Two large sheets of aluminium foil identical in size and shape are taken.One sheet is crumbled into a tight ball and other sheet is kept as such.Now both the ball and sheet of foil are allowed to fall through air from same height and at the same time.
a) Which piece of foil falls with greater speed and why?
b) What force comes into play when an object moves through air and on what factor does it depend?
c) Why are the objects/bodies moving through fluids given special shapes?
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if you consider AIR then the foil with the least drag will fall first and with the highest velocity but if you want to see it from a book neglecting the air then both of them will going to fall at the same time. forces which comes into play when an objects move through the air is basically the the air itself which is opposing it for any particle moving through it assume them to be a small bodyguards that are blocking your way as you move through them.
in the last part about the question that why fluids a given special shapes this is basically done to reduce the drag because more blunt shapes causes more drag and the sharper the object less will be the drag and hence more will be the velocitY
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