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.
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