# Inertia Motion Force, Mass, Acceleration Action and Reaction

advertisement ```Inertia
Inertia is a
resistance to
change in motion.
A force is
required to
overcome an
object’s inertia.
An object at rest
will stay at rest
and an object in
motion will stay
in motion, in a
straight line at a
constant velocity,
unless acted upon
by an outside
force.
Motion
The faster an
object moves,
the less time it
takes to move a
distance.
The greater the
distance an
object travels,
the more time
that is required
to get there.
The steeper a
ramp, the faster
an object moves.
Force, Mass,
Acceleration
Action and
Reaction
Friction and
Gravity
Energy and
Momentum
Constant force
causes constant
acceleration.
For every object
there is an equal
and opposite
reaction force.
Friction is a
force that moves
against an
object’s motion.
Momentum =
mass X velocity
If there is no
force, the
velocity of an
object remains
constant.
Action-reaction
forces do not
cancel.
Friction causes
objects on Earth
to eventually
come to a stop.
Action-reaction
pairs act on 2
different
objects.
Gravity is a
center-seeking
force between
objects.
The acceleration
of an object is
directly
proportional to
its force and
inversely
proportional to
its mass.
F=MxA
The results of
action-reaction
pairs may or may
not cause motion,
depending upon
the mass of the
objects involved.
Gravity
accelerates all
objects at about
10 m/s&sup2;.
Energy cannot be
created or
destroyed; it can
only be changed
from one for to
another.
Kinetic energy is
“moving energy.”
Potential energy
is “stored
energy.”
```