Science Projects And Inventions

YOU NEED

• • A book
  • A piece of wooden board
  • Four pencils

Place a book on a sloping wooden surface and push it, you will find that it moves slowly. Now place four pencils under the book, you will find it moves more easily and smoothly.

HOW DOES IT WORK?

The wooden surface provides resistance to motion and slows the movement of the book. Placing four pencils under the book reduces friction and the book moves easily.