QW 3-2-15 Answer The Following On A NEW Sheet of Paper… 1. Define gravity. 2. T or F. A substance...
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QW 3-2-15 Answer The Following On A NEW Sheet of Paper… 1. Define gravity. 2. T or F. A substance with a high specific heat takes a long time to heat up
QW 3-2-15 Answer The Following On A NEW Sheet of Paper 1.
Define gravity. 2. T or F. A substance with a high specific heat
takes a long time to heat up. 3. What is the difference between
thermal energy and temperature? 4. What is a force? 5. T or F.
Energy always flows naturally from cold to hot.
Slide 2
Slide 3
What is a force? A force is a push or a pull. If something is
not moving, a push or pull could start it moving. If something is
moving, a push or pull could stop it.
Slide 4
Four Fundamental Forces Of Nature Listed From Weakest To
Strongest: 1. Gravitational Force 2. Weak Nuclear Force 3.
Electromagnetic Force 4. Strong Nuclear Force
Slide 5
Gravitational Force What do you remember about gravity?
Slide 6
Gravitational Force Right now, youre being pulled down by
Gravity. With an acceleration of 9.8 m/s 2 We feel gravity almost
all the time (not when were in outer space, but its still there),
but its most obvious when stuff falls down.
Slide 7
History Of Gravity Galileo discovered that all objects fall at
the same rate Scientists proved this on the moon with a feather and
a hammer https://www.youtube.com/watch?v=5C5_dOEyAfk
Slide 8
Newtons Laws of Gravity Extension of Galileo`s work All matter
has gravity Gravity pulls The more mass, the more gravity The
farther away, the less gravity
Slide 9
Gravitational force is a fundamental force that acts between
any objects with mass Nobody knows why matter has gravity, but we
do know exactly how it behaves. We think it behaves the same
everywhere in the universe. Therefore, it is a Fundamental
Force.
Slide 10
Weak Nuclear Force Weak nuclear force is stronger than
gravitational force but acts over a very short distance range
Responsible for decay of atoms causing radiation Beta decay is when
a neutron splits into a proton and electron This creates
radioactivity
Slide 11
Importance Of Weak Nuclear Force If the weak force were not to
exist, many types of matter would become much more stable. Elements
like plutonium and uranium could be handled without protection.
Without the weak force, the sun would cease to exist. The weak
force allows the fusion of protons and neutrons within the sun. The
excess energy from this fusion is the sun`s source of heat!
Slide 12
Electromagnetism What familiar words make up
Electromagnetism?
Slide 13
Electromagnetism is in anything that has a charge Your hair
Electric currents Magnets The ink sticking to your notebook paper
The paint sticking to the wall Car batteries Electrons/protons
within atoms
Slide 14
History of Electromagnetism
Slide 15
Electromagnetism is a fundamental force that exists between
anything that has a charge (positive vs negative) Electromagnetism
is a stronger fundamental force than gravity but it also has long
range effects We will be discussing electricity and magnetism in
greater detail within the coming weeks
Slide 16
Strong Nuclear Force This is the strongest of the fundamental
forces The strong nuclear force is responsible for: 1. Holding the
nucleus of atoms together against the repulsive force of protons
2.Helping to form subatomic particles such as protons and neutrons
This force is strong but only acts over VERY small distances
Slide 17
CERN Super Collider Scientists use the CERN super collider to
find new types of particles or building blocks of life Higgs Boson
Particle https://www.youtube.com/ watch?v=W4LZRLdyQl4
https://www.youtube.com/ watch?v=W4LZRLdyQl4
http://www.history.com/shows/t he-universe/videos/the-large-
hadron-collider http://www.history.com/shows/t
he-universe/videos/the-large- hadron-collider
Slide 18
Grand Unified Theory (GUT) After Einstein discovered relativity
and all that stuff, he spent the remaining 30 years of his life
trying to figure out how these four forces fit together. Scientists
are still trying to achieve this discovery.
Slide 19
Fundamental Forces in Physics Listed By Increasing Strength:
Gravitational Force Attractive force between objects with mass Long
range effects Weak Nuclear Force Cause neutrons to decade into a
protons Short range effects 10 28 times stronger than gravity
Electromagnetic Force Attractive and repulsive Long range effects
10 39 times stronger than gravity Strong Nuclear Force Hold the
entire nucleus together Short range effects 10 41 times stronger
than gravity
Slide 20
Remember: GWES G ravitational, W eak Nuclear, E lectromagnetic,
S trong Nuclear are the Four Fundamental Forces in order of
increasing strength
Slide 21
https://www.youtube.com/watch?v=R9FVFh3HYaY 4 Fundamental
Forces Video Summary