# Selina Solutions Class 9 Physics Solutions for Exercise 5A in Chapter 5 - Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation

Question 13 Exercise 5A

A bunch of feathers and a stone of the same mass are released simultaneously in the air. Which will fall faster and why? How will your observation be different if they are released

simultaneously in a vacuum?

The feathers fall much after the stone falls because of air friction. The observation will be different in a vacuum as there is no friction in air because of the absence of air. As a result of which the acceleration due to gravity acting on both bodies will be the same and hence the feathers and the

stone will fall at the same time without any delay

Video transcript
"students welcome to lado learning this is ashwini i teach science at leader so here in this question when a bunch of feeders and a stone of the same mass are released simultaneously in the air which will fall faster and why how will you observe be different how your observation will be different if they are released simultaneously in a vacuum so here the answer is when we are capping like stone at one hand and feed us at the other end of the same mass like of one kg okay so this stone is also one kg and this feeds the feeders combinedly collectively have them having their weight as one kg so when we are dropping them in air the feeders fall much after the stone like the stone will fall fastly so why is it so because there is air friction in the air there are so much particles in here right so that particles will be an obstacle for feeders and they are applying some force on feeders right and stone is somewhat much more heavy and a single body so it will not going to release and it will not going to stop and it will fall faster because this particles having less weight but this feeders are much more in number and there are so many air particles due to which the air friction is acting on this now if i'm talking about the vacuum then vacuum does not have any air or any kind of particle so there will be acceleration due to gravity which is acting both which is acting same on body object because there is no air particle a vacuum is totally vacant there is nothing so when we are dropping stone and we are dropping feeders then bath will fall at the same time because there is no air particle no air or nothing except these two objects so acceleration due to gravity will acting same on both the object and both will be falling at the same time in a vacuum so i hope everything is clear to you if you have any doubt then please put it down in the comment section for more such video solutions please subscribe leader learning thank you"
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