Exploring Sound and Energy

Maria and Sarah made a set of paper cup telephones. First, the girls punched a hole in the bottom of each cup. Then they connected the cups with a very long piece of string, knotted in the bottom of each cup. Maria went down the hall to her bedroom while Sarah stayed in the kitchen. When Maria put the cup to her ear she could hear Sarah talking to her because

• they were not that far from each other.

• sound waves traveled through the string to Maria’s cup.

• sound waves traveled through the air from room to room.

• sound waves bounced off of the walls to reach Maria in the bedroom.

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Samantha's 4th grade science class is conducting a STEM experiment building boats. The class was divided into four groups and each group was given a Styrofoam bowl, 6 inches of tape, a straw, and a piece of paper. Each group had to create a boat using only these materials. The group whose boat went the farthest distance would receive an A for the day. Two of the groups used the bowl as the base of the boat and taped the straw into a standing position. They then folded the paper into a triangular shape and taped it to the straw. Why was taping the triangular paper the most important part of the boat?

• The paper makes the boat level so the boat does not tip over.

• The paper is used as an oar to move the boat in a forward motion.

• The paper serves as a sail to catch the wind and cause the boat to move farther.

• The paper serves as an attempt to prevent the boat from taking on water and sinking.

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This is a wind turbine. Wind flows over the blades and causes them to turn. The blades are connected to a rod inside the tower. The rod connects to a generator that turns the wind energy into

• air.

• electricity.

• smoke.

• water.

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One day, when you are taking a nature walk, you hear a bird launch into the air and begin to fly, chirping the whole time. Even though you cannot see the bird through the limbs and leaves, you know something about its direction. You can tell the bird is flying _______________ because the sound of its chirping is getting softer and softer.

• towards you

• away from you

• a circle around you

• in a zig-zag pattern

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When you hit two stones together, they produce sound because

• your hands vibrate.

• the stones are hard.

• your ear produces a vibration.

• the stones produce vibrations.

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Which of these statements is correct?

• Sound is produced only by metals.

• Sound can be produced without any object.

• All sounds are produced due to vibrations.

• All sounds are produced due to the heat inside the material.

Tags

NGSS.MS-PS4-1

Look at the picture. Ron strikes one end of the ruler while keeping the other end fixed on the table. What is the correct explanation for the sound he hears?

• The sound inside the ruler comes out.

• The sound is produced as it is a solid.

• The energy inside the ruler changes to sound.

• The back and forth motion of the ruler produces sound.

Tags

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Timmy puts a toy boat into the river and the toy boat is carried downstream by the ___________.

• wind

• gravity

• friction

• water current

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What would be the BEST way to make a sailboat stop moving?

• Lower all the sails.

• Make the sails tighter.

• Turn the sailboat into the direction of the wind.

• Lower the sails half-way so that they are not as tight.

The picture shows a dandelion flower and the seeds (white) that it produces. How are the seeds of a dandelion most likely transferred to a different location?

• The wind distributes them.

• The bee carries them to a different location.

• When it rains they are washed off and flow in the water.

• They stick to your clothing and you carry them to another location.

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