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Some objects can change shape when a ____ acts upon them.
force
What is the force that slows down and stops a moving object when it is in contact with another object?
friction
When an object moves against air or water it is called
resistance
When a sound hits a distant obstacle and the sound is reflected back to our ears
echo
Types of object that can break
rigid
The unit used to measure volume
Decibels
The quality of sound that allows us to identify its source
timbre
What part of our body do we use to speak and sing?
vocal cords
How is sound made?
with vibrations
Why is it harder to walk in water?
because of resistance
The volume of a sound
intensity
The pitch of a sound allows us to tell the difference between _____ and _____ sounds.
high and low
What is it called when there is so much noise that it affects our hearing?
noise pollution
Does sound travel faster in liquids or solids?
solids
If an object is moving, it will continue moving until what happens?
Until a force makes it stop or change direction.
