乐乐课堂小小科学家

01.声音由振动产生.mp4 [5.90MB]

02.声音在介质中的传播.mp4 [2.61MB]

03.探究可传声的介质.mp4 [5.84MB]

04.影响响度的因素.mp4 [8.31MB]

05.影响音调的因素.mp4 [3.45MB]

06.探究音调与琴弦的关系.mp4 [10.09MB]

07.神奇的水瓶.mp4 [8.62MB]

08.热胀冷缩.mp4 [8.15MB]

09.探究水沸腾.mp4 [5.53MB]

10.影响沸点的因素.mp4 [4.59MB]

11.纸杯烧水.mp4 [4.16MB]

12.影响蒸发快慢的因素.mp4 [6.08MB]

13.水杯上的小水珠.mp4 [8.14MB]

14.光沿直线传播.mp4 [5.05MB]

15.探究光反射时的定律.mp4 [6.25MB]

16.探究平面镜成像的规律.mp4 [6.89MB]

17.光的折射.mp4 [8.17MB]

18.透镜的作用（会聚,发散）.mp4 [3.86MB]

19.探究凸透镜成像的规律.mp4 [11.44MB]

20.力的作用效果.mp4 [6.59MB]

21.物体间力的作用是相互的.mp4 [4.57MB]

22.探究影响压力作用效果的因素.mp4 [3.83MB]

23.探究滑动摩擦力的影响因素.mp4 [6.54MB]

24.连通器.mp4 [4.79MB]

25.流体压强与流速的关系.mp4 [5.60MB]

26.探究浮力大小的影响因素.mp4 [5.28MB]

27.汤勺变磁铁.mp4 [6.93MB]

28.影响电磁铁磁性强弱的因素.mp4 [9.67MB]

29.磁场对通电导线的力的作用.mp4 [6.49MB]

30.摩擦起电.mp4 [6.81MB]

31.对蜡烛及其燃烧的探究.mp4 [6.57MB]

32.对人体吸入的空气和呼出的气体的探究.mp4 [6.53MB]

33.铁与氧气的反应.mp4 [3.79MB]

34.明矾净水.mp4 [3.96MB]

35.软水和硬水的鉴别.mp4 [3.50MB]

36.自制简易净水器.mp4 [6.47MB]

37.制取炭黑.mp4 [3.08MB]

38.鸡蛋壳和醋精的反应.mp4 [3.11MB]

39.淬火和回火.mp4 [4.10MB]

40.铁生锈条件的探究实验.mp4 [3.06MB]

41.乳化现象.mp4 [6.30MB]

42.自制白糖晶体.mp4 [5.97MB]

43.自制汽水.mp4 [4.69MB]

44.制作叶脉书签.mp4 [9.34MB]

45.粗盐提纯.mp4 [8.08MB]