تجربة ارخميدس
To read the English version click here.
توضح هذه التجربة أنه عند وضع جسم ما في سائل، يزيح الجسم كمية من السائل تساوي كتلتها كتلة الجسم نفسه. علاوة على ذلك، فإن حجم السائل المُزاح يساوي حجم الجزء المغمور من الجسم.
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Newton’s third law
In this video, Jackie chan and his partner found themselves in trouble facing a huge truck while each hanging from a rope. But Jackie was so clever that he found a way to rescue himself and his partner by pushing his partner (action), and as a result, he was pushed back by his partner (reaction). This way both Jackie and his partner were saved.
Verifying Newton’s second law
This experiment was performed in a space shuttle where the gravity is almost zero, so the balls were not affected by any force other than the blow of the astronaut. Note that with the same blow (same force) on each ball, the lighter ball accelerates the most, while the heavier one accelerates the least, which complies with Newton’s second law.
القصور الذاتي
هل لاحظت أن جسمك يميل للأمام عندما تكبح السيارة؟ أو أنه يميل جسمك للخلف عندما تقلع السيارة؟ ذلك لأنك تعاني من خاصية في جسمك تسمى “القصور الذاتي”. كلما زادت كتلة جسمك، كلما ازداد ذلك التأثير.
Newton’s second law
Newton’s second law states that the net force on a body and the acceleration it gains are directly proportional. The constant of proportionality is the mass of the object.
In this experiment, the weight of the anvil is supported by the air pressure underneath it, but even though, its huge mass requires huge force to make accelerate (starts from rest to a certain speed).
Archimedes’ experiment
This experiment shows that, when placed in a liquid, the object displaces a quantity of liquid of mass that is equal to the mass of the object itself. Moreover, the volume of the displaced liquid is equal to the volume of the immersed part of the object.