Step 1 Look and choose（基础性作业）
同学们来到第二站“简单机械互动区”，体验古代劳动工具，请你观察图片，做出正确的选择。

1. When a man uses a well sweep（桔槔）to get water, he uses a ()
A. lever B. ramp C. wheel

2. When a man turns a windlass（辘轳）to get water, he uses a ()
A. lever B. ramp C. wheel

1. A 2. C

Step 2 Read and write（拓展性作业）
在互动区，同学们操作了斜面移物实验。请观察实验结果，完成实验报告。
Experiment: Moving the same box on different ramps
Rules: Use the same box. Start at the top. Do not push or pull the box.

Word bank
quickly slowly fast early
The box moves more slowly on the lower ramp than on the higher ramp.
1. The box moves on the highest ramp than on the higher ramp.
2. Of the three ramps, the box moves on the lower ramp.
3. Of the three ramps, the box goes on the highest ramp. It gets to the bottom（底部）.

1. faster / more quickly 2. the most slowly 3. the fastest / the most quickly, the earliest