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Forces and Sound
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The ______ allows you to identify different voices.
timbre
A _______ is a unit that measures the intensity of sound.
decibel
The volume of a sound is the ______.
intensity
Friction and ______ are forces that slow down moving objects.
resistance
Forces can also make objects start or stop moving, or change speed or ______.
direction
_______ objects break when sufficient force acts on them.
rigid
A level of noise that affects our hearing. It can be bad for our mental and physical health.
 
Noise Pollution
 
Speed of Sound
 
Echo
 
Reverberation
This occurs when a sound is reflected by a nearby obstacle. The sound returns quickly to our ears and they overlap.
 
Reverberation
 
Speed of Sound
 
Echo
 
Noise Pollution
This occurs when a sound hits a distant obstacle. The sound is reflected and returns to our ears.
 
Echo
 
Speed of Sound
 
Reverberation
 
Noise Pollution
It is the quality of a sound that allows us to identify its source.
 
Timbre
 
Intensity
 
Decibels
 
Pitch
It allows us to differentiate between high and low sounds.
 
pitch
 
Intensity
 
Decibels
 
Timbre
Volume is measured in:
 
Decibels
 
Intensity
 
Pitch
 
Timbre
The volume of a sound.
 
Intensity
 
Decibels
 
Pitch
 
Timbre
When we speak, the air from our lungs makes our _____ vibrate as it passes through our throat.
 
vocal cords
 
friction
 
vibration
 
sound
Movements transmitted through the air that reach our ears and are transformed into electrical impulses inside the ear.
 
vibration
 
friction
 
water resistance
 
vocal cords
When our brain receives vibrations and our brain interprets them:
 
sound
 
friction
 
water resistance
 
vibrations
a bird flying in the sky
 
air resistance
 
friction
 
water resistance
a car traveling on a road
 
friction
 
air resistance
 
water resistance
A fish swimming in a pond
 
water resistance
 
air resistance
 
friction
An object will slow down until it stops because of:
 
friction
 
air resistance
 
water resistance
They break if sufficient force acts upon them.
 
rigid objects
 
elastic objects
 
plastic objects
They do not return to their initial shape when a force stops acting upon them.
 
plastic objects
 
elastic objects
 
rigid objects
They go back to their initial shape when a force stops acting upon them.
 
elastic objects
 
plastic objects
 
rigid objects
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