فيزياء: أي استفسار أول سؤال

[No0o0oN]

جزاك الله خير بس هنا عندي سؤال
24. Equal forces F�� act on isolated bodies A and B. The mass of B is three times that of A. The
magnitude of the acceleration of A is:
A. three times that of B
B. 1/3 that of B
C. the same as B
D. nine times that of B
E. 1/9 that of B ans: A

ليش الجواب a

وكمان عندي سؤال احنا لمن نحلل القوه هل ناخذ القوه اللي في اتجاه تسارع الجسم موجب
والعكس سالبه .
ام اللي على اتجاه السيني السالب سالبه واللي على اتجاه السيني الموجب موجبه .
55. A 5-kg concrete block is lowered with a downward acceleration of 2.8m/s2 by means of a rope.
The force of the block on the rope is:
A. 14 N, up
B. 14 N, down
C. 35 N, up
D. 35 N, down
E. 49 N, up
وهنا ليش الجواب d


وهذا السؤال ماني فاهمته :
A sled is on an icy (frictionless) slope that is 30◦ above the horizontal. When a 40-N forc,
parallel to the incline and directed up the incline, is applied to the sled, the acceleration of the
sled is 2.0m/s2, down the incline. The mass of the sled is:
A. 3.8kg
B. 4.1kg
C. 5.8kg
D. 6.2kg
E. 10 kg
ans: E