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Videos tagged with physics (193)

MIT Physics Demo -- Dipole Antenna

MIT Physics Demo -- Dipole Antenna

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:57 | 39928 views

An RF transmitter is connected to a long antenna, emitting radio waves. A dipole antenna with a light bulb between its elements acts as the receiver. When the receiving antenna is parallel to the transmitter, the radio waves are absor...

MIT Physics Demo -- Microwave Polarization

MIT Physics Demo -- Microwave Polar...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:14 | 34783 views

A polarized microwave emitter and a polarized microwave receiver face each other on a table. At first, the emitter and receiver are polarized in the same direction (up-down), and all the emitted signal gets received. When a metal comb i...

MIT Physics Demo -- Microwave Interference

MIT Physics Demo -- Microwave Inter...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:02:11 | 27134 views

A double-horn microwave emitter faces a microwave receiver. The receiver is also connected to a speaker, which displays the received signal as audio, and an oscilloscope, which displays the signal visually. When the receiver is moved ...

MIT Physics Demo -- Driven Mechanical Oscillator

MIT Physics Demo -- Driven Mechanic...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:07 | 36246 views

A mass on a spring is driven by a large geared motor apparatus, and exhibits resonance at the appropriate frequency. Below resonance, the driving motion is in phase with the motion of the mass. At resonance the mass is 90 degrees out of...

MIT Physics Demo -- Resonant RLC Circuit

MIT Physics Demo -- Resonant RLC Ci...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:47 | 49165 views

A variable capacitor (C), large inductor or solenoid (L), and 200W light bulb (R) are connected in series to 120 VAC. The inductance of the inductor can be varied by inserting an iron core, and the capacitance can be varied by a row of ...

MIT Physics Demo -- Pendulum and Magnet

MIT Physics Demo -- Pendulum and Ma...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:11 | 40684 views

A solid copper pendulum is mounted between the poles of an electromagnet (solenoid). The pendulum is set into motion, and then the magnets are turned on. The magnets induce eddy currents in the copper which oppose the motion of the pe...

MIT Physics Demo -- Inductor Radio

MIT Physics Demo -- Inductor Radio

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:01 | 31049 views

One wire coil is connected to a radio, and another is connected to a speaker. The two coils are not connected to each other. The radio signal is transmitted through the induced magnetic field caused by the current in the wires. The s...

MIT Physics Demo -- Telegraph Transmitter

MIT Physics Demo -- Telegraph Trans...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:36 | 49756 views

A solenoid enclosed in another solenoid is connected to a 12 volt battery. Also contained in the circuit is an iron contact switch connected to a spring arm, with a gap on one side of it. When the circuit is closed, the inner solenoid a...

MIT Physics Demo -- Jacob's Ladder and the Melting Nail

MIT Physics Demo -- Jacob's Ladder ...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:26 | 48401 views

A solenoid is connected to AC power. First, a 10,000-turn coil is placed over the solenoid, but is not connected to the power source. However, the solenoid still induces current in coil, creating very high voltages because of the high...

MIT Physics Demo -- Back "emf" in a Large Solenoid

MIT Physics Demo -- Back "emf" in a...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:23 | 63489 views

A large solenoid is connected to DC power through a knife switch. When the switch is closed, the current builds up to approximately 30 amps. When the switch is opened, the solenoid attempts to keep the current flowing, creating a huge...

Physics Demo -- Jumping Ring

Physics Demo -- Jumping Ring

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:40 | 47181 views

A solid metal ring is placed on an iron core whose base is wrapped in wire. When DC current is passed through the wire, a magnetic field is formed in the iron core. This sudden magnetic field induces a current in the metal ring, which i...

Physics Demo -- Lenz's Law

Physics Demo -- Lenz's Law

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:29 | 48176 views

Two bar magnets of the same size are dropped through an aluminum tube and a glass tube. The magnet dropped in the glass tube falls at the normal rate of acceleration due to gravity, but the magnet falling through the metal tube is slow...