IF You drop 1 KG cotton and 1 Kg iron together from a roof of a building .which one reach first to ground?

Answer 1

BOTH MUST HIT THE GROUND AT THE SAME TIME UNLESS AN XTERNAL FORCE IS APPLIED LIKE WIND
THE HEIGHT THAT BOTH HAVE TO TRAVEL MUST BE THE SAME

Answer 2

There is insufficient information to make a single answer.
1. The existence of air or some other fluid is not specified.
2. The shape of the two objects is not specified.
The differential equations that describe how the two objects will move are significantly different with different details specified for these two missing constraints.

With no fluid present the only forces affecting the objects is their weight. The shape is irelavant in this case. The two objects have the same mass since they have the same weight. They each would accelerate at the same rate and reach the ground at the same time.

With any fluid present The shape becomes important and forces other than gravity begin to affect the outcome.

If for example both objects are spherical with no cavities inside then because iron has a greater density it will form a smaller sphere and have less surface to be slowed by resistance to motion through a fluid.

On the other hand suppose that the objects are identical in shape including size by an appropriate inclusion of open space inside the iron sphere. In addition the surfaces of the iron sphere has been roughed up to match the tecture of the cotton sphere. In this case the resistance to motion will be identical as well as the force of gravity being identical. In this case the two objects will reach the ground at the same time.

Now suppose the two objects are not the same shape and suppose the iron object has the shape of a glider. The glider could stay aloft a long time after a cotton ball hits the ground.

Answer 3

In theory, they will both hit the ground at the same time, but this is disregarding wind resistance. The iron will reach the ground faster, but this is because of the iron's ability to overcome wind resistance. I KG of cotton will have such a large volume and surface area that wind will play a large part in its decent to earth, whereas iron is a lot more dense and will pierce through gusts of air a lot easier.

Answer 4

If the cotton is fluffy, it exposes a large surface area and the air resistance and the buoyancy affect it's rate of descent. But if the cotton is compressed into a compact bale, it will go as fast as the iron. If you repeat the experiment on moon, both will hit the ground at the same time since moon has no atmosphere and the buoyancy, friction etc. don't come into effect.

Answer 5

Depends on where the building is. If its on the moon it will be a dead heat.

Then if it is on Earth then it depends the on air resistance which depends on the shape so lets assume we pack each one in a tight ball.

Due to the lower density of cotton it will be a much bigger package than the iron. This means the air friction is greater and it will take longer to fall.

However if you make the iron into a very big glider with a very thin skin then it will stay up longer than the cotton.

Answer 6

Iron and cotton both will reach the ground at the same time

Answer 7

Of course 1Kg iron reach first to ground as the surface area of iron is very less com-pair to cotton, therefore force will be less in case of iron while cotton its surface is higher than iron so it will reach after iron .Atmospheric pressure resist to large surface area to fall into the earth.

Answer 8

If the building is in vaccum then both will reach the ground at same time otherwise which one will reach first depends on its shape which will effect the air resistance.

Answer 9

Both will reach the ground "at the same instant" and "even if their masses were different".

Assumptions:
1. Both were dropped from the same height
2. with same initial velocity (zero or nonzero)
3.neglecting aerodynamic considerations, otherwise we know how leaf falls. Cotton 'fragment' will behave in the same way.
(As i said something about masses being not equal)

Answer 10

if you wrap cotton to the iron then both are reaching at same time to the ground.
other wise iron will reach first b'caz the iron density is very high insted of cotton.

Answer 11

IT DEPENDS UPON THE FRICTION BETWEEN THE OBJECT (COTTON OR IRON) AND ITS SURROUNDING ATMOSPHERE/AIR. IF IT IS DROPPED IN VACCUME THERE WILL NOT BE ANY UPWARD DRAG/ FRUCTION, AND HENCE BOTH 1KG. COTTON OR 1KG. IRON WILL TAKE EQUAL TIME TO REACH THE GROUND, OTHEWISE DUE TO LESS VOLUME AND SO DUE TO LESS FRICTION IRON WILL REACH FIRST TO GROUND.