212 results found for physics

Kelly Schwirian presents on nuclear power in the United States.

How we are affected by the very widespread manifesations of diffraction.

John talks about diffraction and the limits it puts on our ability to image atoms. Can we make an electron-microscope without lenses?

In finite objects, the total external force equals the total mass times the acceleration of a point called the centre of mass.

Looking at how hard disk drives can be improvedn

The total work done on an object equals the increase in its kinetic energy. For conservative forces, we can define potential energy.

Professor Harrison Prosper of FSU Physics Department looks at the science behind the recently released movie 'Angels and Demons', starring Tom Hanks and based upon a Dan Brown novel. Prof. Prosper discusses topics such as antimatter, dark matter, dar....

A short video showing a simple classroom method of checking the way in which this force is related to mass, speed and radius.

A presentation showing both the ideas about centripetal force and a simple classroom method of checking the way in which this force is related to mass, speed and radius.

A short clip showing the experimental measurement of the speed of electrical pulses in a cable - a large fraction of the speed of light.

A presentation showing how to measure the speed of sound over a short distance on a laboratory table.

A short clip showing the measurement of the speed of sound over short distances.

Carefully distinguish mass and weight. Hooke's law quantifies deformation. Contact forces have normal and frictional components.

Dr. Tonomura is a world renowned pioneer and authority in the field of electron holography, for which he has received many national and international recognitions. He is recognized for his contributions in the development of electron holography, the ....

Light is reflected off a flexible shiny surface fixed to the end of a plastic tube. When one speaks into the tubes sound vibrations pass down the tube and make the surface vibrate. The reflected light is therefore sent off from the surface in a con....

When two different types of conductors are pushed into a potato chemical reactions take place charging them up - we have a simple electrochemical cell. A potato, zinc screw and carbon rod produce about 1V. We experiment joining a few of these cells u....

This is a simple yet effective demonstration of electricity generation. 500 turns of wire are wound onto a 35mm film can and the two ends are attached to an LED light. A strong magnet is placed in the can and the lid fixed back in place. The generato....

When two different metals are placed in a salt solution (an electrolyte) the chemistry produces a voltage. This is called a cell. By wiring up a number of these cells we can make a battery and use it to power electrical circuits.

Converting wind power into electricity seems like an ideal way of helping to solve our energy problems. However, the power generated by a windmill is dependent on the wind speed. If the wind drops to half its speed there is as little as an 1/8th of t....

Parabolic surfaces can be used to concentrate energy for example to focus sunlight to heat things. Using an old World War II spot light mirror we demonstrate how easy it it is to concentrate enough energy to cause combustion. Finally, we show how to ....

A short video explaining how to measure temperature.

John Murrell explains scales and colour changes with temperature, boiling and melting,