اسئلة و اجوبة على الوحدة الاولى

[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.

[كينزى114]

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]

اسئله رائعه بجد

وجزاكى الله عنا خيرا

شكرا لكى

بارك الله فيك و جعلك عون المساكين

[hamam55555]

جزاكم الله خيرا

[مستر عبدالرحمن المغربى]

جزاكم الله كل الخير وجعله الله فى ميزان حسناتك

[ابوجنا2]

thanksssssssssssssssssssssssssssssssssssss

[khaaled2]

جزاكم الله كل الخير وجعله الله فى ميزان حسناتك با رب اسطوانات للتعليم التجارى وشكراااااااااااا

[عماد يونان بسطوروس]

شكرا على المجهود

[nannyr]

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اسئلة و اجوبة على الوحدة الاولى
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