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IB Physics Help Video Podcast
1. Quick Demo: Eddy current brake
| A spinning copper disc is slowed down when a magnet is brought near it. Note that copper is not a magnetic material.Eddy currents are induced in the disc due to the relative motion of the disc and the magnet. The magnetic fields associated with these currents have such a direction that they oppose t
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| Published on Sat, 22 Oct 2011 16:33:00 +0000 - 32 MB Format: QUICKTIME Video
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2. Episode #9: Electromagnetic Induction
| This episode is an introduction to electromagnetic induction. The presentation is supported by many experimental demonstrations. The video covers the following topics: 1. Oersted’s discovery of the magnetic effect of an electric current (sometimes called the “motor effect” as it i
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| Published on Sat, 14 May 2011 22:30:58 +0000 - 89 MB Format: QUICKTIME Video
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3. Quick Demo: Variation of the electric current in a DC motor
| The current drawn by a simple motor may vary in time depending on what the motor does at any given instant.1. When a motor is connected to a battery, the current in the coil (or armature) increases dramatically but as soon as the coil starts rotating increasingly faster, the current drops and settle
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| Published on Mon, 11 Apr 2011 12:56:00 +0000 - 9 MB Format: QUICKTIME Video
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4. Episode #8: Simple Harmonic Motion (Part 2)
| Topics covered in this episode: (a) The period of a gravitational pendulum (b) Using a gravitational pendulum to determine the acceleration due to gravity, g, (c) Measuring mass using harmonic oscillators, (d) Energy in SHM, (e) Connection between SHM and uniform circular motion.
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| Published on Thu, 10 Mar 2011 18:35:56 +0000 - 83 MB Format: QUICKTIME Video
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5. Quick Demo: Voltage across terminals of a battery
| This video shows a simple circuit consisting of a light bulb and a variable resistor (rheostat). The voltmeter measures the voltage across the terminals of the battery: V = emf - Ir, where emf is the electromotive force of the battery, I is the electric current in the circuit and r is the internal r
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| Published on Sun, 02 Jan 2011 17:39:25 +0000 - 21 MB Format: MP4 Video
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6. Quick Demo: Applications of electromagnetic induction
| This video shows a couple of torches/flashlights that use electromagnetic induction to function. They do not need batteries. The second part of this video shows a simple handheld electric generator which is one of the most common applications of electromagnetic induction. The video also shows that t
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| Published on Sun, 02 Jan 2011 17:19:00 +0000 - 21 MB Format: MP4 Video
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7. Quick Demo: Electromagnetic induction
| When a magnet is moved in or out of a coil, a current is induced in the coil. The size of the induced current depends on how fast the magnet is moved. The direction of the induced current depends on the polarity of the magnet and on the direction in which the magnet moves (i.e. towards the coil or a
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| Published on Thu, 30 Dec 2010 19:03:00 +0000 - 24 MB Format: MP4 Video
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8. Quick Demo: Motor effect
| A current-carrying conductor placed in a magnetic field experiences a force. The direction of this force depends on the direction of the magnetic field and the direction of the electric current. If the conductor is perpendicular to the magnetic field lines, the size of the force can be calculated us
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| Published on Thu, 30 Dec 2010 18:46:00 +0000 - 16 MB Format: MP4 Video
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9. Quick Demo: Magnetic effect of an electric current
| When a current passes through a conductor or a coil, a magnetic field is created in the surrounding space. Its presence can be revealed by using a compass needle. Changing the direction of the current changes the polarity of magnetic field produced.
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| Published on Thu, 30 Dec 2010 17:24:00 +0000 - 18 MB Format: MP4 Video
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10. Episode #7: Simple Harmonic Motion (Part 1)
| This video is an introduction to simple harmonic motion (SHM).SHM is a type of periodic motion for which the force that drives it is proportional to the displacement from the equilibrium position. What is the equation that describes this type of motion? The answer and more in this episode. This f
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| Published on Sun, 07 Nov 2010 16:30:00 +0000 - 95 MB Format: QUICKTIME Video
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