\nTake two glass prisms separated by a small gap. Investigate under what conditions light incident at angles greater than the critical angle is not totally internally reflected.
\n
![](\"https:\/\/i0.wp.com\/archive.iypt.org\/problems\/18_IYPT_1.gif?w=648&ssl=1\")
<\/p>\n1. Dragonfly<\/b>
\nPropose a model of how a dragonfly flies. Investigate the major parameters and validate your model.<\/p>\n
2. The two ball problem<\/b>
\nTwo balls placed in contact on a tilted groove sometimes do not roll down. Explain the phenomenon and find the conditions, under which it occurs.<\/p>\n
3. Avalanche<\/b>
\nUnder what conditions may an avalanche occur? Investigate the phenomenon experimentally.<\/p>\n
4. Hydraulic jump<\/b>
\nWhen a smooth column of water hits a horizontal plane, it flows out radially. At some radius, its height suddenly rises. Investigate the nature of the phenomenon. What happens if a liquid more viscous than water is used?<\/p>\n
5. Mirage<\/b>
\nCreate a mirage like a road or desert mirage in a laboratory and study its parameters.<\/p>\n
6. Noise<\/b>
\nWhen a droplet of water or other liquid falls on a hot surface, it produces a sound. On what parameters does the sound depend?<\/p>\n
7. The bouncing plug<\/b>
\nA bathtub or sink is filled with water. Remove the plug and place a plastic ball over the plughole. As the water drains the ball starts to oscillate. Investigate the phenomenon.<\/p>\n
8. Windcar<\/b>
\nConstruct a car which is propelled solely by wind energy. The car should be able to drive straight into the wind. Determine the efficiency of your car.<\/p>\n
9. Sound in the glass<\/b>
\nFill a glass with water. Put a tea-spoon of salt into the water and stir it. Explain the change of the sound produced by the clicking of the glass with the tea-spoon during the dissolving process.<\/p>\n
10. Flow rate<\/b>
\nCombine powdered iron (iron filings) with a vegetable oil. Connect two containers with plastic tubing and allow the mixture to drain through the tube. Develop an external mechanism to control the flow rate of the mixture.<\/p>\n
11. Water droplets<\/b>
\nIf a stream of water droplets is directed at a small angle to the surface of water in a container, droplets may bounce off the surface and roll across it before merging with the body of water. In some cases the droplets rest on the surface for a significant length of time. They can even sink before merging. Investigate these phenomena.<\/p>\n
12. Ball spin<\/b>
\nSpin can be used to alter the flight path of balls in sport. Investigate the motion of a spinning ball, for example a table-tennis or tennis ball, in order to determine the effect of the relevant parameters.<\/p>\n
13. Hard starch<\/b>
\nA mixture of starch (e.g. cornflour or cornstarch) and a little water has some interesting properties. Investigate how its \u201cviscosity\u201d changes when stirred and account for this effect. Do any other common substances demonstrate this effect?<\/p>\n
14. Einstein – de Haas Experiment<\/b>
\nWhen you apply a vertical magnetic field to a metallic cylinder suspended by a string it begins to rotate. Study this phenomenon.<\/p>\n
15. Optical tunnelling<\/b>
\nTake two glass prisms separated by a small gap. Investigate under what conditions light incident at angles greater than the critical angle is not totally internally reflected.
\n<\/p>\n
16. Obstacle in a funnel<\/b>
\nGranular material is flowing out of a vessel through a funnel. Investigate if it is possible to increase the outflow by putting an \u201cobstacle\u201d above the outlet pipe?<\/p>\n
17. Ocean \u201cSolaris\u201d<\/b>
\nA transparent vessel is half-filled with saturated salt water solution and then fresh water is added with caution. A distinct boundary between these liquids is formed. Investigate its behaviour if the lower liquid is heated.<\/p>\n","protected":false},"excerpt":{"rendered":"
1. Dragonfly Propose a model of how a dragonfly flies. Investigate the major parameters and validate your model. 2. The two ball problem Two balls placed in contact on a tilted groove sometimes do not roll down. Explain the phenomenon and find the conditions, under which it occurs. 3. Avalanche Under what conditions may an […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-1934","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P4R8YU-vc","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1934","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/comments?post=1934"}],"version-history":[{"count":2,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1934\/revisions"}],"predecessor-version":[{"id":2042,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1934\/revisions\/2042"}],"wp:attachment":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/media?parent=1934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}