Mighty Machines

Mighty Machines pdf epub mobi txt 电子书 下载 2025

出版者:Sterling Pub Co Inc
作者:Levine, Shar/ Johnstone, Leslie/ Harpster, Steve (ILT)
出品人:
页数:48
译者:
出版时间:2007-3
价格:$ 5.59
装帧:Pap
isbn号码:9781402740510
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How do machines work? Kids will have a blast constructing a mini-seesaw to illustrate the way a lever operates or creating their very own pulley from an empty spool, string, ribbon, pails, pennies, a broom, and two chairs. They'll find out why they can't put in a screw using only their fingers and examine the different parts of compound machines. In another experiment, a child's bicycle becomes a laboratory for understanding whether wheels have to be smooth to run. A good time will be had by all.

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