










Projectile
Motion 
拋物體運動 
The horizontal and vertical motions in a projectile are, respectively,
a motion of constant velocity and a motion exactly the same as a free fall.




Springmass
Oscillator 
彈簧質量諧振 
It underlines the connection between shm and circular motion. The
three kinematic graphs (xt, vt and at) of shm are plotted. 



Twobody
Motion 
二體運動 
Besides the real gravitational force, some hypothetical
ones (force proportional to r, proportional to 1/r) are taken as possible
options in the twobody interaction. 



Types
of Waves 
橫波與縱波，行波與駐波 

It gives a visual comparison between transverse and longitudinal waves,
traveling and standing waves. 



Longitudinal Traveling Wave 
縱 行 波 

Features are: (i) Color is lightened in rarefactions (ii) Displacementtime graphs at some selected points along the wave are plotted. 



Interference
of Water Waves 
水波干涉 
A noteworthy feature is a probe (the red dot) placed on the
water surface. The probe responses to the amplitude of surface oscillation at its location.
If it situates at a position of constructive (destructive) interference, the
light bulb will flash at full brightness (go off). 









Generalized
Lissajous Figures 
廣義利薩如圖形 
The conventional Lissajous figures are those with x and y coordinates
varying according to two sinusoidal waveforms of different frequencies
and phases. We introduce a little more complexity by raising the two numbers
to some positive integral powers. 



Electromagnetic
Induction (Motional emf) 
電磁感應(動生電動勢) 
Whenever a metal rod cuts across a magnetic field, an
emf will be induced. When this rod is a part of a complete circuit, an
induced current will flow. This induced current, together with the magnetic
field, will next produce a magnetic force on the moving rod. This magnetic
force, according to Lenz's law, must be .........




RLC
Series AC circuit 
RLC 串聯交流電路 

The
very core relevant concepts are incorporated in this simulation. It
has been found helpful for teachers to explain and students to
understand. 

