مشاهدة النسخة كاملة : اسئلة و اجوبة على الوحدة الاولى
كينزى114 18-02-2010, 04:46 PM 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.
كينزى114 18-02-2010, 04:47 PM Question one:
Complete the following:
1- Friction forces can be observed in ……… , ……… and ……… .
solids – liquids – air
2- The friction forces can be observed in air only when the objects move ……… .
so fast
3- Air crafts, rockets and trains are having ……… shape to overcome ……… force.
Streamline – friction
4- The friction in air is known as ……… while friction in water is known as ………
air resistance – water resistance
5- There is a ……… relation between friction and ……… of a moving object.
direct – surface
6- The car is said to be moving by constant velocity when ……… force equals ……… force.
motion – friction
7- The friction force affects in ……… direction of movement.
opposite
8- As the body moves fast in water, its resistance ……… .
increases
9- The fish has ……… shape to decrease ……… .
streamline – friction
10- Friction prevents people from ……… during walking.
slipping down
11- Lightening of a match depends on ……… force.
friction
12- By friction force cars can move ……… .
forward
13- The car tyres contain ……… to increase friction.
grooves
Question two:
Write three advantages of friction.
1- Car can move forward.
2- People can walk.
3- Lightening of a match.
Question three:
Give reasons for:
1- Rockets and aircrafts have streamlined shape.
To decrease friction force with air.
2- The fish has streamline shape.
To decrease friction force with water.
3- People can walk on the ground.
Due to the presence of friction force.
4- Fast boats are designed in small surface.
To decrease friction force with water.
5- Friction can be observed only in fast objects in air.
Because air has small mass.
Question four:
Comparison:
Compare between air resistance and water resistance.
Air resistance
Water resistance
Amount of resistance is due to friction through air
Observed by fast objects
Amount of friction force on moving through water
Observed by moving objects
Question five:
"Friction is one of the basic forces". Explain.
Because it is used in many objects to move and change speed or direction.
samora_2010 19-02-2010, 05:47 AM اسئله رائعه بجد
وجزاكى الله عنا خيرا
:av4056bb7jp3:شكرا لكى:av4056bb7jp3:
menakaram80@yahoo.com 01-03-2010, 01:18 AM بارك الله فيك و جعلك عون المساكين
hamam55555 14-03-2010, 02:10 AM جزاكم الله خيرا
مستر عبدالرحمن المغربى 14-03-2010, 11:34 AM جزاكم الله كل الخير وجعله الله فى ميزان حسناتك
ابوجنا2 01-10-2010, 08:44 PM thanksssssssssssssssssssssssssssssssssssss
khaaled2 29-10-2010, 04:00 PM جزاكم الله كل الخير وجعله الله فى ميزان حسناتك با رب اسطوانات للتعليم التجارى وشكراااااااااااا
عماد يونان بسطوروس 19-12-2010, 12:50 AM شكرا على المجهود
nannyr 27-05-2012, 11:13 AM نشكركم على مجهودتكم وربى يزيد من حسناتكم
nannyr 27-05-2012, 11:14 AM اسئلة و اجوبة على الوحدة الاولى
نشكركم على مجهودكم
nannyr 27-05-2012, 11:16 AM اسئلة و اجوبة على الوحدة الاولى
نشكركم
nannyr 05-06-2012, 09:33 AM اسئلة و اجوبة على الوحدة الاولى
نشكركم
nannyr 05-06-2012, 09:34 AM نشكركم على مجودكم
nannyr 11-06-2012, 09:52 AM مشكووووووووورة
nannyr 11-06-2012, 09:55 AM ربى يزيد من حسناتك مشككككككككككككورة جدا على مجهودك
nannyr 11-06-2012, 09:56 AM :av4056bb7jp3:سئلة و اجوبة على الوحدة الاولى
مشكككككككورة جدا
nannyr 11-06-2012, 09:58 AM مشككككككورة
nannyr 11-06-2012, 10:17 AM بارك الله فيك و جعلك عون المساكين
nannyr 11-06-2012, 10:18 AM بارك الله فيك و جعلك عون المساكين
nannyr 12-06-2012, 08:22 AM مشكووووورة
nannyr 12-06-2012, 08:24 AM مشكككككككككورة
nannyr 12-06-2012, 08:27 AM 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
nannyr 16-06-2012, 06:58 AM بارك الله فيك و جعلك عون المساكين
nannyr 21-06-2012, 07:19 AM جزاكم الله خيرا
nannyr 21-06-2012, 07:20 AM جزاكم الله خيرا
nannyr 30-06-2012, 07:20 AM بارك الله فيكى مشكورةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةةة
nannyr 10-07-2012, 07:25 AM اسئله رائعه بجد
وجزاكى الله عنا خيرا
:av4056bb7jp3:شكرا لكى:av4056bb7jp3:
مشكووووووووووووووووووووووووووووووووووورة
nannyr 10-07-2012, 07:26 AM مشكوووووووووووووووووووووووووووووووورة
nannyr 22-08-2012, 01:10 PM مشكككككككككككككككككورررررررررررررررررة
nannyr 23-08-2012, 12:48 PM question one:
complete the following:
1- friction forces can be observed in ……… , ……… and ……… .
solids – liquids – air
2- the friction forces can be observed in air only when the objects move ……… .
so fast
3- air crafts, rockets and trains are having ……… shape to overcome ……… force.
streamline – friction
4- the friction in air is known as ……… while friction in water is known as ………
air resistance – water resistance
5- there is a ……… relation between friction and ……… of a moving object.
direct – surface
6- the car is said to be moving by constant velocity when ……… force equals ……… force.
motion – friction
7- the friction force affects in ……… direction of movement.
opposite
8- as the body moves fast in water, its resistance ……… .
increases
9- the fish has ……… shape to decrease ……… .
streamline – friction
10- friction prevents people from ……… during walking.
slipping down
11- lightening of a match depends on ……… force.
friction
12- by friction force cars can move ……… .
forward
13- the car tyres contain ……… to increase friction.
grooves
question two:
write three advantages of friction.
1- car can move forward.
2- people can walk.
3- lightening of a match.
question three:
give reasons for:
1- rockets and aircrafts have streamlined shape.
to decrease friction force with air.
2- the fish has streamline shape.
to decrease friction force with water.
3- people can walk on the ground.
due to the presence of friction force.
4- fast boats are designed in small surface.
to decrease friction force with water.
5- friction can be observed only in fast objects in air.
because air has small mass.
question four:
comparison:
compare between air resistance and water resistance.
air resistance
water resistance
amount of resistance is due to friction through air
observed by fast objects
amount of friction force on moving through water
observed by moving objects
question five:
"friction is one of the basic forces". Explain.
because it is used in many objects to move and change speed or direction.
ربى يخليكى مشككككككككككككككككككككورة جدا
nannyr 23-08-2012, 12:55 PM مشكككككككككككككككككككككككورة
nannyr 23-08-2012, 12:57 PM عاوزة احمل الساينس
مسترسمير إبراهيم 28-08-2012, 01:23 AM مشكككككككككككككور
MR/Ahmad Zayed 26-10-2012, 12:24 AM جزاكم الله كل خير
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