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T/f : the sounds made by whales travel long distances because there are few obstacles in its path. los sonidos que emiten las ballenas recorren largas distancias porque hay pocos obstáculos en su camino.
True
A ____ occurs when a sound hits a distant obstacle.
Echo
T/f: sounds travel faster in liquids than in gases
True
T/f: sounds travel slower in solids than liquids
False
Sound needs a _____ to travel
Meduim
Sound travels in a ______line.
Straight
T/f : a loud sound is more intense
True
When we speak or sing we use our _____ _____
Vocal cords
T/f : people cannot hear ultrasound
True
______ is the highest pitch that exists
Ultrasound
The pitch of a sound depends on the _____(6)
Speed
Volume is measured in ______
Decibels (dB)
When we sing we use our _____ _______
Vocal cords
T/f: When an object vibrates it makes big movements very slowly
False: it makes SMALL movements very QUICKLY
To make an object move you have to ____?
Put force on it
____ is the force that slows down and stops a moving object when it is in contact with another object.
Friction
T/f: An object at rest can move without a force. (59)
False
Rigid objects ______(58)
Break
T/f: objects that break do not change their shape.
True
Clay is an example of a _______ object
Plastic
______ _______ do not return to their initial shape.
Plastic objects
______ ______ go back to their initial shape when a force stops acting upon them.
Elastic objects
T/f : not all objects respond to force the same way.
True
T/f: forces can break objects
True
T/f: forces can’t make objects change shape
False
When we push or pull something, or pick up an object up from the ground we are using _______(58)
Force


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