B. Complete the paragraph with the correct words to complete the thought. Choose
your answer from the words below and write them on the blank.
balanced forces
mass
force
speed
unbalanced forces
inertia
size
direction
motion
to move
A/An (1)
cannot be seen but its effect can be seen or felt. If you
push on something or pull on it, then you are applying a force to it. Force makes
things move or more accurately, makes things change their (2)
(3)
are equal in the size and opposite in direction. When forces
are balanced, there is no change in motion. However, if something starts to move, it
must be because (4)
are acting on it.
To have unbalanced forces means that the force applied in one direction is
greater than the force applied to the opposite direction. When unbalanced forces
are acting on an object, there is a change in (5)
and/or
(6)
Force can affect the (7)
of an object once it is
applied. Also force causes stationary objects (8)
and moving
objects to stop and change direction, depending on the strength of the force. The
tendency of an objects not to move unless a force act on it is called
(9)
It is a property of all things which make them resistant to
an object has
change in motion. in fact, the more (10)
the more inertia it has.

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