"Small mechanical power" picture book story
File Size: 1.28MB Download times: 766
"Small mechanical power" picture book story
Lever, bevel, pulley, axle, spiral and split, are six basic simple mechanical tools. What can they do?
These trees, how to push all push down, how do?
You can use the ax to hack it!
The wood is big and heavy, how to push all push, how to do it?
You can use the lever to promote Oh!
Good wood Oh! How can I move?
Use the slope to carry, to save more effort!
Holding the wood to go, so tired Oh! How to do it?
You can use the wheel of the car to help Oh!
The tree is too high, the wood is not shipped up, how do?
You can use the pulley to transport ah!
Climb up, climb down, good trouble Oh! How to do it?
Use helix to more convenient!
