Name:__________________________________ Grade & Sec.:___________ Score:________
Teacher:________________________________ Date:__________________ Rating:_______
Activity 1
The dancing salt and the moving beads!
Objectives:
At the end of the activity, you will be able to infer that:
1. sound consists of vibrations that travel through the air; and
2. sound is transmitted in air through vibrations of air particles
Materials:
1 rubber band
1 piece of plastic sheet
1 empty large can of powdered milk - 800 g
1 wooden ruler
1 empty small can of evaporated milk - 400 mL
rock salt
1 dowel or 1 wooden rod
1 blue bead
4 colored beads
3 inches of tape
2 large books
scissors
5 pieces of string
paper
slinky spring
transistor radio
Procedure:
Part A: Vibrations produce sound
1. Prepare all the materials needed for the activity. Make sure that you find a work area
far enough from other groups.
2. Put the plastic tightly over the open end of the large can
and hold it while your partner puts the rubber band over it.
3. Sprinkle some rock salt on top of the plastic.
4. Hold the small can close to the salt and tap the side of the
small can with the ruler as shown in Figure 4.
Q1. What happens to the salt?
5. Try tapping the small can in different spots or holding it in different directions. Find
out how you should hold and tap the can to get the salt to move and dance the
most.