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

Take a sheet of paper . Fold it as shown in the figure Count the number of par and the area of a part in each case. Tabulate your observations and discuss with your friends . Is it a case of invers proportion ? Why ?

Classify the objects or materials given below as opaque,transparent or translucent and luminous or non-luminous. Air, water, a piece of rock, a sheet of aluminium, a mirror , a wooden board, a sheet of polythene,a CD ,smoke , a sheet of plane glass, fog, a piece of red hot iron, an umbrella, lighted fluorescent tube , a wall ,a sheet of carbon paper , the flame of a gas burner, a sheet of cardboard, a lighted torch , a sheet of cellophane, a wire mesh, kerosene stove ,sun, firefly, moon.

Take a sheet of paper. Fold it as shown in the figure. Count the number of parts and the area of a part in each case. Tabulate your observations and discuss with your friends. It it a case of invers proportion ? Why ?

One corner of a long rectangular sheet of paper of width 1 unit is folded over so as to reach the opposite edge of the sheet. Find the minimum length of the crease.

Why does the paper strip open up when touched with a charged rod?