Make spooky Halloween decorations!
Warning! Only under adult supervision.
- polarizer and ship from MEL STEM sets;
- Halloween decorations.
This city needs a new hero: prepare a bat stencil, insert the lens into the projector, and decorate the projector for Halloween. Flip the stencil upside down, combine it with the diffusion plate, and fix it to the projector. Point the projector at the wall and shine a bright light on the drawing. A bat will appear on the wall!
No storm can scare us: prepare pirate flags and a sail and fix them to the ship’s mast. Assemble the ship, set it in the water, and start the engine.
Mystical kaleidoscope: cut out a drawing from randomly-applied strips of Scotch tape. Stick them on a transparent plate and insert the plate into the polarizer. Rotate the gear of the polarizer and observe as the drawing shimmers with all the colors of the rainbow!
This city needs a new hero: The light from the flashlight hits the diffuser, uniformly illuminating the image cut from the opaque stencil. This glow hits the projector lens. The distance from the stencil to the screen is such that the image is inverted through the lens, so we flip the stencil with the projected image in advance!
No storm can scare us: the boat floats on the water thanks to the porous material from which its hull is made. The main propeller creates a thrust force that sets the boat in motion: while rotating, it passes air through itself, pushing off from it.
Mystical kaleidoscope: Light has an intrinsic property called polarization. A polarizing filter transmits light with only one polarization value, which corresponds to the orientation of the filter’s axis. When light passes through two polarizers, the amount of transmitted light depends on the relative orientation of the axes of the polarizers: the further they are from each other, the less light will pass through. Scotch tape changes the polarization of the light passing through it. This change depends on the orientation of the tape itself and, more interestingly, on the wavelength of the light wave (in other words, the color of the light). Therefore, the rays of some colors pass through a system of two polarizers and adhesive tape better than others. As a result, each area gets its own color, which changes when the polarizer is turned.
Exciting and safe experiments await you in the MEL Science subscription!