Seng Kwang Tan

10 January

Explanation for Water Bending with Static Electricity

Seng Kwang Tan 13 Electric Fields 0 Comments

It’s interesting to note the differing views regarding the explanation for how a thin stream of water can get bent when a charged object is placed near it. It started with these two videos from Veritasium:

This video then sets out to disprove Veritasium’s model of ions being removed from the water stream.

05 December

Simulation for Gravitational Field Strength and Potential

Seng Kwang Tan 07 Gravitation, Simulations 0 Comments

This simulation allows students to observe the variation of gravitational field strength and potential between two masses. Field strength is shown as vectors whereas potential is shown as scalar values on a plot. The resultant field strength and potential are shown in red.

https://ejss.s3.ap-southeast-1.amazonaws.com/gravitation_Simulation.xhtml

19 November

Man in Elevator Simulation

Seng Kwang Tan 03 Dynamics, Simulations 0 Comments

man_in_elevator_simulation

In this simulation, students can observe the variation of the normal contact force (N) and its effect on acceleration and velocity as an elevator moves upward.

Questions for students to work on can include:

  1. Express the acceleration as a function of Normal Contact Force (N), Weight (W) and mass of the man.
  2. Determine the distance travelled by the elevator.
  3. Predict how the forces, acceleration and velocity will differ if the elevator was moving down instead.

13 November

Internal Resistance and Maximum Power Theorem

Seng Kwang Tan 15 DC Circuits, IP4 12 DC Circuits, Simulations 0 Comments

I’ve created this simulation to demonstrate the effect of an internal resistance due to a cell on the potential difference and current of an external load.

One can also vary the internal resistance and external resistance to observe the maximum power theorem. The theorem states that for a given finite internal resistance, one can obtain the maximum external power only when the resistance of the load is equal to the internal resistance of the source.

internalresistance

https://ejss.s3.ap-southeast-1.amazonaws.com/internalresistance_Simulation.xhtml

12 November

Variable Resistor Simulation

Seng Kwang Tan 15 DC Circuits, Simulations 0 Comments

My third simulation in as many days. This time round, I created some png files for electrical circuit components that can be used for future simulations. I also figured out how to add text in line with a variable in the drawing panel for the simulation, hence the units can now follow the values of the meter readings.

https://ejss.s3.ap-southeast-1.amazonaws.com/variableresistor_Simulation.xhtml