1) Close your eyes. What sounds do you hear? You might hear people talking. You might hear a flag flapping or a car honking. If you listen closely, you can hear many different sounds. Which animal is louder?  a) the kitten b) the lion 2) Each sound you hear is a little different. Sounds can be loud or soft. A roaring lion is louder than a crying kitten. Sounds can be high or low. A flute has a higher sound than a trumpet. Which instrument has a lower sound? a) the flute b) the trumpet 3) Which animal is the quietest? a) the bear b) the hummingbird 4) Making Sound. Hold your hand to your throat and hum. Do you feel your throat moving? Your throat vibrates when you hum. It moves back and forth quickly. When objects vibrate, they make sound. What causes things to make sound? a) vibration b) light c) food 5) Pluck a guitar string. You can see it vibrate. You hear the sound. Now put your finger on the string. The string stops vibrating. The sound stops. What causes the sound of the string to stop? a) looking at the string b) telling the string to stop vibrating c) putting a finger on the string 6) Objects vibrate in different ways. Blow into a recorder. The air inside vibrates and makes a sound. If you beat a drum, what do you think vibrates?  a) the top of the drum vibrates b) the bottom of the drum vibrates 7) Chose the object that can vibrate. a) b) c) 8) 3. Making Objects Vibrate. An airplane is loud. Windows in your house may rattle when a plane flies by. What makes the windows rattle? a) the wind from the airplane's wings b) the vibration from the airplane's sound 9) Sound moves through the air from the plane to the window. The sound makes the windows vibrate. Hold a piece of paper near an instrument. Play some music. What happens? The piece of paper vibrates. Sound can make objects vibrate. What can make object vibrate? a) sound b) wind 10) If you hold a piece of paper close to your mouth while singing, the piece of paper vibrates. What makes the paper vibrate? a) your lips b) your breath c) the smell d) the sound 11) Summary. Sound is made when objects vibrate. Sound can make other objects vibrate, too. What is made when things vibrate? a) light b) sound c) plants

TCI Science Gr1: U2-L4

由
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？