Links:
[1] http://www.mada.org.il/ar/education/concepts/electricity/voltage
[2] http://www.mada.org.il/ar/education/concepts/electricity/charge
[3] http://www.mada.org.il/ar/education/concepts/electricity/touchcharge
[4] http://www.mada.org.il/ar/education/concepts/electricity/force
[5] http://www.mada.org.il/ar/education/concepts/electricity/conservation
[6] http://www.mada.org.il/ar/education/concepts/electricity/current
[7] http://www.mada.org.il/ar/education/concepts/electricity/potential
[8] http://www.mada.org.il/ar/education/concepts/electricity/resistance
[9] http://www.mada.org.il/ar/education/concepts/electricity/ohm
[10] http://www.mada.org.il/ar/education/concepts/electricity/electricshock
[11] http://www.mada.org.il/ar/education/concepts/electricity/discharge
[12] http://www.mada.org.il/ar/education/concepts/mechanics/newton
[13] http://www.mada.org.il/ar/education/concepts/mechanics/inertia
[14] http://www.mada.org.il/ar/education/concepts/mechanics/reciprocal-actions
[15] http://www.mada.org.il/ar/education/concepts/mechanics/tension
[16] http://www.mada.org.il/ar/education/concepts/mechanics/free-fall
[17] http://www.mada.org.il/ar/education/concepts/mechanics/friction
[18] http://www.mada.org.il/ar/education/concepts/mechanics/static-friction
[19] http://www.mada.org.il/ar/education/concept/mechanics/kinetic-friction