Transcript Newton`s Laws of Motion

NEWTON’S LAWS OF
MOTION
NEWTON’S LAWS BASED ON FORCES
Newton stated:
 Forces exist in pairs (its impossible for a single
force to act on an object)
 Forces arise as a result of actions / reactions
between objects
 There are always forces acting on all objects
 Object’s motion based on whether forces are
balanced (in equilibrium) or unbalanced
**Forces balance each other out…they do NOT
CANCEL each other out**
GENERAL CHARACTERISTICS OF FORCES
General Characteristics:
They are vectors
 Push or Pull
 Units = Newtons, Dynes, Pounds
Newton = force required to accelerate
1 kg at a rate of 1 m/s²

** There are 4 fundamental forces**
TYPES & CLASSIFICATIONS OF FORCES
1.
2.
3.
4.
a.
b.
c.
Types
Gravitational – weakest of all forces
Electromagnetic – force involved when you push
or pull an object
Strong Nuclear Force – strongest of all forces
Weak Nuclear Force – involved in radioactive
decay
Classifications
Contact Force- ex. = frictional, tensional, applied
Long Range- ex. = gravity, thrust
Short Range- ex. = strong nuclear / weak nuclear
FORCES FOUND IN THE FOLLOWING PAIRS
Ff
FN
Fg
Fapp
When balanced:
FN = Fg Normal force = Gravitational force
Ff = Fapp Frictional force = Applied force
Force of Gravity = mass x gravity (neg. = direction)
Normal Force = mass x gravity (positive)
Frictional Force = μ x FN
(μ = coefficient of friction)
NEWTON’S 1ST LAW OF MOTION
 Law
#1 = Objects at rest stay at rest,
objects in motion stay in motion (unless
acted on by an outside force).

Important term “Inertia” = the tendency to
resist change
 Whiplash
 Pushing a heavy object starting at rest
 Stopping a semi-truck
NEWTON’S 2ND LAW OF MOTION
 Law
#2 = When a force acts on an object,
the resulting acceleration is directly
proportional to the force and inversely
proportional to the mass.
F=mxa
NEWTON’S 3RD LAW OF MOTION
 Law
#3 = For every action, there is an
equal & opposite reaction