Unit 8.2 Quiz 1

What is a scientific model? Pick the one best response.

• Something 3-dimensional to represent something else.

• A picture of something with explanations.

• An idea about how things work, like a theory.

• A physical, mental, or mathematical model.

Answer explanation

A scientific model can be physical, mental, or mathematical, representing concepts or systems. This definition encompasses various forms of models, making it the best choice compared to the other options.

Tags

NGSS.MS-LS1-2

NGSS.MS-PS1-1

NGSS.MS-PS3-2

What causes sound?

• air

• amplitude

• vibrations

• frequency

Answer explanation

Sound is caused by vibrations, which create pressure waves in the air. These vibrations can come from various sources, such as musical instruments or vocal cords, and are essential for producing sound.

All sounds start as:

• noises

• music

• contact forces

• moving objects

Answer explanation

All sounds originate from contact forces, which cause vibrations in objects. These vibrations travel through a medium, creating sound waves that we perceive as sound.

Tags

NGSS.MS-PS4-1

In Lesson 1, we saw that the sound coming from the speaker in the truck could:

• create light that reflects from the windows.

• make the windows stop vibrating/shaking.

• only be heard and felt inside of the truck.

• make the windows of the building vibrate/shake.

Answer explanation

The sound from the truck's speaker can create vibrations in the air, which can cause the windows of nearby buildings to vibrate or shake. This is a common phenomenon with loud sounds, making this the correct choice.

Tags

NGSS.MS-PS4-2

What would we observe when a sound source makes a sound?

• We will see the sound waves leaving the source.

• We will see the sound source vibrating.

• We will see the sound source changing colors.

• We will see the sound source being pushed.

Answer explanation

When a sound source makes a sound, we observe the sound source vibrating. This vibration creates sound waves, which is how sound travels, but we cannot see the waves themselves.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Sound is produced by:

• moving air.

• turning up the volume.

• rotation.

• vibration.

Answer explanation

Sound is produced by vibration, which occurs when an object moves back and forth rapidly, creating pressure waves in the air. This is the fundamental mechanism behind sound production, unlike the other options listed.

When a force is applied to an object, such as an instrument, __________ is transferred.

• energy

• vibration

• sound

• force

Answer explanation

When a force is applied to an object, it causes a transfer of energy. This energy can manifest as movement, vibration, or sound, but the fundamental concept is that energy is what is transferred when force is applied.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

In Lesson 2, we passed around four different instruments and watched them in slow motion. What did all of these sound sources have in common?

• They all sounded the same.

• They were all the same shape.

• They all store sound.

• They all had to be struck in some way to make sounds.

Answer explanation

All the instruments had to be struck to produce sound, which is a common characteristic of percussion instruments. This distinguishes them from other types of sound sources that may not require striking.