Do This

اتفخي بالون واربطيه جيدا حتي لا يتسرب الهواء Inflate and tie a balloon so that it does not leak.
نظفي الزجاج الخارجي للنيون Clean and thoroughly dry the outside of a fluorescent light tube.
قربي البالون من انبوب مصباح النيون في غرفة مضلمة تماما Go into a dark room or closet with the balloon and fluorescent tube.
اخملي انبوب النيون رأسيا بحيث يصبح احد اطرافة موضوع على الارض Place one end of the fluorescent tube on the floor and hold it upright.
اقركي البالون المنفوح صعودا ونزولا على انبوب المصباح Rub the balloon up and down on the outside of the fluorescent tube.
في الخطوة السابقة تكونت شحنات ساكنة على الانبوب , الان قربي فقط البالون من الانبوب Now just hold the balloon near the tube.
ماذا تلاحظين ؟ هل تشاهدين اضاءة للمصباح Did you see any light in the fluorescent tube?
What Should Have Happened
The fluorescent tube starts to glow as the balloon is rubbed on the tube. The light moves with the movement of the balloon. Rubbing the balloon on the tube causes charged particles (electrons) to build up on the surface of the balloon and charges the mercury vapor inside the tube. The charged mercury vapor causes the fluorescent chemicals inside the tube to produce visible light. Electricity would normally create
this chemical process, but the balloon and static electricity do the same thing on a smaller scale
ما هي الفكرة العلمية لهذة التجربة ؟
المشاهدة سوف يضء المصباح هندما نمرر البالون على مصباح النيون وذلك لانه عندما دلكنا البالون بالمصباح اول مرة تكونات شحنات ساكنة على سطح انبوب النيون وهي شحنات سالبة الكترونات فهذة الاكترونات تتحد مع محتويات انبوب النيون التي تحمل الذرات الموجة فينتج من هذا التفاعل اضاءة.

[hide]

Flying Needle

Magnets




Things You Will Need
Bar magnet
Steel straight pin
Thread
Tissue paper
Scissors




Do This


Cut a 1-inch by 1/2-inch oval from tissue paper.
Insert a steel straight pin through the center of the shorter side of the tissue oval. This should form a miniature "airplane.
Tie a 12-inch piece of sewing thread to the head of the pin.
Place a bar magnet on the edge of a table or counter with the end of the magnet extended over the edge of the table.
Place the pin of the paper airplane on the end of the magnet and slowly pull on the thread until the airplane is suspended in the air.


What Should Have Happened
The tissue paper airplane stays suspended as long as it is close to the magnet. The airplane is able to overcome the downward pull of gravity if the force between the magnet and the pin is stronger. This force is only for a very small distance between the magnet and the pin.
[/hide]

[hide]
Magnet Strength

Magnets




Things You Will Need
Several different sizes of bar magnets
Box of small paper clips
Masking tape





Do This
Tape a magnet to the edge of a table or counter with part of the magnet extending over the edge.
Bend open one end of a paper clip.
Touch the bent paper clip to the bottom of the magnet that extends over the table's edge so that the paper clip forms a hook.
One at a time, add paper clips to the paper clip "hook" until the clips pull loose and fall from the magnet.
Repeat this experiment using different sizes of magnets.
What Should Have Happened
The number of paper clips that can be added before they fall varies with different strengths of magnets. Smaller, weaker magnets will not hold as many paper clips as larger, stronger magnets. Magnetic materials contain clusters of atoms called magnetic domains. The magnetic domains inside a magnet line up when the paper clips are held near the magnet. The strength of a magnet increases as the number of domains pointing in the same direction increases.
[/hide]