Fun Page

By Patricia L. Dombrink


Fun with Fives

Go from 5 to 100 by fives (5, 10, 15, 20, etc.) by moving only up, down, left, or right.

5

20

35

40

50

55

60

10

15

30

35

40

65

70

20

20

25

40

55

75

100

30

60

50

45

50

65

90

25

50

55

60

75

100

95

45

60

75

65

70

85

90

50

65

80

85

75

80

95

Blow Hard

To do this experiment, you will need a thread spool, a straight pin, a piece of cardboard, and scissors.

Cut the cardboard so that it is larger around than the end of the spool, then put a pin through the center of it (see illustration). Place the pin inside one end of the spool, and blow through the other end.

Can you blow the cardboard off?

What happened? The air that you blew through the spool’s hole escaped between the end of the spool and the cardboard, causing a low air pressure between the cardboard and the spool. The higher air pressure on the other side of the cardboard pushed it toward the spool.

Could you blow the cardboard off if you blew through the spool towards the floor? If you stop blowing, will it fall? Try it and see! Could you blow a Ping-Pong ball out of a funnel if you held the funnel so that the ball would not fall out? Try it and see!

[illustration] Illustrated by Denise Kirby