PhysicsBhanu · Class 4-5
Parachute dheere kyun utarta hai?
Ek kaagaz ko seedha chhodo aur ek kaagaz ki goli banakar chhodo — kaun pehle zameen pe pahunchega?
Socho pehle… phir dekho jawab
Goli pehle girti hai! Dono ka wazan same hai, par khula kaagaz bahut saari hawa ko dhakelta hai. Hawa bhi ulta dhakka deti hai, isliye woh dheere girta hai.
Hawa dikhti nahi, par woh jagah gherti hai aur dhakka deti hai. Jab koi cheez girti hai, toh use raaste ki hawa hatani padti hai. Isse jo rukawat hoti hai, use hawa ka rukawat bal (air resistance) kehte hain. Yeh hamesha girne ki ulti disha mein lagta hai.
Cause aur effect dekho: jitna bada failaav, utni zyada hawa se takkar, utni dheemi girawat. Isliye parachute ek bada chhata jaisa khulta hai. Cheez wahi hai, bas shape badli — aur speed kam ho gayi.
Cycle chalate waqt chehre pe hawa lagti hai na? Woh bhi yahi rukawat hai. Tez bhaagne wali car aur race cycle ki shape patli aur chikni rakhi jaati hai, taaki hawa kam roke.
Ghar pe try karo
Ek purani polythene ya rumaal ke chaaron kono pe dhaaga baandho aur neeche ek chhota plastic khilona baandh do. Kisi grown-up ke saath kursi pe khade bina, bas haath upar karke chhodo. Phir bina parachute ke khilona chhodo. Kaun dheere utra?
Wow!
Gaganyaan ka crew module bhi samundar mein dheere utarne ke liye kai parachute kholega — pehle chhote, phir bade!
Mummy-Papa ke liye
Aaj ek rumaal aur dhaage se parachute banaiye aur bachche se poochhiye ki woh dheere kyun gira.
3 sawaal
- Khula kaagaz goli wale kaagaz se dheere kyun girta hai?
Jawab dekho
Woh zyada hawa se takraata hai. Khula kaagaz zyada failaa hota hai, isliye zyada hawa ko hataata hai aur hawa use zyada rokti hai.
- Parachute ka kaam kya hai?
Jawab dekho
Girne ki speed kam karna. Bada khula parachute hawa ki rukawat badhaata hai, jisse cheez dheere utarti hai.
- Race cycle chalane wale jhuk kar kyun chalate hain?
Jawab dekho
Taaki hawa kam roke. Jhukne se saamne ka failaav kam hota hai, toh hawa ki rukawat kam aur speed zyada.
NCERT se jodo: NCERT Class 5 EVS (Looking Around) — hawa aur hamara aas-paas