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?
Answer: A.B.C.D
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Answer:
a. crumbled tight ball
b. depends on the shape of the object
c. objects moving in fluids face the friction of the fluid that opposes their motion
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