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Why will a sheet of paper fall slower than one that is crumpled into a ball?
 
When a sheet of paper is crumbled into a ball, then its surface area becomes
 than the surface area of a plain non-crumpled sheet of paper.
 
Hence, the 
exerted by air on the sheet is
 than the force exerted on the ball.
 
Hence the sheet falls slower as compared to a paper ball.
Answer variants:
much lesser
upward force
greater
downward force