Spinning Science: Disappearing Color!
Materials
- Paper plate
- Pencil
- Ruler
- Markers, crayons, or tempera paint (purple, blue, green, yellow, orange, red)
- String or yarn
- Have your child divide the plate into six equal sections using the pencil and ruler. As an added bonus, this step is a useful way to reinforce early fraction skills—in 1st grade math, kids are learning about halves, quarters, and thirds.
- Next, have him color each section of the plate a different color of the rainbow. Make sure he leaves no white showing!
- Punch two small holes in the center of the plate, about 1 cm apart. Thread the string or yarn through the holes.
- Hold one end of the string in each hand so that the color disk is in the middle. Wind up your disk by turning while you hold the string. One person holding each end of the string works best to keep the disk tight and spinning fast. When the string is wound up tight pull both hands away from each other so that your colored disk spins quickly.
- When observing the plate, the color will begin to blur together and eventually appear to disappear or turn white!
- You can try this activity a second time, dividing the plate in half, and using only two primary colors on your disk. Will the colors disappear again? Find out!
reference: http://www.education.com/activity/article/disappearing_color_science_first/
Density Column
Materials:
Procedures:
Pour your heaviest liquid into the center of whatever container you are using to make your column. If you can avoid it, don't let the first liquid run down the side of the the container because the first liquid is thick enough it will probably stick to the side so your column won't end up as pretty. Carefully pour the next liquid you are using down the side of the container. Another way to add the liquid is to pour it over the back of a spoon. Continue adding liquids until you have completed your density column . At this point, you can use the column as a decoration. Try to avoid bumping the container or mixing its contents.The hardest liquids to deal with are the water, vegetable oil, and rubbing alcohol. Make sure that there is an even layer of oil before you add the alcohol because if there is a break in that surface or if you pour the alcohol so that it dips below the oil layer into the water then the two liquids will mix. If you take your time, this problem can be avoided.
- honey
- corn syrup or pancake syrup
- liquid dishwashing soap
- water (can be colored with food coloring)
- vegetable oil
- rubbing alcohol (can be colored with food coloring)
- lamp oil
Procedures:
Pour your heaviest liquid into the center of whatever container you are using to make your column. If you can avoid it, don't let the first liquid run down the side of the the container because the first liquid is thick enough it will probably stick to the side so your column won't end up as pretty. Carefully pour the next liquid you are using down the side of the container. Another way to add the liquid is to pour it over the back of a spoon. Continue adding liquids until you have completed your density column . At this point, you can use the column as a decoration. Try to avoid bumping the container or mixing its contents.The hardest liquids to deal with are the water, vegetable oil, and rubbing alcohol. Make sure that there is an even layer of oil before you add the alcohol because if there is a break in that surface or if you pour the alcohol so that it dips below the oil layer into the water then the two liquids will mix. If you take your time, this problem can be avoided.
reference:http://chemistry.about.com/od/chemistryactivities/a/densitycolumn.htm