اسئلة و اجوبة على الوحدة الاولى - الصفحة 2

nannyr · #16 11-06-2012, 09:55 AM

ربى يزيد من حسناتك مشككككككككككككورة جدا على مجهودك

nannyr · #17 11-06-2012, 09:56 AM

سئلة و اجوبة على الوحدة الاولى

مشكككككككورة جدا

nannyr · #18 11-06-2012, 09:58 AM

مشككككككورة

nannyr · #19 11-06-2012, 10:17 AM

بارك الله فيك و جعلك عون المساكين

nannyr · #20 11-06-2012, 10:18 AM

بارك الله فيك و جعلك عون المساكين

nannyr · #21 12-06-2012, 08:22 AM

مشكووووورة

nannyr · #22 12-06-2012, 08:24 AM

مشكككككككككورة

nannyr · #23 12-06-2012, 08:27 AM

اقتباس:

المشاركة الأصلية كتبت بواسطة كينزى114

السلام عليكم و رحمة الله و بركاته
دى اسئلة و اجوبة الوحدة الاولى( الاحتكاك)
و للامانة منقول
و اتمنى ان تستفيدوا منها و لا تنسونا با الدعاء
و انشاء الله باقى الوحدات قريبا انشاء الله

question one:

complete the following:
1- the friction force can be observed between ……… and ……… .
bicycle tyre – ground

2- the friction force affects in ……… direction of ……… .
opposite – movement

3- the ……… force exists between two forces.
friction

4- when the cube slides down on the wooden board, the friction force is ……… .
small

5- the friction force between two surfaces made of glass is ……… than friction between glass and metal.
smaller

6- the friction causes ……… for parts of machines.
damage

7- the temperature rises inside machines is due to ……… .
friction

8- friction forces can be decreased by using ……… and ……… .
lubricants – oil

9- technicians use ……… to decrease friction in wheels.
ball bearing

10- the smooth surface of balls in ball bearing makes the friction force ……… .
almost non-exits

question one:
Complete the following:
1- the friction force can be observed between ……… and ……… .
bicycle tyre – ground

2- the friction force affects in ……… direction of ……… .
opposite – movement

3- the ……… force exists between two forces.
friction

4- when the cube slides down on the wooden board, the friction force is ……… .
small

5- the friction force between two surfaces made of glass is ……… than friction between glass and metal.
smaller

6- the friction causes ……… for parts of machines.
damage

7- the temperature rises inside machines is due to ……… .
friction

8- friction forces can be decreased by using ……… and ……… .
lubricants – oil

9- technicians use ……… to decrease friction in wheels.
ball bearing

10- the smooth surface of balls in ball bearing makes the friction force ……… .
almost non-exits

question five:
write two methods to decrease friction force.
1- using lubricants and oil.
2- using ball bearing.

question six:
explain why we need to push bicycle tyres to move.
because there is a friction force between tyres and the ground.

صباح الخير من فضلك فين الوحدة الاولى سايس
حصل خطء منى