1.  Two-ball: Balls placed in contact on a tilted groove sometimes Do not roll down.  Explain the phenomenon and find the conditions under which it occurs.

2. Mirage:  Create a mirage like a road or desert mirage in a laboratory and study its parameters.

3. Fountain: Construct a fountain with a 1-meter head of water. Optimize the other parameters to gain the maximum jet height. Use several liquids.

4. Small fields: Construct a device to measure magnetic fields based upon a compass needle and use your device to measure the Earth’s magnetic field.