CHAPTER 3 NEWTON’S LAWS – DLP 1
NEWTON’S LAWS OF MOTION CHART
PRINCIPLE:
PRINCIPLE:
Any object at rest or constant velocity F=ma
(in a straight line), will REMAIN at
Net Force = (mass) x (acceleration)
rest or constant velocity (in a straight
line), unless acted upon by an outside
IF all the force vectors DO NOT
(resultant, net, or unbalanced) force.
cancel each other out, then there is a
resultant, net, or unbalanced force
REMAIN = INERTIA the tendency of
on the object (mass)
an object to keep doing what it is already
doing  at rest or constant velocity
Add all the force vectors = resultant,
net, or unbalanced force vector on
INERTIA is not a force… it is what
the object (mass)
happens if you do NOT apply a force
(Net Force)/mass = acceleration
INERTIA has units of kg… the greater
The direction of this net force IS
the mass, the greater the force is needed
THE DIRECTION of the acceleration
to CHANGE its motion
Force = mass x acceleration
1 Newton = 1 kg x 1m/s2 = 1kgm/s2
If a force accelerates a 1.00 kg mass
at 1.00 m/s2, we define this force as
1.00 Newtons = 1.00 N
WEIGHT
FORCES:
When an object is at rest or constant
velocity… ALL the forces are in
EQUILIBRIUM: F=0… even the
components: FX=0, FY=0
FORCES:
If the forces are not in equilibrium,
then you have an unbalanced, OR
resultant or net force vector
 

F1  F2  F3  ...  FR
All the forces are balanced, there is no
resultant force (when you add up their
vector forces), there is no net force (as
Newton called it) on the object (mass).
The direction of the net force = the
direction of the acceleration
MOTION:
MOTION:
1) Constant Velocity (st. line)
1) Accelerating: +a
2) At Rest
2) Decelerating: -a
ALL the forces on this object are in
EQUILIBRIUM or all their vectors
add up to 0
IF the net force is in the same
direction that the object is moving,
then the object accelerates (+a)… if
the net force is in the opposite
direction that the object is moving,
then the object decelerates (-a)
PRINCIPLE:
For every action,
there is an equal
and opposite
reaction.
Action = Force
Reaction = Force
Force = push or
pull
It is
IMPOSSIBLE to
apply a force on an
object, that it does
not apply an equal
and opposite force
on the object
pushing or pulling
on it
FRICTION
FORCES:
EVERY applied
force comes in an
action/reaction
PAIR
FME   FYOU
No action/reaction
pair may occur on
the same object
MOTION:
EACH OBJECT
MAY ONLY
FEEL ONE
ACTION OR
REACTION
FORCE!! A/R
PAIRS CAN
NEVER BE
FELT BY THE
SAME OBJECT!
NEWTONIAN TERMS
INERTIA
FRICTION
FORCE
NET FORCE
RESULTANT FORCE
NORMAL FORCE
FRICTIONAL FORCE
APPLIED FORCE
GRAVITY FORCE
CONTACT FORCES
WEIGHT
POUND
NEWTON
GRAVITY
KILOGRAM
ACCELERATION
MASS
EQUILIBRIUM