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Welcome Per-Eric Åhlén and Morgan Leander Karlstads University, Sweden Karlstad.

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Presentation on theme: "Welcome Per-Eric Åhlén and Morgan Leander Karlstads University, Sweden Karlstad."— Presentation transcript:

1 Welcome Per-Eric Åhlén and Morgan Leander Karlstads University, Sweden Karlstad

2 Resonance with musical box Oscillation together with the wall?

3 Modern Physics Photoelectric cell

4

5 REFLECTION i r i r

6 Polarisation Polarized light Unpolarized light

7 To the right we imagine an light wave incident from the left onto a polaroid filter. If the incident wave is unpolarised, then one-half of the wave will emerge from the polaroid filter. We call this orientation of the polaroid zero degrees, and the orientation is indicated by a red arrow. If we place a second filter behind the first with the same orientation, the second filter has no effect: one-half of the incident beam emerges from the first filter and all of that beam emerges from the second filter. If we place a second filter behind the first one that is oriented at 90 degrees relative to the first one, no light emerges from the second filter. This is perhaps expected, since the 2 polarisations that are being selected by the filters are perpendicular to each other. This is also the result predicted by Malus' Law.

8 Total reflection and optic fiber

9 Magic Illusion

10 Rainbow - What is light?

11 It was a stack of coin What does Newton laws say?

12 Rotating eggs Which one is raw and which one is boiled?

13 Hovercraft

14 IMPETUS

15 Snatch or not Which thread breaks first if you pull slowly respectively fast? Give a physical explanation

16 In which direction will it roll? If the spool is pulled horizontally to the right, in which direction will it roll? 1.to the left? 2.to the right? 3.others... Think about it And explain why ? What if it is pulled in the following way?

17 Torque = Force magnitude lever arm τ = F a F a F a

18 In which direction will it roll?

19 Is this realy possible? Do you see the pattern? 1/2 1/4

20 Circular motion

21 Falling coffee cup

22 How much can you lift? M = m e Θf (m=0,1 kg, f = 0,3) Θ= 11π (5,5 turn): M=3200kg Θ: 31,5 turn: M= 6 10 24 kg (the earth) Θ: 52 laps: M = 4 10 41 kg (the Milky Way) m M

23 Bouncing balls

24 Golfplayer F = ma F = m · v/ t F · t = m · v At start v o =0 F ·(t -0) = m · (v-0) F ·t = m · v

25 Cartesian divers

26 Particeltheory about air Materiel: A syringe. Intention: Three event in daily life A suction cap sits on the tiled wall in the bathroom. Why is it so hard to loose. A football is pumped up. It gets harder and harder but not bigger. Why? Freshly boiled jam is poured when it is hot into a pot. The pot is put into the refrigerator. Then it gets cold it is almost impossible to open. Why? What is common with this three course of events? K

27 Why isnt the plunger moving? There are billions of billions molecules bouncing on the plunger, pushing it out. Still it isnt moving. There are also a lot of molecules bouncing on the outside of the plunger, pushing it in. K K

28 Why can you press air together? Hold the thumb for the spout and push. There is a lot of space between the molecules. It is vacuum. Therefore you push the molecules closer to each other. K Starting position of the plunger. K

29 Why will the resistance increase the more you push? The molecules come closer together and the bounces against the plunger per second will be more compared with the starting point. But on the outside it will be the same as before. The pressure from the inside of the syringe is greater. Therefore will the plunger return to the starting point if you let it loose. K

30 Why will an amount of air expand when it is heated? The heating makes the molecules mowing faster and bounces more on the inside of the plunger than the outside. K The plunger moves out Heat supply K

31 Vacuum A syringe with the plunger at the bottom. Hold the thumb for the spout and pull. No air can leak in. What will happen? Explain your prediction with help of the theory about air. If possible repeat the experiment. Explanation: It is vacuum in the syringe. When you pull the plunger is the molecules pushing on the outside of the plunger and the air pressure is bigger on the outside

32 1. Push the plunger to the bottom I a syringe. 2. suck up 1 -2 cm water in the syringe. 3. Hold the thumb for the spout and pull. No air can leak in. What will happen? Another experiment with a syringe H2OH2O H2OH2O Vac- uum 1. 2. 3. H2OH2O

33 Glowing steel wool!!!!

34 1. The battery send out a lot of workers in the wire. The amount of workers per second we usually call current. 2. The workers have negative charge and seek the positive terminals of the battery. The voltage makes them move. 3. The workers slow down, that is to say, meet resistance e.g. in the steel wood. The voltage is the same. That is the work they are doing in the steel wool. 4. The workers spend their energy and get hot e.g. the steel wool. 5. The workers have emitted their energy and the voltage falls. They need new energy let us go to the battery. 1. 2. 3. 4. 5.

35 Magic Ballon at the wall How is it possible?

36 The Balloons

37

38 3. Trick with Water Jet

39 Electroscope

40 WRONG??

41 A simple electric circle

42 Playing on straw It´s about standing waves

43 Standing waves

44 The forces of love


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