KIT IPA merupakan salah satu alat eksperimen yang umum ada di sekolah. pemanfaatan KIT IPA ini terutama di bidnag fisika akan meningkatkan pemahaman siswa mengenai materi yang diajarkan. semoga materi pelatihan yang telah digunakan di MGMP IPA Bantul tengah dan MGMP Muhammadiyah Sleman Timur ini bermanfaat.
PENGENALAN ALAT KIT LISTRIK
PRAKTIKUM PEMBACAAN ALAT UKUR LISTRIK DAN KOMPONEN LISTRIK
Kesulitan umum :
- membaca hasil pengukuran dengan batas ukur yang berbeda-beda
- merangkai rangkaian sesuai gambar
- pembuatan langkah-langkah percobaan yang sulit diikuti oleh siswa
Mohon lembar ini didownload dan diperbanyak untuk pengamatan demonstrasi di fisika sekolah. link File : Apa yang harus dilakukan
Light is a phenomena that discussed in physics. We don’t know whether it has relationship with economic or not. The purpose of this article is to know the relation between light and the economic law.
In economy we knew that we must spend leatest to get the biggest. It call the law of economy. It represented the eficiency in doing anything. This law is very common in economy but it is not in physics. So how can we correlate between physics and economy. Light is one of the answer of this question.
Light is a electromagnetic wave that can travel in vacuum or in some matter such as water, glass, oil etc. Two characteristics of light are light reflected just same like reflection of a ball and light refracted just like throwing ball into the water. Lets discussed it one by one.
Picture 1. reflection of light
First was the reflection of light. According to snellius laws the reflection of light would decribed like picture 1. Light would not travel from A-C-B but will travel A-D-B. Its was because of ACB had longer track to reach B than ADB. This explain that ligh was very efficient. Light will always took shortest track to reach one point to another point. If light not reflected, light would go in straight line because thats the shortest way to go to that point. Not different from that if light reflected it would took shortest ways to to reach that point. Its represented the economic law talking above.
Picture 2. refracted light
Second was refraction. Light would travel with lower speed when passed trough clear matter which had bigger refraction index. On picture 2, Light travel A to B passing trough different matter. in point A had refractive index n and in B had n’. n’ was bigger than n so light will travel faster in n than in ‘. according to that we can imagine that point A was in the air and ponit B was in the water. If there were a drowned man in point B we would run in air (road etc) with longer track first then swim with shorter track. Its very reasonable and effective. Light would go in that way too. The track would be like in picture 2 and we called it refracted. it happened too when you threw ball into the water. The track would be just same like that. This was the economic laws of light, effectivitness in time.
Light would take shortest track and shortest time to travel. This was the nature of light. Long before people find economic law, Allah Swt made this in nature. Allah Swt made this happened and show His greatness. Physics which was nature phenomena and economy which human creation can be related. One of that was in reflection and refraction phenomena.
Monday, 23-02-2015, 1.30 PM