Artificial Magnetic Cloud
Hold the magnet and slowly draw the iron dust from the bottom of the container from outside, and then, move the magnet away. The iron dust will fall and form a dream-like "magnetic cloud." Now, use the magnet to attract the iron dust that is still falling, and you will see the iron dust start to gather again. When you look at the iron dust from across, you will find it align and stretch towards the outside in a distinctive pattern of lines. What are these lines?
Magnetic Property of Matter
Take up the sticks in turn. Keep each stick level and pass it through the magnetic arch from top to bottom. Which stick will be pulled by this externally applied magnetic field? When the pulling force appears, is it the force of attraction or repulsion? Why? Is the stick itself magnetic when it is pulled? After trying every stick, compare the pulling force and its strength of the sticks of different materials. It helps you to understand the magnetism of matter. After viewing the scientific explanation on the screen next to the device, think about it and see if you know what matter the magnetic arch contains. What kind of magnetism it has?
Magnetic Force - Attractive or Repulsive
The magnet at the center of the ring is attracted to the magnet outside, but the six small magnets around the ring are repelled by the external magnet. With this combination, what will happen when you bring the ring closer to the external magnet? Will they be attracted to or repelled by each other? What will happen when you bring them closer and pull away again? If you do not bring them closer on the same plane but on top of each other, what phenomenon can you observe? Will it be drawn in or bounced away? What will happen if you turn this vertical device upside down? Will the externally applied magnet fall or not?
Collision that Violates Energy Conservation？
Press the button and watch the ball slowly rolls down from the platform and collides into a string of five balls. The last ball gains the energy from the collision, and unexpectedly jumps to a higher position than the small ball that rolls down! This implies that it gains more potential energy. However, is this not violating the law of energy conservation? Here is your chance of play the observant Sherlock Holms, and see if you can find out the secret of this process that clearly violates the law of conservation of energy.
Magnetic Force against Gravitational Force
Take up the spiral metal on the table and try to attract the ball in the box. Bring the ball onto the top of each tube and let it fall into the tubes in turn. Observe whether it takes the same amount of time for the ball to fall out of each tube. If not, which tube takes the shortest time? Which one takes the longest? Why? If you are tall enough, after putting the ball into the tube, look into the tube from its top and observe the ball's slow but even falling process.
The Invisible Attractive Force
Press the button to electrify the coil. Then, insert sticks of different materials in turn into the center of the coil, and feel which stick is pulled or pushed. Is it attraction or repulsion? Why? If the coil is not electrified, can you observe the same phenomenon? Compare the material of each stick, and you will find out the magnetic characteristics of different materials.