An image current is created in a ferromagnetic material in the presence of a real current.
What It Shows:
The demonstration is a realization of problem 5.17 in J.D. Jackson's Classical Electrodynamics, 3rd ed, (John Wiley & Sons, 1999) p.229. To paraphrase...
Ball shot horizontally, one dropped vertically; both hit the ground at the same time.
What it shows:
The horizontal and vertical motions of a projectile are independent of each other. So two objects falling under the influence of gravity from the same...
The two ends of a dial-type spring balance are each connected to strings which run over pulleys. With equal weights attached to the ends of the strings, the spring balance indicates the value of one of the weights.
Two forks, a cork, and a matchstick balance on the lip of a glass.
What it shows:
Balancing two forks in an unlikely configuration is a lesson in finding the center of mass and stable equilibrium. Nothing too deep here, but it's fun.
The concept of pressure is demonstrated by lying on a bed of nails.
What it shows:
The lecturer (or someone else) lies on a bed-of-nails without discomfort, thus demonstrating the concept of pressure, which is the force per unit area. For added drama the...
Sliding tablecloth out from under posh dinner setting.
What it shows:
A body will remain at rest unless a force acts upon it. So too will your best china remain in place as the table cloth is whipped from under it providing the friction between the cloth...
