CU 4.14Introduction to Simple Machines

1. 1

   Lift the weighted box straight up. Say: 'That was hard work for my arms.'

2. 2

   Set the board on blocks and push the box up it: 'This ramp makes the job easier. A ramp is a simple machine.'

3. 3

   Set the ruler over the block, put a small object on one end, and press the other end down: 'This is a lever.'

4. 4

   Put the box in the wagon and pull it, then drag the box on the floor: 'Wheels turning on an axle make pulling easier.'

5. 5

   Pull the pulley string down and watch the bucket go up: 'This is a pulley.'

6. 6

   Line up the four machines and give a three-period lesson on their names.

7. 7

   Match the picture cards of everyday machines to each simple machine.

8. 8

   Tell the child that each machine has its own work on the shelf to explore next.

What catches the child’s eye

• The heavy box gliding up the ramp with an easy push after being so hard to lift
• A slide, a seesaw, and a flagpole the child already knows turning out to be machines

Extensions, easiest to hardest

1. Find simple machines on the playground
2. Sort a larger set of everyday machine pictures
3. Go on to the ramp, lever, wheel and axle, and pulley works