Ek-samaan aur Asamaan Gati
Class 7 Science · Chapter 8: Samay aur Gati ka Maapan · NCERT Curiosity section 8.4
Seekho
Neel do station ke beech seedhi patri par train dekhta. Wo dheere shuru hoti, tez hoti, kuch der sthir chalti, phir dheemi hokar rukti. Seedhi rekha mein gati rekhik gati. Sthir chaal par train ek-samaan rekhik gati mein; tez ya dheemi hote samay asamaan rekhik gati mein.
Do train, har 10 minute note ki gayi. Train P: 0, 20, 40, 60, 80 km; har 10 minute mein 20 km: ek-samaan. Train Q: 0, 20, 35, 60, 80 km; 20, 15, 25, 20 km: barabar samay mein asamaan doori, to asamaan. Lambi doori par sach mein ek-samaan gati durlabh, isliye hum ausat chaal use karte.
Explore: ek-samaan ya asamaan?
- Har gati sort karo.
Yaad rakho
- Ek-samaan rekhik gati: seedhi rekha mein barabar samay mein barabar doori.
- Asamaan gati: barabar samay mein asamaan doori; zyaadatar asli gati asamaan.
Quick check
Car pehle ghante 60 km, doosre 70 km, teesre 50 km. Ausat chaal?
- 60 km/h
- 70 km/h
- 180 km/h
- 50 km/h
Answer
60 km/h. Kul 180 km ÷ 3 h = 60 km/h; gati asamaan.
Socho
Seedhi sadak par bhi shehar ke traffic mein car ki gati asamaan kyun?
Ek answer
Signal, chauraahe aur doosri gaadiyon ke liye baar-baar dheemi-tez hoti, to barabar samay mein asamaan doori.
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.