CU 4.16Levers

1. 1

   Try to lift the heavy book with one finger under its edge. 'That is hard.'

2. 2

   Set the board on the block with the book on one end. Press down on the other end: 'The book went up easily. This is a lever.'

3. 3

   Point to the block: 'The lever rests here. This point is called the fulcrum.'

4. 4

   Move the fulcrum close to the book and press. Then move it far from the book and press. Ask which was easier.

5. 5

   Invite the child to try both positions and find the easiest place.

6. 6

   Match the picture cards of everyday levers and find the fulcrum on each.

What catches the child’s eye

• A heavy book rising with one finger pressing the far end
• The same push lifting easily or barely at all as the fulcrum slides

Extensions, easiest to hardest

1. Balance two equal loads on the lever, then two unequal loads
2. Use a spoon handle to pry the lid off a tin, with the guide
3. Sit on a playground seesaw with a friend and move closer to the middle
4. Find levers in the practical life area: tongs, scissors