Magnets can do strange things---that's what makes them such fun to play with. They can stick to each other. They can make nails or pins hang on to each other, like people holding hands. They can even...
A machine that never stops?
For twenty-seven years Dr. Coatsworthy Mothbold has been building an automatic polka-dotting machine. It can paint polka dots on anything---walls and windows, shirts and socks, even pretzels and...
Friction from air
Even air creates friction---it rubs against moving things and slows them down. You can make a \"helicopter" that uses the friction of air to slow its fall---and to spin, too. Place the paper with...
How do brakes work?
> This bicycle has hand brakes---one for the front wheel and one for the > rear wheel. To stop, the rider squeezes the levers on the handle bars. Slow down! There's a busy street ahead. Stop your...
The invisible push
The light turns green and the car starts to move quickly. It feels as if a big, invisible hand pushes you back in the car seat and makes you stay there. But it feels different when the car stops...
Pushes and pulls
Back and forth, up and down. Swinging in a swing is almost like flying. What makes the swing go up in the air? Most of the time you do. You \"pump" with your legs and body. Sometimes you can get a...
Let’s Get Moving
Let’s Get Moving Let’s Get Moving
How Things Work
Here are explanations and experiments concerning forces and machines; sound, light, heat, motion, and electricity; the six simple machines; and such everyday machines as clocks, cam¬eras, and engines.
Books to Read
If you enjoyed making the crafts and doing the activities in this book, you'll find lots of other good arts and crafts books. Some of them are listed here. Your school or public library will have...
The party-planner’s check list
Here's a check list that will help you have a successful party. It tells you what to do and when to do it. Before the Party Two Weeks Before ask your parents for permission to have a party ...