Nat Sci 1 Last Assignment Samples

Good Morning, everyone!

Here's an example of the video you're going to make. To make it really authentic you should be seen in the video. ^_^

To make things easier for you, I have listed below some of the simplest demonstrations. You may choose one among these. Or if you know something else, better than any of these, perform that. It's really up to you.One group should perform only one .

Hope you'll have fun doing this!

A. Dancing Wire
1. Take two identical water glasses and use a measuring cup to fill each with the exact same amount of water.
2. Cut a piece of thin wire that's inch longer than the diameter of one of the glasses.
3. Place the wire across the top center of one glass.
4. Bend the wire so 1/4 inch hangs over each side to keep the wire in place.
5. Rub your finger along the outer rim of the second glass to make sound and watch the wire move. Since both glasses have equal amounts of water, they both have the same natural frequency. Sound is transferred from one glass to the next and thus the vibrations cause the wire to move

B. Seeing Sound
This is a simple experiment that requires very little setup and only three materials.
1. Tie a piece of thread to some tissue paper and hold the tissue paper by the thread in front of a speaker.
2. Turn on the music and observe what happens to the tissue paper.
3. Try different types of music at different volumes and see if there's any change to the paper.
4. The tissue should move when the music is played.

C. Model Eardrum
1. Stretch plastic wrap tightly over a wide mouthed container like a bowl or pot.
2. Place 20 to 30 grains of rice on top of the plastic.
3. Bang a metal cookie sheet or something equally as loud to make noise close to the plastic wrap.
4. Watch as the grains of rice move. The plastic wrap reacts to sound waves in a way similar to the human eardrum.
5. Have your friend make noises to see if they can make the rice move.

D. Sound Waves Blowing Out a Candle

Materials To make a candle snuffer, you need a 2-liter plastic soft drink bottle, plastic wrap, a rubber band that will fit tightly around the largest part of the bottle, scissors, a small candle in a holder and matches or a lighter.
1. Cut off the base of the bottle.
2. Poke the sharp end of a pair of scissors through the plastic to make an opening for your scissors. The edge of the plastic can be sharp, so use caution as you cut.
3. Stretch a piece of plastic wrap tightly over the cut end of the bottle, leaving a small overhang. Secure the plastic wrap around the bottle's circumference with a rubber band.
4. Stand the candle on a table or stable flat surface, and then light the candle.
5. Point the neck end of the bottle at the flame, about two-inches away from the flame.
6. Sharply tap the plastic wrap with your finger as if it is a drum. Listen for the sound you create and observe the candle's flame.

Reference:
www.ehow.com