velocity, then the acceleration of the object will
The maximum drag force on a sphere falling with zero acceleration is 9.8 N its real weight is:
Eight drops of water, each radius 2mm are falling through air at a terminal velocity of 8cms-1. If they coalesce to form a single drop the terminal velocity of the combined drop will be:
A hail and a rain drop of the same radius are released from the same height, the rain drop will reach