Hold a long thin paper with your lower lip on one end of the paper like this and blow hard just above the paper as shown in the figure.  What will happen?

Switch off the fan in a room and hold a paper up vertically as shown.  What happens?  Nothing!  The paper just hangs stationary.  But if the atoms keep pushing the paper like it is shown here, shouldn’t the paper fly up?  Why doesn’t it?Air has low density and so it doesn’t exert much pressure on the paper to make it fly up.The pressure exerted by the paper atoms is more than the pressure exerted by the air atoms.Atoms on the other side of the paper also push equally and so force cancels out.Air atoms are tiny and have very little mass. So even when they hit the paper the force is very low.

How does blowing inside the bottle make the paper ball come out?the air pressure inside the bottle is same as that at its mouththe air pressure inside the bottle is more than the pressure at its mouth.the air pressure inside the bottle is less than that at its mouth.the pressure is same in the bottle and outside it.

Why will a sheet of paper fall slower than one that is crumpled into a ball?

If a crumpled piece of notebook paper and a flat sheet of notebook paper are dropped at the same time from the same height, why does the crumpled piece of paper land first?A The crumpled paper has more gravitational force exerted on it.B The flat paper has more air resistance.C The flat paper has more mass.D The crumpled paper has less mass.

Take a straw and cut it into two.  Dip the first straw into a glass of water and keep the second straw on top of the first straw as shown in the figure and then blow hard.  Water rises in the first straw.  Why?