ELECTROSTATIC FORCE

Bab I. Static Electricity
ELECTROSTATIC FORCE
I. Objective:
To investigate electrostatic force
II. Equipment and Materials:

a. Two plastic ruler
b. Two cross section of glass
c. A leaf of drugget
d. A leaf of silky cloth
e. Rope shaped

III. Basic theory:
Atom compiled by smaller particle, so-called particle subatom. three particle subatom important is proton, electron and neutron. neutron and proton there are in nucleon, or center from a atom. electrons are got in an externaldistricts of nucleons, what often considered to be by electron cloud.
Electron and proton measure up to same, known as electric charge. not like other physicist magnitude, electric charge have no allocutions you, deliberate or define. but effect from electric charge earn observable you. analogue electric charge can with wind. wind have no seen but the effect earned observable you and feel.
Magnitude of electron and proton electric charge is same, but type both is unegual. proton electric charge is positive ( marked with key"+"). neutron is neutral, what meaning don't charge electricity. signal + or - don't have meaning of fisis. (Kanginan, Marthen; 2004 : 3)
IV. Procedures :
1. Hang one of ruler with cord causing can make a move Free.
2. Rub one of ruler with drugget for several moment.
3. Ask your friend to do same thing at other ruler.
4. Draw near both nose which newly the rubbed.
5. Repeat pace of 2-4 is finite by using cross section of silky cloth and glass. What your observing at the hung glasses?
6. Rub the suspension plastics ruler with drugget again. Concurrently, rub one of cross section of glass with silky cloth. Draw near both. What your observing at the hung rulers?.

V. Observation Table
Interaction Description Happened
Hung rulers with Ruler Hung glasses with Glasses Hung rulers with Glasses






VI. Question
1. What your observing at the hung rulers which have been rubbed with drugget with ruler which have been rubbed with drugget?
2. What your observing at the hung glasses which have been rubbed with silk with cross section of glass which have been rubbed with silk ?
3. What your observing at the hung rulers which have been rubbed with drugget with cross section of glass which have been rubbed with silk ?
4. Write your conclution!


Refference
Abdullah, mikrajuddin. 2004. IPA FISIKA 3. Jakarta: Erlangga
Abisabrina.wordpress.com/2010/08/13/hukum-ohm-dan-rangkaian-seri-paralel/
Hewitt, Paul G., dkk. 2007. Conceptual Integrated Sccience. San Fransisco: United States
Kanginan, Marthen. 2004. Sains Fisika SMP semester 1. Jakarta: Erlangga
Panitia Sertifikasi Guru. 2010. Ilmu Pengetahuan Alam SMP (Buku 2). Yogyakarta: UNY