Simulation: Faraday's Law of Induction

This simulation traces the flux linkage and corresponding emf generated by a rectangular coil rotating along an axis perpendicular to a uniform magnetic field. One is able to modify the angular frequency to see the effect on the frequency and peak emf generated.

DeLight Version 2

I modified "DeLight", the board game that I designed a few years back into a worksheet version (for small groups) as well as a powerpoint version (that teacher can facilitate as a class activity, pitting half the class against another).

Worksheet: DOWNLOAD

Slides: DOWNLOAD

The objectives of the game is to reinforce concepts related to D.C. Circuits such as:

  1. Sum of potential difference (p.d.) across parallel branches of a circuit is the same.
    E = V_1 + V_2 + V_3 +...
  2. P.d. across a device is given by the ratio of resistance of device to total resistance multiplied by emf (potential divider rule)
    V_1 = \frac{R_1}{R_{total}}\times E
  3. Brightness of light bulb depends on electrical power
    P = IV = \frac{V^2}{R} = I^2R
  4. Current can bypass a device via a short-circuiting wire.

The worksheet and powerpoint slides contain a few examples that allow discussion on the above concepts based on some possible gameplay outcomes. For example, the following is a game where the blue team wins because the p.d. across each blue light bulb is twice that of the p.d. across each red light bulb.

In the following scenario, the game ended in a draw. Students may not be able to see it immediately, but the blue light bulb with a vertical orientation is actually short-circuited by the vertical branch on its right.

Feel free to use and/or modify the game to suit your own class needs.

Explanation for Water Bending with Static Electricity

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.

Simulation for Gravitational Field Strength and Potential

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.

Simulation on Gravitational Field Strength and Potential
Simulation on Gravitational Field Strength and Potential

Falling with Parachute

The following simulation allows users to observe the effect of air resistance on a parachutist before and after he opens his parachute. Try to open the parachute when the man first reaches terminal velocity and observe the changes in velocity.

Falling with parachute
Falling with parachute simulation

Box on a Slope Simulation

This simulation allows students to observe the variation of the normal contact force N acting on a box placed on a frictionless slope with the angle of inclination of the slope changing. It also allows them to see how the Weight vector W can be resolved into two components, with the one perpendicular to the slope being equal at all times to N. Meanwhile, the component of W parallel to the slope being proportional and in the same direction as acceleration.

boxonslope

Man in Elevator Simulation

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.