Vocabulary - Toys In Space

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Vocabulary
STUDENT RESOURCE 5.1
INFORMATION SHEET
free fall appearance of weightlessness
Newton’s third law of motion For
that happens when an object is affected
every action, there is an equal and
by only one force, gravity
opposite reaction.
Objects in orbit are in free fall. All
If you push an object, it pushes back
objects in the space shuttle, including
with equal force. In the space shuttle,
the astronauts, are falling at the same
when an astronaut throws an object,
rate. Thus, they seem to fl oat. Gravity
the object pushes back on the astronaut.
still pulls on objects in free fall. If it did
This sends the astronaut backwards with
not, they would not stay in orbit.
a force equal to the throw.
Newton’s fi rst law of motion An object
will stay at rest or continue moving in a
straight line at a constant speed unless a
force acts on it.
The tendency of an object to remain
at rest or to continue moving is known
as inertia. Objects with more mass have
greater inertia than objects with less
mass.
EXPLORING SPACE • SECTION 5 TOYS IN SPACE •

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