امتحان

The arm of fo r ce is the distance between...

1

Effo r t fo r ce a nd fulcrum

2

Resistance a nd fulcrum

3

Both A a nd B

تصحيح

The first class lever differs that of the second class lever in -------

1

The position of the fulcrum

2

The absence of the acted fo r ce

3

The presence of fixed point to rest on.

تصحيح

Fishing tool a nd tweezers are considered as-------class levers.

1

Third

2

First

3

Second

تصحيح

--------- Always saves effo r t.

1

Third class lever

2

Second class lever

3

First class lever

تصحيح

The --------- class levers are very impo r tant in our life although they don’t conserve effo r t

1

Second class levers

2

Third class levers

3

First class levers

تصحيح

The type of levers which always has a mechanical benefit is ---------.

1

First class levers

2

Second class levers

3

Third class levers

تصحيح

Fo r ce x ------- = Resistance x its arm

1

Arm of resistance

2

Resistance fo r ce

3

Its arm

تصحيح

Tweezers are used to ---------

1

Hold the cold materials

2

Pick up very small objects

3

Increase the speed of the ball

تصحيح

When the effect fo r ce equal to 2 a nd the fo r ce equal the arm equal cm, The resistance fo r ce equal to 9 What is the resistance arm equal?

1

5 cm

2

3 cm

3

10 cm

تصحيح

The distance between the effo r t fo r ce a nd fulcrum

1

Effo r t fo r ce arm

2

Levers

3

Resistance fo r ce

تصحيح

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