Radio waves and radiotelescopes. Made by NASA.
Other videos from this series
Monday, 28 February 2011
Dynamics of the rotor
A rotor in action in some amusement park:
The forces acting on a passenger:
Other animations by Yves Pelletier
The forces acting on a passenger:
Other animations by Yves Pelletier
Rolling motion
As the wheel rotates a complete revolution (without slipping), its center moves a linear distance equal to the circumference.
Other animations by Yves Pelletier
Other animations by Yves Pelletier
Electromagnetic wave
This short animation illustrates the propagation of a linearly polarized electromagnetic wave. The electric field is shown in blue, and the magnetic field in red.
1D Standing Wave Patterns
This animation shows an assortment of standing wave patterns under varied boundary conditions.
Other animations by Penn State Schuylkill
Other animations by Penn State Schuylkill
Sunday, 27 February 2011
Quarks (Sixty Symbols)
Professor Roger Bowley and Professor Ed Copeland from the University of Nottingham talk about quarks.
Source: Sixty Symbols
Source: Sixty Symbols
Relativity (Cassiopeia Project)
Here is a very nice documentary about relativity.
Special relativity: time dilation, lenght contraction. General relativity: curvature of space-time (chapter 5), black holes (chapter 6).
Source: Cassiopeia Project
Other Cassiopeia Project videos
Chapter 1:
Chapteur 2:
Chapter 3:
Chapter 4:
Chapter 5:
Chapter 6:
Special relativity: time dilation, lenght contraction. General relativity: curvature of space-time (chapter 5), black holes (chapter 6).
Source: Cassiopeia Project
Other Cassiopeia Project videos
Chapter 1:
Chapteur 2:
Chapter 3:
Chapter 4:
Chapter 5:
Chapter 6:
Saturday, 26 February 2011
Thursday, 24 February 2011
Einstein for everyone
Short Einstein's biography. E = mc^2, special relativity, general relativity, some anecdotes.
General public, no maths.
Other lectures from Jefferson Lab Science Series
General public, no maths.
Other lectures from Jefferson Lab Science Series
The Reason for the Seasons
Seasons are created by the position of the Sun relative to the orientation of the Earth's rotation axis. As the Earth orbits the Sun, this relative position changes.
Source: Penn State Schylkill
Other animations by Penn State Schuylkill
Source: Penn State Schylkill
Other animations by Penn State Schuylkill
Wednesday, 23 February 2011
MIT 8.01 Classical Mechanics Lecture 8
MIT Physics Course
Professor Walter Lewin
8.01 Physics I: Classical Mechanics, Fall 1999
Friction (at the end: an old movie showing a flee pulling a large frictionless object!)
See other videos in this series.
Friction (at the end: an old movie showing a flee pulling a large frictionless object!)
See other videos in this series.
Monday, 21 February 2011
Sunday, 20 February 2011
MIT Physics Demo -- Pendulum and Magnet
A solid copper pendulum is set into motion between the poles of an electromagnet. The magnets induce eddy currents in the copper which oppose the motion of the pendulum. The pendulum quickly slows to a stop.
When a copper pendulum with strips cut into it is swung between the same magnets, it is not slowed nearly as much as the solid pendulum. This is because the cuts in the copper prevent large eddy currents from forming.
Source: MIT TechTV
See other MIT physics demos
When a copper pendulum with strips cut into it is swung between the same magnets, it is not slowed nearly as much as the solid pendulum. This is because the cuts in the copper prevent large eddy currents from forming.
Source: MIT TechTV
See other MIT physics demos
Saturday, 19 February 2011
Yale: Frontiers and Controversies in Astrophysics, Lecture 7
Source: Yale University, Open Yale Courses
Third method to detect exoplanets: astrometry (and comparison with other methods: radial velocity and transit). In the last 10 minutes: presentation of some upcoming projects: Kepler mission (transits), SIM mission (astrometry), Terrestrial Planet Finder (direct planet imaging).
See other lectures in this series.
