Warm Up 4-7
Complete the table below in your notebook:
Subatomic
Particle
Proton
Charge
Location in
Atom
Relative Size
The 4 Fundamental Forces of Nature
1) Gravitational
2) Electromagnetic
3) Strong Nuclear
4) Weak Nuclear
Which do you think is the strongest?
Which do you think is the weakest?
1) Gravitational
2) Electromagnetic
3) Strong Nuclear
4) Weak Nuclear
Gravitational Force
The Gravitational Force is the attractive force
between any (and all) objects with mass
It can only
attract
It is the weakest
force!
Electromagnetic Force
The Electromagnetic Force is the attractive or
repulsive force between electric charges or
magnets
It is the only
force that can
attract or repel
This is the force that attracts
electrons to protons
Strong Nuclear Force
The Strong Nuclear Force is the force that holds
together the nucleus of an atom (protons and
neutrons)
It can only
attract
It is the strongest
force!
Weak Nuclear Force
The Weak Nuclear Force is the force that is
responsible for beta decay (radiation).
It can only
attract
Basically, this force holds together the tiny particles that
make up protons. Once the force is overcome (by a
collision), a proton turns into a neutron and releases
radiation in the process.
Tiny Definitions
1)
2)
3)
4)
Gravitational – Mass
Electromagnetic – Charge/Magnet
Strong Nuclear – Nucleus
Weak Nuclear - Radiation
Chickity-Check Yo Self!
Which of the 4 fundamental
forces is the weakest?
Gravitational!
Chickity-Check Yo Self!
Which of the 4 fundamental
forces can attract?
All four!
Chickity-Check Yo Self!
Which of the 4 fundamental
forces is the strongest?
Strong Nuclear Force!
Chickity-Check Yo Self!
Which of the 4 fundamental
forces can repel?
Electromagnetic!
Chickity-Check Yo Self!
Which of the 4 fundamental forces is
responsible for chemical bonding?
Electromagnetic!
Chickity-Check Yo Self!
Which of the 4 fundamental
forces is involved with
radiation?
Weak Nuclear Force
Coulomb’s Law
Coulomb’s Law
Coulomb’s Law will tell you the force
of an electrical attraction or repulsion.
Charges will attract if they
are opposites and repel if
they are the same
Felectrical =
k q1 q2
2
d
Felectrical = electrical force (in N)
k = Coulomb’s constant = 9.0 x 109 (in
Nm2
)
2
C
q1 = charge of particle 1 (in C, Coulombs)
q2 = charge of particle 2 (in C, Coulombs)
d = distance between particles (in m)
Why Fallout 4 is Awesome
Felectrical =
k q1 q2
2
d
Felectrical = electrical force (in N)
k = Coulomb’s constant = 9.0 x 109 (in
Nm2
)
2
C
q1 = charge of particle 1 (in C, Coulombs)
q2 = charge of particle 2 (in C, Coulombs)
d = distance between particles (in m)
Felectrical =
k q1 q2
2
d
Does this equation look like anything
we’ve seen before?
Fgravity =
G m1 m2
d2
EXAMPLE
A particle with a charge of 2.0x10-6 C and a
particle with a charge of 4.0x10-6 C are 3.0x10-2m
apart. How strong is the electrical force between
them?
EXAMPLE
A particle with a charge of -1.5x10-6 C is 2.1x10-2m
from a particle with a 5.2x10-6 C charge. How
strong is the electrical force between them?
PRACTICE
A particle with a charge of 2.2x10-6 C is 1.0x10-2m
from a particle with a 3.0x10-6 C charge. How
strong is the electrical repulsion between them?