Unit 2 Mid-Unit Test

Which of the following can sound travel through?

• Solid

• Liquid

• Gas

• All the above

Many animals make sounds to communicate with each other.

• True

• False

To vibrate means to ___________________.

• move back and forth slowly

• move back and forth quickly

• move up and down slowly

How can sound travel through air?

• Through open spaces

• Through air particles bumping into each other

• Through electronically charged particles

• It doesn't travel; it just exists

Sound is caused by? 

• force
• vibrations
• instruments

What makes things happen?

• matter
• computers
• energy
• density

In science, when one object runs into another we call it a _____________.

• crash
• hit
• strike
• collision

The fourth graders are playing kickball at PE. One student rolled a ball to a second student. As the ball rolls towards the second student, he kicks it. Which of these will change after the ball leaves his foot? Select all that apply.

• A. position

• B. speed

• C. mass

• D. direction

A tennis player hits a tennis ball with his racket. Which of these is NOT likely to happen to the tennis ball after it is struck by the racket?

• A. The ball could bounce off the racket and continue moving behind the tennis player.

• B. The ball could stay with the racket.

• C. The ball could pop straight up in the air.

• D. The ball could move forward and away from the tennis player.

The letter a on the image above is represent for .........

• Wavelength

• Amplitude

• Frequency

• Speed