Third method to detect exoplanets: astrometry (and comparison with other methods: radial velocity and transit). In the last 10 minutes: presentation of some upcoming projects: Kepler mission (transits), SIM mission (astrometry), Terrestrial Planet Finder (direct planet imaging).
See other lectures in this series.
Friday, 18 February 2011
Thursday, 17 February 2011
The Human Body is the Ultimate Physics Laboratory
The Tyndall Lecture by Dr Kevin McGuigan: 'The Human Body is the Ultimate Physics Laboratory' toured Ireland from 20 January - 12 February 2009. We explore how the same physical principles determine the size of an aneurysm, the characteristic tone of flatulence or the curvature of a David Beckham free-kick.
Using the latest images, movies and demonstrations we see why perspiration is much more socially acceptable compared the cooling methods used by other animal species. A forensic examination of road traffic collisions and the injuries they produce reveal that the physical cause for these is often closely related to one of the roles played by saliva!
Source: Institute of Physics
Using the latest images, movies and demonstrations we see why perspiration is much more socially acceptable compared the cooling methods used by other animal species. A forensic examination of road traffic collisions and the injuries they produce reveal that the physical cause for these is often closely related to one of the roles played by saliva!
Source: Institute of Physics
Wednesday, 16 February 2011
Beats animation
2 waves (green and cyan) have slightly different frequency. The amplitude of the resultant wave (yellow) varies with time.
Other animations by Yves Pelletier
Other animations by Yves Pelletier
Tuesday, 15 February 2011
MIT 8.01 Classical Mechanics Lecture 7
MIT Physics Course
Professor Walter Lewin
8.01 Physics I: Classical Mechanics, Fall 1999
Various applications of Newton's 2nd law. Weight, weigthlessness.
See other videos in this series.
Monday, 14 February 2011
Physics of Hockey
Brad Orr, from University of Michingan Physics Department.
Why ice is slippery? Shooting. How padding protects from collisions.
Why ice is slippery? Shooting. How padding protects from collisions.
Sunday, 13 February 2011
Jumping Ring
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 in turn creates another magnetic field that opposes the original field. This causes the ring to briefly jump upwards.
If there is a cut in the ring, it cannot form current inside it, and thus will not jump.
When the ring is cooled in liquid nitrogen, the resistance of the metal is lowered, allowing more current to flow. This lets the ring jump higher. However, the magnetic field curves away at the top of the iron coil, meaning with DC power, the ring will never fly off the top.
When AC current is passed through the wire, the ring flies off the top of the iron core. This is due to the fact that the current lags the emf by 90 degrees in inductors (which is what we have here). This yields forces on the ring that are always pointing upwards, even as the current oscillates.
Source: MIT TechTV
See other MIT physics demos
If there is a cut in the ring, it cannot form current inside it, and thus will not jump.
When the ring is cooled in liquid nitrogen, the resistance of the metal is lowered, allowing more current to flow. This lets the ring jump higher. However, the magnetic field curves away at the top of the iron coil, meaning with DC power, the ring will never fly off the top.
When AC current is passed through the wire, the ring flies off the top of the iron core. This is due to the fact that the current lags the emf by 90 degrees in inductors (which is what we have here). This yields forces on the ring that are always pointing upwards, even as the current oscillates.
Source: MIT TechTV
See other MIT physics demos
Saturday, 12 February 2011
The physics of baseball
Jefferson Lab's Science Series
Speaker: Dr. Alan Nathan, University of Illinois at Urbana-Champaign
Date: March 28, 2002
Other lectures from Jefferson Lab Science Series
Speaker: Dr. Alan Nathan, University of Illinois at Urbana-Champaign
Date: March 28, 2002
Other lectures from Jefferson Lab Science Series
Friday, 11 February 2011
Nearsightedness and Farsightedness
Normal vision, myopia (nearsightedness, shortsightedness), yyperopia (farsightedness,longsightedness hypermetropia), presbyopia.
