Are you interested in some fun science experiments？Here is a small experiment of a parachute （降落傘）.
| ●Question：What influences the speed of the parachute during the dropping？●Hypothesis （假設(shè)）：The speed has to do with the size of the parachute's surface area. ●The unchanged：the length of the string；the weight of the object；the height of the dropping；the place （indoors）. ●The changed：the size of the parachute's surface area. |
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| What we record | Dropping times | Surface area | Time |
| 1st time | 0.5 m2 | 3.67 s | |
| 2nd time | 1 m2 | 5.82 s | |
| 3rd time | 1.5 m2 | 6.51 s | |
C
C
，pieces of sing and an object in this experiment.A．a(chǎn) cloth bag
B．a(chǎn) paper bag
C．a(chǎn) plastic bag
（2）How many things are unchanged in the experiment？
B
B
A．3.
B．4.
C．5.
（3）What probably influences the speed of the parachute during the dropping？
C
C
A．The length of the parachute's string.
B．The weight of the parachute's object.
C．The size of the parachute's surface area.
（4）Which subject is the experiment mainly connected with？
B
B
A．
B．
C．
【答案】C；B；C；B
【解答】
【點(diǎn)評】
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發(fā)布：2024/4/20 14:35:0組卷：2引用：3難度：0.7
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