EngineeringBhanu · Class 4-5
Kaagaz ka pul, sikkon ka bojh
Ek seedha kaagaz do kitaabon ke beech rakho — ek sikka bhi nahi sambhalta. Kya kaagaz ko taakatwar bana sakte hain bina kuch jode?
Socho pehle… phir dekho jawab
Haan! Kaagaz ko pankhe jaisa mod do (zig-zag). Wahi kaagaz ab kai sikke utha lega. Taakat material se hi nahi, shape se bhi aati hai.
Seedha kaagaz patla hai, toh bojh aate hi beech se jhuk jaata hai. Jab tum use zig-zag modte ho, har mod ek chhoti deewar jaisa khada ho jaata hai. Cause-effect: khadi deewarein jhukne nahi deti, toh pul mazboot ho jaata hai.
Engineers yahi trick lagate hain. Gatte ke dabbe ke andar lehardaar (corrugated) parat hoti hai. Tin ki chhat bhi lehardaar hoti hai. Kam material, zyada taakat — yahi achhi engineering hai. Isse cheezein halki bhi rehti hain aur sasti bhi.
Doosri badi trick hai triangle. Triangle ko dabao toh woh shape nahi badalta, jabki chaukor tedha ho jaata hai. Isliye bijli ke tower, railway pul aur crane mein bahut saare triangle dikhte hain.
Ghar pe try karo
Do kitaabon ke beech 10 cm gap rakho. Pehle seedha kaagaz rakh kar ek-ek sikka rakho. Phir wahi size ka kaagaz zig-zag mod kar pul banao aur sikke gino. Kitne guna zyada utha paaya?
Wow!
Bijli ke bade tower upar se neeche tak triangle hi triangle se bane hote hain!
Mummy-Papa ke liye
Aaj do kitaab, ek kaagaz aur kuch sikkon se pul banaiye aur milkar gino kitne sikke tike.
3 sawaal
- Zig-zag moda kaagaz zyada bojh kyun uthata hai?
Jawab dekho
Uski shape jhukne nahi deti. Mod chhoti khadi deewaron jaise kaam karte hain, jo jhukne se rokte hain.
- Bijli ke tower mein kaunsi shape sabse zyada dikhti hai?
Jawab dekho
Triangle. Triangle dabane pe bhi shape nahi badalta, isliye structure mazboot rehta hai.
- Gatte ke dabbe ki lehardaar parat ka fayda?
Jawab dekho
Kam material mein zyada taakat. Lehar wali parat dabba halka rakhte hue bhi mazboot banati hai.
NCERT se jodo: NCERT Class 5 EVS — ghar aur imaaratein kaise banti hain