Thursday, 10 February 2011
Yale: Frontiers and Controversies in Astrophysics, Lecture 6
Source: Yale University, Open Yale Courses
Finding planets from transits: some planets are discovered when they partially obscure light coming from star. Planetary migration.
See other lectures in this series.
Finding planets from transits: some planets are discovered when they partially obscure light coming from star. Planetary migration.
See other lectures in this series.
Magnetic Motor
A toroid with three different wire windings is connected to 220 VAC 3-phase voltage. The voltage phase of each of the three windings lags 120 degrees behind the next, creating a changing induced magnetic field. The changing field causes metal objects to rotate when placed inside.
See other MIT physics demos
See other MIT physics demos
Boundary Conditions on a String
If the end of the string is fixed (hard reflection), the reflected impulse is reversed. If the end of the string is free to move (soft reflection), the reflected impulse is not reversed.
Other animations by Penn State Schuylkill
Other animations by Penn State Schuylkill
Wednesday, 9 February 2011
X-Ray interactions
This animation illustrates the five primary mechanisms by which high energy photons interact with matter: coherent scattering, Compton effect, photoelectric effect, pair production and photodisintegration.
Other animations by Penn State Schuylkill
Other animations by Penn State Schuylkill
Tuesday, 8 February 2011
MIT 8.01 Classical Mechanics Lecture 6
MIT Physics Course
Professor Walter Lewin
8.01 Physics I: Classical Mechanics, Fall 1999
Newton's laws, inertial frame of reference, action and reaction, Hero's engine. Detailed example: an object at rest suspended by 2 strings.
See other videos in this series.
Newton's laws, inertial frame of reference, action and reaction, Hero's engine. Detailed example: an object at rest suspended by 2 strings.
See other videos in this series.
Saturday, 5 February 2011
Eureka! Episode 5 - Acceleration II
How to calculate acceleration when we know the change in velocity and the time.
Other Eureka episodes
Other Eureka episodes
Cloud Chamber
Subatomic particles such as cosmic ray muons, alpha particles, and high energy electrons are striking our bodies all the time. In the cloud chamber, these particles ionize air molecules, creating delicate cloud trails by condensing supersaturated alcohol vapor. This is similar to the way condensation trails are formed in the sky behind airplanes.
This is about as close as you'll ever get to seeing subatomic particles with your own eyes...
See other MIT physics demos
See other MIT physics demos
Thursday, 3 February 2011
Hinged Stick and a Falling Ball
Two wood boards are connected by a hinge. A small cup is mounted near one end of the upper board with a tee for a ball on the end. The board is lifted to a certain height, and when released the ball ends up in the plastic cup. This shows that the board has moved farther than the ball in the same period of time.
Source: MIT TechTV
See other MIT physics demos
Source: MIT TechTV
See other MIT physics demos
Julius Sumner Miller - Mechanical Toys
Julius Sumner Miller uses various mechanical toys to illustrate physics principles.
Other physics demonstrations by Julius Sumner Miller
Other physics demonstrations by Julius Sumner Miller
Coupled pendulums
Two pendulums attached to the same horizontal string transfer their motion back and forth.
Wednesday, 2 February 2011
Mechanical Advantage - Pulleys
Mechanical advantage of a fixed pulley, a movable pulley and a chain block.
MIT 8.01 Classical Mechanics Lecture 5
MIT Physics Course
Professor Walter Lewin
8.01 Physics I: Classical Mechanics, Fall 1999
Uniform circular motion. At 12 minutes: experiment showing that if we stop pulling the object toward the center, its motion become linear. Orbits of planets. Centrifuging a wet lettuce. Artificial gravity. Centrifuge demonstration. Bucket of water in vertical circular motion.
See other videos in this series.
Tuesday, 1 February 2011
Brightstorm: Gravity Overview
Introduction to gravitational force. Distinction between mass and weight. How to calculate weight from mass.
See other Brighstorm videos
See other Brighstorm videos
Subscribe to:
Posts (Atom)