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________ is a force that slows things down when two things rub against each other.
A _________ is a substance (normally a liquid) used to reduce friction.
Air __________ is a force that tries to slow things that are moving through the air.
The _______ of an object is worked out by finding its mass and dividing by its volume.
The ____ is the amount of matter that something is made of.
The ______ is the amount of room something takes up.
Two forces working in opposite directions that are not the same strength are said to be __________.
All __________ (still) objects have balanced forces on them.
Any substance that will return to its original shape and size after it has been stretched is said to be _______.
The _____ of an object is how fast it is moving.